CENTER DRILLS

Solid Carbide Center Drills for Precision Hole Positioning.

D9100-Series

NC Center Drill Design Highlights

Solid Carbide Construction
Oerlikon AITiN Coating Technology
90° and 120° Point Angle Design
Cutting Edge Preparation
Optimized Flute Geometry
Reinforced Core Design

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Center Drill Types

60° D9100-Series NC Center Drills-SCD2F60-BZ

60° 2-Flute Center Drills for Steel (Nano-Bronze)

Suitable for high-precision spotting and centering with Nano-Bronze coatings.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BZ: Bronze
2 Flutes
External Coolant Design
DIN 6535-HA
Straight Shank
Drilling
Right-Hand Cutting
60° Point Angle
Solid Carbide Construction

60° D9100-Series NC Center Drills-SCD2F60-BE

60° 2-Flute Center Drills for Steel (Nano-Blue)

Designed for accurate centering in steel parts, featuring the Nano-Blue coatings for heat and wear resistance.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BE: Blue
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
60° Point Angle
Solid Carbide Construction
M7

60° D9100-Series NC Center Drills-SCD2F60-HB

60° 2-Flute Center Drills for Aluminum (Uncoated)

Specialized for centering in aluminum to deliver superior surface finishes without burr formation.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
60° Point Angle
Solid Carbide Construction
M7

60° of D9100-Series NC Center Drills-SCD2F60-RB

60° 2-Flute Center Drills for Aluminum (DLC)

Optimized for smooth aluminum machining with high-performance DLC coatings to decrease chip adhesion.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
Oerlikon DLC Coating
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
60° Point Angle
Solid Carbide Construction
M7

90° D9100-Series NC Center Drills-SCD2F90-BZ

90° 2-Flute Center Drills for Steel (Nano-Bronze)

Designed for accurate 90° spotting and chamfering with Nano-Bronze coatings, decreasing the tool wear.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BZ: Bronze
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
90° Point Angle
Solid Carbide Construction
M7

90° D9100-Series NC Center Drills-SCD2F90-BE

90° 2-Flute Center Drills for Steel (Nano-Blue)

Suitable for 90° center drilling in steel with Nano-Blue coatings, delivering high thermal stability.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BE: Blue
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
90° Point Angle
Solid Carbide Construction
M7

90° D9100-Series NC Center Drills-SCD2F90-BK

90° 2-Flute Center Drills for Steel (Nano-Black)

Suitable for heavy-duty steel machining with Nano-Black coatings, featuring unmatched hardness and durability.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BK: Black
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
90° Point Angle
Solid Carbide Construction
M7

90° D9100-Series NC Center Drills-SCD2F90-HB

90° 2-Flute Center Drills for Aluminum (Uncoated)

Optimized for precision 90° spotting with edge sharpness and clean surfaces.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
90° Point Angle
Solid Carbide Construction
M7

90° D9100-Series NC Center Drills-SCD2F90-RB

90° 2-Flute Center Drills for Aluminum (DLC)

Minimal built-up edge can be achieved with smooth chip evacuation and surface finishes in aluminum machining.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
Oerlikon DLC coating
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
90° Point Angle
Solid Carbide Construction
M7

120° D9100-Series NC Center Drills-SCD2F120-BZ

120° 2-Flute Center Drills for Steel (Nano-Bronze)

Provides accurate 120° centering in steel parts, designed with Nano-Bronze coatings for heat and wear resistance.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BZ: Bronze
2 Flutes
External Coolant Design
DIN 6535-HA
Straight Shank
Drilling
Right-Hand Cutting
120° Point Angle
Solid Carbide Construction
M7

120° D9100-Series NC Center Drills-SCD2F120-BE

120° 2-Flute Center Drills for Steel (Nano-Blue)

Engineered for 120° spotting in steel with Nano-Blue coatings, promoting the cutting consistency.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
BE: Blue
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
120° Point Angle
Solid Carbide Construction
M7

120° D9100-Series NC Center Drills-SCD2F120-HB

120° 2-Flute Center Drills for Aluminum (Uncoated)

Engineered for accurate 120° center drilling in aluminum with clean cuts and superior chip flow.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
120° Point Angle
Solid Carbide Construction
M7

120° D9100-Series NC Center Drills-SCD2F120-RB

120° 2-Flute Center Drills for Aluminum (DLC)

Optimized for aluminum center drilling with high-performance DLC coatings, enabling their minimal tool friction and chip adhesion.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
S: Superalloy
Oerlikon DLC coating
2 Flutes
Drilling
External Coolant Design
DIN 6535-HA
Straight Shank
Right-Hand Cutting
120° Point Angle
Solid Carbide Construction
M7

D9100-Series

Why Choose Our NC Center Drills?

JINOO’s D9100-Series solid carbide center drills feature a unique geometry design, promoting the creation of more accurate holes with higher machining efficiency.

Fine-Grain Carbide Substrate

Our center drills are all manufactured from ultra-fine grain carbide substrates with uniform structure and uniform grain distribution.

Oerlikon AlTiN Coating Technology

Oerlikon AlTiN coatings feature even coating thickness and strong adhesion to improve drill bit performance.

90° and 120° Point Angle Design

90° and 120° point angles are available in center drill types to suit centering and positioning needs.

Cutting Edge Preparation

Micro-honed cutting edges of center drills are designed with a controllable edge radius and improved edge integrity.

Optimized Flute Geometry

Center drills are engineered with optimized flutes, which feature superior profiles and precisely-ground surfaces.

Reinforced Core Design

The reinforced core geometry is designed with a higher core thickness and a rigid structure.

Center Drill Geometry Breakdown

1.Fine-Grain Carbide Substrate for Higher Rigidity

Our solid carbide center drill bits are manufactured from 0.2μm fine-grain carbide, enabling higher tool rigidity and wear resistance in precision spotting.

2.AlTiN Coatings for High Heat Resistance

Combined with advanced Oerlikon AITiN coatings, center drills can enhance heat resistance up to 900°C, especially when they are used for spotting in stainless steel.

3. 90° and 120° Point Angles for Positional Accuracy

Specialized 90° and 120° drill point angles can deliver stable tool engagement and precise hole positioning with the accurate pilot seat.

4. Precise Edge Preparation for Edge Integrity

Micro-honed cutting edges can uniformly distribute cutting loads and minimize edge chipping with the controlled edge radius.

5. Optimized Flute Geometry for Efficient Chip Flow

Precision-ground flutes can promote efficient chip evacuation and greatly decrease heat generation.

6. Reinforced Core Design for Higher Strength

Increased web thickness greatly improves torsional rigidity with bending resistance to minimize tool vibration.

7. Balanced Helix Angles for Superior Chip Control

Balanced helix angles are typically between 20° and 30° to balance edge strength and sharpness, improving the control of chip flow.

8. Shortened Chisel Edge for Less Thrust Force

The short chisel edge design can decrease the extrusion zone to reduce thrust force, enhancing centering accuracy with smooth entry.

9. Precisely-Ground Relief Angle for Less Friction

Precision-ground relief angle can minimize flank contact with sufficient edge support, decreasing the tool friction and improving dimensional accuracy.

Geometry Breakdown of D9100-Series NC Center Drills

Technical Data

Ultra-fine Grain Substrate	0.2μm / 0.4μm / 0.6μm
Tolerance	H6
Coating	AlTiN + TiSiN / TiAlSiN-X / AlTiN / TiAlN / TiAlSiN / DLC / AlCrN / AlCrSiN / AlTiSiN / TiSiXN / Customized Available
Flute Number	2
Overall Length	50 / 60 / 75 / 100 / 150 / 200mm / Customized Length
Shank Diameter	4 / 6 / 8 / 10 / 12 / 14 / 16/ 18 / 20mm / Customized Diameter

D9100-Series

Center Drill Specifications

Custom Center Drill Size Size Range
Carbide Substrate
Quick Selection Guide
Recommended Cutting Parameters

Code		Diameter (mm)	Diameter (in)	Shank Diameter (in)	Overal Length OAL(in)	Flute Length (in)	Shank Length (in)
Code (90°)	Code (120°)	Diameter (mm)	Diameter (in)	Shank Diameter (in)	Overal Length OAL(in)	Flute Length (in)	Shank Length (in)
D9100-090-D03175	D9100-120-D03175	3.175	0.125	6	62	20	14
D9100-090-D03571	D9100-120-D03571	3.571	0.1406	6	62	20	14
D9100-090-D03970	D9100-120-D03970	3.97	0.1563	6	66	24	17
D9100-090-D04366	D9100-120-D04366	4.366	0.1719	6	66	24	17
D9100-090-D04763	D9100-120-D04763	4.763	0.1875	6	66	28	20
D9100-090-D05159	D9100-120-D05159	5.159	0.2031	6	66	28	20
D9100-090-D05558	D9100-120-D05558	5.558	0.2188	6	66	28	20
D9100-090-D05949	D9100-120-D05949	5.949	0.2344	6	66	28	20
D9100-090-D06350	D9100-120-D06350	6.35	0.25	8	79	34	24
D9100-090-D06746	D9100-120-D06746	6.746	0.2656	8	79	34	24
D9100-090-D07145	D9100-120-D07145	7.145	0.2813	8	79	41	29
D9100-090-D07541	D9100-120-D07541	7.541	0.2969	8	79	41	29
D9100-090-D07938	D9100-120-D07938	7.938	0.3125	8	79	41	29
D9100-090-D08344	D9100-120-D08344	8.334	0.3281	10	89	47	35
D9100-090-D08733	D9100-120-D08733	8.733	0.3438	10	89	47	35
D9100-090-D09129	D9100-120-D09129	9.129	0.3594	10	89	47	35
D9100-090-D09525	D9100-120-D09525	9.525	0.375	10	89	47	35
D9100-090-D09921	D9100-120-D09921	9.921	0.3906	10	89	47	35
D9100-090-D10320	D9100-120-D10320	10.32	0.4063	12	102	55	40
D9100-090-D10716	D9100-120-D10716	10.716	0.4219	12	102	55	40
D9100-090-D11111	D9100-120-D11111	11.111	0.4375	12	102	55	40
D9100-090-D11509	D9100-120-D11509	11.509	0.4531	12	102	55	40
D9100-090-D11908	D9100-120-D11908	11.908	0.4688	12	102	55	40
D9100-090-D12300	D9100-120-D12300	12.3	0.4843	14	107	60	43
D9100-090-D12700	D9100-120-D12700	12.7	0.5	14	107	60	43
D9100-090-D13100	D9100-120-D13100	13.1	0.5157	14	107	60	43
D9100-090-D13891	D9100-120-D13891	13.891	0.5469	14	107	60	43
D9100-090-D14288	D9100-120-D14288	14.288	0.5625	16	115	65	45
D9100-090-D14684	D9100-120-D14684	14.684	0.5781	16	115	65	45
D9100-090-D15083	D9100-120-D15083	15.083	0.5938	16	115	65	45
D9100-090-D15479	D9100-120-D15479	15.479	0.6094	16	115	65	45
D9100-090-D15875	D9100-120-D15875	15.875	0.625	16	115	65	45
D9100-090-D17463	D9100-120-D17463	17.463	0.6875	18	123	73	51
D9100-090-D19050	D9100-120-D19050	19.05	0.75	20	131	79	55

Grain size	Feature	Suitable materials	Advantage
0.2μ	Ultra-fine grain, extremely high hardness, very sharp cutting edge	Hardened steel (HRC60+), stainless steel, titanium alloys, micro-diameter tools	Excellent wear resistance & edge sharpness, ideal for high-precision finishing, but lower toughness
0.4μ	Ultrafine grain, excellent hardness-toughness balance	hardness-toughness balance Hardened steel, stainless steel, alloy steel, precision mold steel	High wear resistance with good edge stability, suitable for finishing & semi-finishing
0.6μ	Fine grain, balanced performance	Carbon steel, alloy steel, stainless steel, cast iron (general conditions)	Good balance of wear resistance and toughness, versatile general-purpose grade
0.7μ	Medium-fine grain, improved toughness	General steel, low-alloy steel, interrupted cutting conditions	Better resistance to chipping, suitable for semi-roughing and unstable cutting
0.8μ	Medium grain, high toughness	Low carbon steel, rough machining, heavy interrupted cutting	Strong impact resistance, suitable for roughing and demanding cutting stability

Materials		Workpiece Materials	Type
ISO		Workpiece Materials	Type
P	P1	Free-Cutting Steel	D2100 / D2200 / D2300 / D2400 / D2600 / D3000 / D5200 / D9100
	P2	Low Carbon Steel（C<0.25%）
	P4	Medium Carbon Steel(0.25%<C<0.60%), Low Alloy Steel
	P5	Alloy Steel, Quenched and Tempered Steel
	P6	High Carbon Steel（C>0.6%）
	P11	Ferritic Stainless Steel, Martensitic Stainless Steel
H	H5	Quenched and Tempered Steel	D2100 / D2200 / D2300 / D2400 / D2600 / D3000
	H7	Bearing Steel
	H8	Tool Steel, High Speed Steel
	H12	Hardened Stainless Steel
	H21	Zinc-Plated Steel
M	M1	Austenitic Stainless Steel	D2100 / D2200 / D2400 / D2600 / D3000 / D5200 / D9100
	M2	High-Strength Austenitic Stainless Steel
	M4	Duplex Stainless Steel
S	S1	Iron-Based Superalloy	D2600 / D9100
	S2	Cobalt-Based Superalloy
	S3	Nickel-Based Superalloy
	S11	Titanium Alloy (Low Alloy)
	S13	Titanium Alloy (High Alloy)
K	K1	Gray Cast Iron	D2100 / D2200 / D2300 / D2400 / D3000 / D5200 / D7200 / D9100
	K2	Compacted Graphite Iron（CGI）
	K3	Malleable Cast Iron
	K4	Ductile Cast Iron
N	N1	Aluminum-Silicon Alloy,Silicon content<9%	D2500 / D2600 / D5200 / D7200 / D9100
	N2	Silicon-Aluminum Alloy,9%<Silicon content<16%
	N3	Silicon-Aluminum Alloy,Silicon content>16%
	N4	Cast Aluminum Alloy
	N5	Wrought Aluminum Alloy
	N10	Copper
	N11	Copper Alloy

Materials		Workpiece Materials	Brinell Hardness	Rockwell Hardness	Cutting Speed Vc (m/min)		Feed Per Revolution fn (mm/rev)
ISO		Workpiece Materials	HB	HRC	External Coolant	Internal Coolant	3	4	6	8	10	12	14	16	18	20
P	P1	Free-Cutting Steel	<125		100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	P2	Low Carbon Steel（C<0.25%）	<125		100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	P4	Medium Carbon Steel(0.25%<C<0.60%), Low Alloy Steel	<220	<25	100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	P5	Alloy Steel, Quenched and Tempered Steel	<330	28-35	100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	P6	High Carbon Steel（C>0.6%）	370-750	45-65	70		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	P11	Ferritic Stainless Steel, Martensitic Stainless Steel	250-450	38-50	80		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
H	H5	Quenched and Tempered Steel		35-40	70		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	H7	Bearing Steel		56-64	60		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	H8	Tool Steel, High Speed Steel		38-64	50		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	H12	Hardened Stainless Steel		33-50	60		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	H21	Zinc-Plated Steel		35-64	50		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
M	M1	Austenitic Stainless Steel	<150		50		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	M2	High-Strength Austenitic Stainless Steel	150-230		45		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	M4	Duplex Stainless Steel	135-275		30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
S	S1	Iron-Based Superalloy	160-260	25-48	30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	S2	Cobalt-Based Superalloy	250-450	25-48	30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	S3	Nickel-Based Superalloy	160-450	<48	30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	S11	Titanium Alloy (Low Alloy)	250-350	33-38	30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	S13	Titanium Alloy (High Alloy)	300-400	36-48	30		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
K	K1	Gray Cast Iron	120-290	<32	100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	K2	Compacted Graphite Iron（CGI）	120-290	<32	100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	K3	Malleable Cast Iron	130-260	<28	100		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	K4	Ductile Cast Iron	180-350	<43	90		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
N	N1	Aluminum-Silicon Alloy,Silicon content<9%	60-90		120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N2	Silicon-Aluminum Alloy,9%<Silicon content<16%	70-100		120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N3	Silicon-Aluminum Alloy,Silicon content>16%	90-150		120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N4	Cast Aluminum Alloy	60-120		120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N5	Wrought Aluminum Alloy	60-90		120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N10	Copper			120		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35
	N11	Copper Alloy	120-200		90		0.12	0.15	0.18	0.2	0.22	0.24	0.26	0.3	0.33	0.35

Center Drill Application Cases

Automotive Transmission Housing Manufacturing

Background

An automotive supplier produces alloy steel transmission housings, and high-precision hole positioning is essential before creating over 2000 mounting holes per batch to ensure consistent hole positions.

Challenge

Workpiece: Automotive Transmission Housing
Material: 42CrMo4 Alloy Steel
Hardness: 28–32 HRC
Hole Type: 90° Spot Holes and Through Holes
Hole Depth: Spotting Depth 1.2 mm
Requirement: Stable drilling performance with excellent position accuracy within ±0.03 mm.

Solution

Tool Used: Ø8 mm 90° 2-Flute Carbide Center Drills for Steel (Nano-Blue)
Coolant Type: External Coolant
Machine Tool: Brother SPEEDIO S700X1 Vertical Machining Center
Spindle Speed: 6,000 rpm
Feed Rate: 480 mm/min

Results

Excellent position accuracy can be controlled within ±0.02 mm with surface finishes of approximately Ra 0.8 μm. Compared with conventional TiAlN-coated center drills, our 90° 2-Flute Carbide Center Drills for Steel can achieve about 30% extended tool life.

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Real Case of D9100-Series NC Center Drills

How JINOO Manufactures Center Drills?

Precision CNC Grinding Machines

- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These world-class CNC grinding machines are mainly applied for delivering edge sharpness, consistent geometry, and dimensional accuracy of center drills with tight tolerances within ±0.002 mm.
Get instant Quote

Advanced Quality Inspection System

1.ZOLLER G3 Tool Measurement: Used to perform the verification of the drill geometry and critical dimensions of center drills, such as tool diameters, the point angle and concentricity.

2.PG1000 Optical Inspection: After dimensional verification, we will inspect the cutting edge preparation and tool integrity under the magnification of up to 200×, which can help identify cutting edge defects.

3.Parlec Tool Presetting: Before final shipment, we will inspect the center drill length and clamping positioning precision to control the runout within 3 μm, further ensuring the machine compatibility.

We always utilize the quality inspection system to achieve the comprehensive quality control of our center drills, ensuring their unmatched tool quality and accurate dimensions.
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1.ZOLLER G3 Tool Measurement: Used to perform the verification of the drill geometry and critical dimensions of center drills, such as tool diameters, the point angle and concentricity.

2.PG1000 Optical Inspection: After dimensional verification, we will inspect the cutting edge preparation and tool integrity under the magnification of up to 200×, which can help identify cutting edge defects.

3.Parlec Tool Presetting: Before final shipment, we will inspect the center drill length and clamping positioning precision to control the runout within 3 μm, further ensuring the machine compatibility.

We always utilize the quality inspection system to achieve the comprehensive quality control of our center drills, ensuring their unmatched tool quality and accurate dimensions.
Get instant Quote
1.ZOLLER G3 Tool Measurement: Used to perform the verification of the drill geometry and critical dimensions of center drills, such as tool diameters, the point angle and concentricity.

2.PG1000 Optical Inspection: After dimensional verification, we will inspect the cutting edge preparation and tool integrity under the magnification of up to 200×, which can help identify cutting edge defects.

3.Parlec Tool Presetting: Before final shipment, we will inspect the center drill length and clamping positioning precision to control the runout within 3 μm, further ensuring the machine compatibility.

We always utilize the quality inspection system to achieve the comprehensive quality control of our center drills, ensuring their unmatched tool quality and accurate dimensions.
Get instant Quote

Fine-grain Carbide Tool Material

1.We cooperate with well-renowned raw material suppliers such as GESAC, Kennametal, Sandvik, Gühring, and CB Ceratizit to ensure the stable supply of our carbide substrates.

2.JINOO’s center drills are all manufactured from fine-grain carbide tool material, enabling their high rigidity and wear resistance.

3.Our fine-grain carbide substrates feature the pure structure with 10% to 12% cobalt content.
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Virgin Carbide Instead of Recycled Carbide

JINOO’s virgin tungsten carbide we use in our center drills:
- Fine grains
- High structural stability
- Extended tool life
- Superior wear resistance
- Higher purity
Competitor’s recycled carbide used in poor-quality drills:
- Uneven grain size
- Many impurities
- Uneven cobalt phase distribution
- Loose structure
- Prone to tool breakage
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Reliable Coating Partners

1.JINOO’s center drills are all designed with advanced AITiN coatings from Oerlikon Balzers.

2.We can customize center drills with a wide range of coating selections to suit versatile machining applications.

3.Combined with such high-performance coating technology, our center drills can achieve excellent heat and wear resistance with longer tool life.
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High-performance Coating vs. Poor-quality Coating

High-quality coatings used in our solid carbide center drills:
- Strong adhesion
- Tight tolerances
- High density
- No pores
- Higher wear resistance
Competitor’s poor-quality coatings used in low-grade drill bits:
- Weak adhesion
- Edge buildup
- Obvious micro-cracks
- Prone to corrosion
- Large performance fluctuations
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ISO 9001 Quality Management System

- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
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- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platforms Verified Supplier
- National High-tech Enterprise
- Changzhou High-Tech Product Certification
JINOO has passed the globally recognized quality management system verification with the commitment to the production of center drills, ensuring their consistent performance. They are widely exported to North America, Europe, and the Middle East due to our excellent manufacturing capabilities and export qualifications.
Get instant Quote

Technical Support & Tool Optimization

1.JINOO keeps optimizing the center drills based on continuous case study and customers’ feedback.

2.JINOO will provide you with comprehensive regrinding services. After 3 times regrinding, your tooling costs can be decreased by up to 38%.

3.We will offer you prompt after-sales technical support to ensure your user experience.

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Testimonials

“I have long chosen JINOO’s carbide center drills, which always gain stable performance and efficiency to significantly help my CNC center drills drill smoothly with reduced wear-out. I strongly suggest you try JINOO’s D9100-Series NC Center Drills if you are looking for effective pre-drilling operations. JINOO is really a reliable carbide center drill manufacturer.”
Gary Pitchfork
Head of Engineering Team

FAQ about Center Drills

What workpiece materials can your solid carbide center drills process?

Our carbide center drills are designed for universal machining purposes. There are widely available workpiece materials, including Steel Parts (P), Stainless Steel (M), Non-ferrous Metal (N), and High-temperature Alloy (S). Our larger polished HELICA flutes, combined with coating technology, enable our solid carbide center drills to gain significant performance on various workpieces.

With rich experiences, we can also achieve the perfect balance between standard and customization for CNC spotting drill bits to meet various unique demands.

What is a center drill for?

Our carbide center drills are designed for machining stainless steel and difficult-to-process materials. Due to the short flute length and prominent apex angle features of spotting drills, they are rigid enough to drill hard materials, especially stainless steel. Our unique CNC center drills significantly improve later machining efficiency and extend the tool’s lifespan.

How can coating technology enhance the performance of Center Drills?

The unique geometry design of our 90-degree carbide center drills and 120-degree carbide center drills, combined with advanced coating technology like TiN, can promote reduced chip accumulation during precise positioning and increase the center drill bit lifespan.

Can a spot drill replace a center drill?

Spot drills can’t replace center drills due to their different machining purposes. Spot drills are mainly used for machining starting points before drilling. However, center drills are more suitable for creating center holes due to their robust tool body and short cutting lengths.

What is the difference between a center drill and a regular drill?

Center drills are primarily applied for producing precision starting points and center holes before subsequent machining. They can significantly decrease tool deflection to ensure accurate positioning. However, regular drills are mainly used for drilling operations with higher material removal rates.

What things need to be considered during carbide center drill machining?

The design and quality of the Center Drills are critical factors that will impact the machining efficiency. In addition, other external factors should also be considered during the operation process.

Be cautious about the irregularities in the materials, which apply to both bar stock raw materials and machined materials. Any of these failures will increase the damage to the carbide center drills and render the machining ineffective. Flex in the drill is also a factor in the failure of the tools. The pointed tip might be away from the central axis line without the proper machining, leading to the position hole not being central, subsequent eccentric cutting of the main drill, and large hole tolerance variations. Always remember that the Center Drills are only used for “precise positioning” rather than materials removal and drilling purposes.

How to use a center drill?

It is important to have the proper methods for using Center Drills, especially if you want to achieve excellent pre-drilling operations and perfect protection for the following carbide drills.

It is critical to remember that Center Drills are used for pre-positioning to prevent the drill from walking and improve the hole’s accuracy and coaxiality.

Step 1: Choose the correct angle for the carbide center drills.

Step 2: Ensure the solid carbide drill bits are aligned and securely clamped.

Step 3: Check the relevant specifications, like the center drills’ rotation speed and feed rate.

Step 4: Control the drilling depth of spot drills, usually 0.5x-1x, with the diameter of the center drill.

Step 5: Confirm the purpose of further drilling; the main drills should be positioned at the central point.

How deep to go with center drill?

Center drills and carbide spot drills should maintain shallow drilling depths as they are only used for hole positioning. We recommend you drill with the recommended spotting depths between 0.3D and 0.6D of the drill bit diameter to avoid excessive cutting forces. Less tool wandering and hole positioning accuracy can be ensured with the correct drilling depths.

How fast should you run a center drill?

The best cutting speeds of center drills depend on the workpiece material and drill bit diameters. Higher spindle speeds are recommended for solid carbide CN center drills. For example, 3000 to 6000 RPM should be used for small-diameter workpieces in machining steel parts. Higher spindle speeds should be used for machining aluminum. Proper cutting speeds can promote accurate hole positioning and decrease tool vibration.

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ABOUT US

JINOO Tools Group is a “National High-Tech Enterprise”, which was founded in 2006 and specializes in manufacturing high-precision solid carbide cutting tools with over 25,000㎡ manufacturing bases. Our center drills are widely used in the automotive, aerospace, and equipment manufacturing industries. We have accumulated over 50 national patents and passed the ISO:9001 certification, devoted to creating high-value cutting solutions for our customers.