STRAIGHT-FLUTE DRILLS

Solid Carbide Straight-Flute Drills for Precision Drilling.

D7200-Series

Straight-Flute Drill Design Highlights

Solid Carbide Construction
Oerlikon Coating Technology
120° Point Angle Design
Straight Flute Geometry
Reinforced Web Core
Optimized cutting edge

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Straight-Flute Drill Bit Types

3×D Straight-Flute Drill Bits

Designed for shallow hole drilling with high tool rigidity and precision.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
Oerlikon HELICA Coating
2 Flutes
3×D
External coolant design
Internal Coolant Design
120° Point Angle
DIN 6535-HA
Straight Shank
Drilling
Right-Hand Cutting
Solid Carbide Construction
M7

5×D Straight-Flute Drill Bits

Suitable for drilling shallow to medium deep holes with improved hole accuracy.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
Oerlikon HELICA Coating
2 Flutes
5×D
External coolant design
Internal Coolant Design
120° Point Angle
DIN 6535-HA
Straight Shank
Drilling
Right-Hand Cutting
Solid Carbide Construction
M7

8×D Straight-Flute Drill Bits

Specialized for drilling deeper holes with consistent hole straightness.

P: Steel
M: Stainless Steel
K: Cast Iron
N: Non-ferrous
Oerlikon HELICA Coating
2 Flutes
8×D
External Coolant Design
Internal Coolant Design
120° Point Angle
DIN 6535-HA
Cylindrical shank
Drilling
Right-Hand Cutting
Solid Carbide Construction
M7

D7200-Series

Why Choose Our Straight-Flute Drills?

For our D7200 series straight-flute drills for cast iron, JINOO has optimized the straight flute design to achieve high-stability drilling.

machining efficiency of multi purpose drill bits

Solid Carbide Construction

Our straight-flute drills are manufactured from 0.4 μm fine-grain carbide substrates with uniform structures.

improved change efficiency of multi purpose drill bits

Oerlikon Coating Technology

Our straight-flute drill bits can be combined with advanced HELICA coating technology from Oerlikon.

Promoted hole wall quality of multi purpose drill bits

120° Point Angle Design

The 120° point angle enables high-stability entry of straight-flute drills.

machining consistency of multi purpose drill bits

Straight Flute Geometry

The straight flute is designed for superior chip control in machining short-chip materials.

extended tool life of multi purpose drill bits

Reinforced Web Core

The reinforced web core can improve tool rigidity and cross-sectional strength.

Wide material compatibility of multi purpose drill bits

Optimized Cutting Edge

Honed cutting edges can promote edge consistency of straight-flute drills.

Straight-Flute Drill Geometry Breakdown

1.0.4 μm Fine-Grain Carbide Substrate for Higher Durability

Featuring 0.4 μm ultra-fine grain carbide substrates with optimized microstructure, straight-flute drills have superior resistance to tool wear and edge deformation.

2.HELICA Coating for Reduced Friction

Oerlikon coatings can minimize heat generation and chip adhesion with a low coefficient of friction, enabling smooth chip flow and less flank wear.

3.120° Point Angle for Accurate Positioning

120° drill point angle can optimize the cutting force distribution and promote superior positioning accuracy.

4.Honed Cutting Edges for Edge Strength

Two main cutting edges with controlled edge radius can balance sharpness and cutting stability with minimal edge chipping.

5.Straight-Flute Geometry for Structural Strength

Straight flute design with a larger core section features high strength to avoid tool breakage and enhance drilling stability.

6.Reinforced Core for Superior Rigidity

The reinforced core structure can improve tool rigidity and torsional stiffness to decrease tool vibration and tool breakage.

7.Reduced Chisel Edge for Less Thrust Force

A shortened chisel edge can decrease axial thrust force and increase centering capability with less tool vibration.

8.Precisely-Ground Margin for Hole Accuracy

The precision ground margin can minimize frictional contact to improve the hole roundness and dimensional accuracy.

Geometry Breakdown of D7200-Series Straight Flute Drills

Technical Data

Ultra-fine Grain Substrate	0.4μm
Tolerance	M7
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

D7200-Series

Straight-Flute Drills Specifications

Straight-flute carbide drill sizes with 5xD drilling depths are available.

Size Chart
Carbide Substrate
Quick Selection Guide
Cutting Parameters

Code		Diameter (mm)	Diameter (in)	Shank Diameter (in)	Overal Length OAL(in)	Flute Length (in)	Max Cutting Depth (in)	Shank Length (in)
External Coolant	Internal Coolant	Diameter (mm)	Diameter (in)	Shank Diameter (in)	Overal Length OAL(in)	Flute Length (in)	Max Cutting Depth (in)	Shank Length (in)
D7203-NHA-D03175	D7203-CHA-D03175	3.175	0.125	6	62	20	14	36
D7203-NHA-D03571	D7203-CHA-D03571	3.571	0.1406	6	62	20	14	36
D7203-NHA-D03970	D7203-CHA-D03970	3.97	0.1563	6	66	24	17	36
D7203-NHA-D04366	D7203-CHA-D04366	4.366	0.1719	6	66	24	17	36
D7203-NHA-D04763	D7203-CHA-D04763	4.763	0.1875	6	66	28	20	36
D7203-NHA-D05159	D7203-CHA-D05159	5.159	0.2031	6	66	28	20	36
D7203-NHA-D05558	D7203-CHA-D05558	5.558	0.2188	6	66	28	20	36
D7203-NHA-D05949	D7203-CHA-D05949	5.949	0.2344	6	66	28	20	36
D7203-NHA-D06350	D7203-CHA-D06350	6.35	0.25	8	79	34	24	36
D7203-NHA-D06746	D7203-CHA-D06746	6.746	0.2656	8	79	34	24	36
D7203-NHA-D07145	D7203-CHA-D07145	7.145	0.2813	8	79	41	29	36
D7203-NHA-D07541	D7203-CHA-D07541	7.541	0.2969	8	79	41	29	36
D7203-NHA-D07938	D7203-CHA-D07938	7.938	0.3125	8	79	41	29	36
D7203-NHA-D08344	D7203-CHA-D08344	8.334	0.3281	10	89	47	35	40
D7203-NHA-D08733	D7203-CHA-D08733	8.733	0.3438	10	89	47	35	40
D7203-NHA-D09129	D7203-CHA-D09129	9.129	0.3594	10	89	47	35	40
D7203-NHA-D09525	D7203-CHA-D09525	9.525	0.375	10	89	47	35	40
D7203-NHA-D09921	D7203-CHA-D09921	9.921	0.3906	10	89	47	35	40
D7203-NHA-D10320	D7203-CHA-D10320	10.32	0.4063	12	102	55	40	45
D7203-NHA-D10716	D7203-CHA-D10716	10.716	0.4219	12	102	55	40	45
D7203-NHA-D11111	D7203-CHA-D11111	11.111	0.4375	12	102	55	40	45
D7203-NHA-D11509	D7203-CHA-D11509	11.509	0.4531	12	102	55	40	45
D7203-NHA-D11908	D7203-CHA-D11908	11.908	0.4688	12	102	55	40	45
D7203-NHA-D12300	D7203-CHA-D12300	12.3	0.4843	14	107	60	43	45
D7203-NHA-D12700	D7203-CHA-D12700	12.7	0.5	14	107	60	43	45
D7203-NHA-D13100	D7203-CHA-D13100	13.1	0.5157	14	107	60	43	45
D7203-NHA-D13891	D7203-CHA-D13891	13.891	0.5469	14	107	60	43	45
D7203-NHA-D14288	D7203-CHA-D14288	14.288	0.5625	16	115	65	45	48
D7203-NHA-D14684	D7203-CHA-D14684	14.684	0.5781	16	115	65	45	48
D7203-NHA-D15083	D7203-CHA-D15083	15.083	0.5938	16	115	65	45	48
D7203-NHA-D15479	D7203-CHA-D15479	15.479	0.6094	16	115	65	45	48
D7203-NHA-D15875	D7203-CHA-D15875	15.875	0.625	16	115	65	45	48
D7203-NHA-D17463	D7203-CHA-D17463	17.463	0.6875	18	123	73	51	48
D7203-NHA-D19050	D7203-CHA-D19050	19.05	0.75	20	131	79	55	50

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	0.11	0.14	0.2	0.26	0.32	0.35	4	45	0.5	0.55
	P2	Low Carbon Steel（C<0.25%）	<125			100	0.11	0.14	0.2	0.26	0.32	0.35	0.4	0A5	0.5	0.55
	P4	Medium Carbon Steel(0.25%<C<0.60%), Low Alloy Steel	<20	<26		100	0.11	0.14	0.2	26	0.32	0.35	0.4	45	0.5	0.55
	P5	Alloy Steel, Quenched and Tempered Steel	330	28-35		100	0.11	0.14	2	0.26	0.32	0.35	0.4	0.45	0.5	0.55
H	H5	Quenched and Tempered Steel		35-40		85	0.11	0.14	2	0.26	0.32	0.35	4	0A5	0.5	0.55
K	K1	Gray Cast Iron	120-290	<32		100	0.11	0.14	2	0.26	0.32	0.35	4	45	0.5	0.65
	K2	Compacted Graphite Iron（CGI）	120-290	<32		100	0.11	0.14	2	26	0.32	0.35	0.4	45	0.5	0.55
	K3	Malleable Cast Iron	130-260	<28		100	0.11	0.14	0.2	0.26	0.32	0.35	4	0.45	0.5	0.55
	K⁴	Ductile Cast Iron	180-350	<43		90	0.11	0.14	2	26	0.32	0.35	0.4	45	0.5	0.55

Straight-Flute Drill Application Cases

One-Pass Drilling in Hydraulic Valve Body Machining

Background

A hydraulic valve components supplier experienced excessive cycle times and short tool life in creating pre-drilled holes, and too many tool changes enhanced overall tooling costs.

Challenge

Workpiece: Hydraulic Valve Body
Material: AISI 304 Stainless Steel
Hardness: 180–210 HB
Hole Type: Blind Hole
Hole Depth: Ø8.5 mm
Requirement: Longer tool life with higher productivity and stable chip flow.

Solution

Tool Used: D7200-Series 5D Straight Shank Drill
Coolant Type: Internal Coolant
Machine Tool: Vertical CNC Machining Center
Spindle Speed: 3,900 rpm
Feed Rate: 0.18 mm/rev (702 mm/min)

Results

Compared with the previously used drill, our straight-shank drills can achieve approximately 66% longer tool life and 88% reduced cycle time, decreasing the production costs and ensuring better chip control.

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Real Case of D7200-Series Straight Flute Drills

How JINOO Manufactures Straight-Flute Drills?

Precision CNC Grinding Machines

- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
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- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
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- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
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- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
Get instant Quote
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
These high-precision 5-axis grinding devices are engineered for machining straight-flute drills with their unique tool geometry, ensuring their tight tolerances within 0.003 mm and extended tool life.
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Advanced Quality Inspection System

1.ZOLLER G3 Tool Measurement: Utilized to verify the geometry and dimensional parameters of our straight-flute drills with measurement tolerances within ±2 μm.

2.PG1000 Optical Inspection: Used to perform microscopic analysis of edge preparation, coating conditions, and tool integrity to identify edge defects.

3.Parlec Tool Presetting: Used to ensure the correct tool length, minimal runout, and accurate clamping positioning.

We use the advanced quality inspection system to ensure our strict quality control, making straight-flute drills beyond the standard.
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1.ZOLLER G3 Tool Measurement: Utilized to verify the geometry and dimensional parameters of our straight-flute drills with measurement tolerances within ±2 μm.

2.PG1000 Optical Inspection: Used to perform microscopic analysis of edge preparation, coating conditions, and tool integrity to identify edge defects.

3.Parlec Tool Presetting: Used to ensure the correct tool length, minimal runout, and accurate clamping positioning.

We use the advanced quality inspection system to ensure our strict quality control, making straight-flute drills beyond the standard.
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1.ZOLLER G3 Tool Measurement: Utilized to verify the geometry and dimensional parameters of our straight-flute drills with measurement tolerances within ±2 μm.

2.PG1000 Optical Inspection: Used to perform microscopic analysis of edge preparation, coating conditions, and tool integrity to identify edge defects.

3.Parlec Tool Presetting: Used to ensure the correct tool length, minimal runout, and accurate clamping positioning.

We use the advanced quality inspection system to ensure our strict quality control, making straight-flute drills beyond the standard.
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Fine-grain Carbide Tool Material

1.High-quality straight-flute drills of JINOO are manufactured from high-purity carbide tool materials, which are sourced from Guhring and GESAC.

2.Premium carbide tool material can deliver high durability and rigidity with high density, ensuring the heat and wear resistance of our straight-flute drills.

3.The cobalt content in our tungsten carbide substrates ranges from 10% to 12%.

4.The tool life of straight-flute drill bits can be extended by over 1.5 times.
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Virgin Carbide Instead of Recycled Carbide

Virgin tungsten carbide we use in our straight-flute drills:
- Uniform grain size
- No impurities
- Longer lifespan
- Pure structure
- High wear resistance
Recycled carbide used in poor-quality drills:
- Uneven grain size
- Many impurities
- Loose structure
- Prone to tool breakage
- Short tool lifespan
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Reliable Coating Partners

1.JINOO utilizes advanced coating technology from Oerlikon Balzers, which can help improve the cutting performance of straight-flute drills.

2.We can customize straight-flute drill bits for you with a combination of durable coatings.

3.High-performance coatings feature high tool rigidity and density.

4.Featuring durable coatings, our cutting tools can maximize their performance and tool service life under mass production.
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High-performance Coating vs. Poor-quality Coating

High-quality coatings used in JINOO’s straight-flute drills:
- No peeling or flaking
- Consistent thickness
- Free of pores
- High oxidation resistance
- No edge adhesion
Poor-quality coatings used in inferior drill bits:
- Prone to peeling
- Edge buildup
- Obvious pores
- Rapid tool wear
- Short tool life
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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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
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
As a professional straight-flute drill bit manufacturer, we insist on high-quality manufacturing and continuous quality assurance training to suit global industrial requirements with authoritative approvals.
Get instant Quote

Technical Support & Tool Optimization

1.We can customize tools for you according to a wide range of tool sizes.

2.JINOO can offer you regrinding services to improve the straight-flute drill bit life. You can save over 38% tooling costs after regrinding for 3 times, and achieve excellent consistency of grinding tools.

3.JINOO’ s experienced engineering team can provide you with comprehensive technical support.
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Testimonials

“We have been using JINOO’s 5D solid carbide straight-flute drill bits for machining cast iron. We’ve received superior hole accuracy and smoother chip evacuation. We previously used conventional twist drills, which are less rigid and long-lasting than straight-flute drills specialized for drilling cast iron.”
Michael Schneider
Production Manager

FAQ about Straight-Flute Drills

What is the lead time of straight-flute drills for production?

Our production times for the straight-flute drills will normally be between 7 and 15 days because of the premium carbide bar stocks, which need to be shipped from Germany. As for the lead time, we work with world-famous postal companies such as DHL, FedEx and UPS to secure the time of delivery.

Do you provide customized services of straight-flute drills?

Of course! We furnish non-standard customization beyond standard sizes according to your personalized needs. Factors such as materials, diameter, flute length, and coating selection of JINOO’s straight-flute drills can all be modified to meet your exacting requirements. We will provide you with cutting-edge solutions to ensure an exceptional user experience.

What is your MOQ (Minimum Order Quantity) of straight-flute drills?

For our standard size of solid carbide straight-flute drills, we have a minimum order quantity of 5 pieces. Beyond that, if you want JINOO to customize tools for you, there’s generally no minimum order quantity for non-standard tools, and even a small order can be accepted.

What payment methods do you accept for solid carbide straight-flute drills?

The payment method of our straight-flute drills can be flexible. We usually accept bank transfer, credit card, and PayPal. If you have other requirements about the payment method, we can modify the payment method based on your order.

What is the difference between a twist drill and a straight flute drill?

Twist drill bits are designed with helical flutes for chip evacuation, and they are common for machining metal, steel parts, and wood. Straight-flute drill bits feature parallel flutes, which have no helix angles. Hence, they have higher rigidity and hole accuracy, while less efficient chip evacuation.

In modern CNC machining, twist drill bits are more suitable for drilling deep holes and machining long-chip materials. However, straight-flute drills are more typical for machining shallow holes and cast iron with demanding requirements of cutting stability and hole roundness.

How does an external coolant straight shank drill improve CNC machining performance?

External coolant design of straight shank drills can deliver coolants to cutting edges to directly decrease heat generation and tool friction, which is suitable for drilling deep holes and machining harder materials with longer tool life.

Why choose a straight shank straight flute drill over a standard twist drill?

Straight-flute drill bits can deliver superior tool rigidity and improved chip control. They demonstrate higher cutting stability in CNC machining with hole accuracy, especially in drilling harder materials.

Why use straight flute drills for cast iron?

Straight-flute drills are perfect for CNC machining of cast iron as they feature improved tool rigidity, further decreasing the tool vibration and improving the hole accuracy. Compared with standard twist drills, their optimized straight flute design can promote their hole straightness.

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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 cutting tools 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-quality straight-flute drills for you.