Stable Roughing with Bull Nose End Mills
Bull Nose End Mills Design Highlights
- Premium UMG Carbide
- Variable Helix Angle
- Fine Edge Passivation
- Deep Flute Design
- Advanced Nano Coatings
- Reinforced Corner Radius
Why choose our high-performance bull nose end mills?
We offer a wide range of bull nose end mills to suit different applications. You can choose different coatings, helix angles, flute design, and corner radius geometry. Our end mills deliver long tool life and high machining stability.
Premium Tungsten Carbide
JINOO uses 0.4μm premium carbide to manufacture bull nose end mills. The carbide rods are made of tungsten carbide (WC) particles and uniform cobalt.
Variable Helix Angles
You can choose a suitable helix angle, such as 30°, 35°, 38°, or 45°. We also provide variable helix angles, such as 35°/38° or 38°/40°.
Fine Edge Passivation
Our bull nose end mills’ cutting edges undergo fine passivation to improve performance.
Deep Flute Design
Bull nose end mills use a deep flute design and have large cutting areas.
Advanced Nano Coatings
Backed by Oerlikon Balzers Coatings, AlTiN, TiAlN, TiAlSiN, DLC, AlCrN, AlCrSiN, AlTiSiN, TiSiXN, and customised coatings are available.
Reinforced Corner Radius
Our bull nose end mills are designed with corner radius geometry, and the corner radius tolerance can be controlled to±0.005 mm.
Details that make our bull nose end mills stand out
1. Premium carbide substrate for wear resistance
Manufactured from 0.4 μm premium tungsten carbide, our bull nose end mills balance rigidity and toughness. They deliver high hardness and low vibration.
2. Variable helix angle for stable cutting
Variable helix angles can enhance the efficiency of chip removal and reduce vibration.
3. Edge passivation for different materials
Fine-honed edges enhance edge strength and are suitable for machining steel and stainless steel. Sharp edges are suitable for aluminum machining.
4. Deep flute design for smooth chip removal
Deep chip flutes provide larger chip space and improve chip flow efficiency, especially in slotting.
5. Nano coating for wear resistance
Advanced coatings, such as TiAlSiN, AlCrSiN, TiAIN, AITiN, AlCrN, and DLC, enhance wear resistance and extend tool life.
6. Precision corner radius for consistent accuracy
The radius tolerance is ±0.005 mm. High bull nose radius accuracy can ensure consistent semi-finishing milling.
7. Reinforced core for high rigidity
The reinforced core means optimized tool diameter. This design can increase rigidity and reduce tool vibration.
Technical Data
| Cutting Diameter Tolerance | H6 |
| Corner Radius | 0.2- 2 mm |
| Radius Tolerance | ±0.005mm |
| Coating | AlTiN + TiSiN / TiAlSiN-X / AlTiN / TiAlN / TiAlSiN / DLC / AlCrN / AlCrSiN / AlTiSiN / TiSiXN / Customised Available |
| Flute Number | 2 / 3 / 4 / 5 Flutes / Customised Number |
| Overall Length | 50 / 60 / 75 / 100 / 150 / 200mm / Customised Length |
| Shank Diameter | 4 / 6 / 8 / 10 / 12 / 14 / 16/ 18 / 20mm / Customised Diameter |
Bull Nose End Mills Specifications
Solid carbide bull nose end mills with different cutting parameters are available.
Size Chart
Recommended Cutting Parameters
Quick Selection Guide
Carbide Substrate
| Type No. | D | Lc | R | L | d | Specification |
| 4R | 1 | 3 | 0.1 | 50 | 4 | 1*R0.1*3*4*50L |
| 4R | 1 | 3 | 0.2 | 50 | 4 | 1*R0.2*3*4*50L |
| 4R | 1.5 | 5 | 0.1 | 50 | 4 | 1.5*R0.1*5*4*50L |
| 4R | 1.5 | 5 | 0.2 | 50 | 4 | 1.5*R0.2*5*4*50L |
| 4R | 2 | 6 | 0.1 | 50 | 4 | 2*R0.1*6*4*50L |
| 4R | 2 | 6 | 0.2 | 50 | 4 | 2*R0.2*6*4*50L |
| 4R | 2 | 6 | 0.5 | 50 | 4 | 2*R0.5*6*4*50L |
| 4R | 2.5 | 8 | 0.2 | 50 | 4 | 2.5*R0.2*8*4*50L |
| 4R | 3 | 9 | 0.1 | 50 | 4 | 3*R0.1*9*4*50L |
| 4R | 3 | 9 | 0.2 | 50 | 3 | 3*R0.2*9*3*50L |
| 4R | 3 | 9 | 0.2 | 50 | 4 | 3*R0.2*9*4*50L |
| 4R | 3 | 9 | 0.2 | 50 | 6 | 3*R0.2*9*6*50L |
| 4R | 3 | 9 | 0.5 | 50 | 3 | 3*R0.5*9*3*50L |
| 4R | 3 | 9 | 0.5 | 50 | 4 | 3*R0.5*9*4*50L |
| 4R | 3 | 9 | 0.5 | 50 | 6 | 3*R0.5*9*6*50L |
| 4R | 4 | 11 | 0.1 | 50 | 4 | 4*R0.1*11*4*50L |
| 4R | 4 | 11 | 0.2 | 50 | 4 | 4*R0.2*11*4*50L |
| 4R | 4 | 11 | 0.2 | 50 | 6 | 4*R0.2*11*6*50L |
| 4R | 4 | 11 | 0.3 | 50 | 4 | 4*R0.3*11*4*50L |
| 4R | 4 | 11 | 0.5 | 50 | 4 | 4*R0.5*11*4*50L |
| 4R | 4 | 11 | 0.5 | 50 | 6 | 4*R0.5*11*6*50L |
| 4R | 4 | 11 | 1 | 50 | 4 | 4*R1*11*4*50L |
| 4R | 5 | 13 | 0.1 | 50 | 6 | 5*R0.1*13*6*50L |
| 4R | 5 | 13 | 0.2 | 50 | 6 | 5*R0.2*13*6*50L |
| 4R | 5 | 13 | 0.5 | 50 | 5 | 5*R0.5*13*5*50L |
| 4R | 5 | 13 | 0.5 | 50 | 6 | 5*R0.5*13*6*50L |
| 4R | 5 | 13 | 1 | 50 | 6 | 5*R1*13*6*50L |
| 4R | 6 | 15 | 0.1 | 50 | 6 | 6*R0.1*15*6*50L |
| 4R | 6 | 15 | 0.2 | 50 | 6 | 6*R0.2*15*6*50L |
| 4R | 6 | 15 | 0.3 | 50 | 6 | 6*R0.3*15*6*50L |
| 4R | 6 | 15 | 0.5 | 50 | 6 | 6*R0.5*15*6*50L |
| 4R | 6 | 15 | 1 | 50 | 6 | 6*R1*15*6*50L |
| 4R | 6 | 15 | 1.5 | 50 | 6 | 6*R1.5*15*6*50L |
| 4R | 8 | 20 | 0.2 | 60 | 8 | 8*R0.2*20*8*60L |
| 4R | 8 | 20 | 0.3 | 60 | 8 | 8*R0.3*20*8*60L |
| 4R | 8 | 20 | 0.5 | 60 | 8 | 8*R0.5*20*8*60L |
| 4R | 8 | 20 | 1 | 60 | 8 | 8*R1*20*8*60L |
| 4R | 8 | 20 | 1.5 | 60 | 8 | 8*R1.5*20*8*60L |
| 4R | 8 | 20 | 2 | 60 | 8 | 8*R2*20*8*60L |
| 4R | 8 | 20 | 3 | 60 | 8 | 8*R3*20*8*60L |
| 4R | 10 | 25 | 0.2 | 75 | 10 | 10*R0.2*25*10*75L |
| 4R | 10 | 25 | 0.3 | 75 | 10 | 10*R0.3*25*10*75L |
| 4R | 10 | 25 | 0.5 | 75 | 10 | 10*R0.5*25*10*75L |
| 4R | 10 | 25 | 1 | 75 | 10 | 10*R1*25*10*75L |
| 4R | 10 | 25 | 1.5 | 75 | 10 | 10*R1.5*25*10*75L |
| 4R | 10 | 25 | 2 | 75 | 10 | 10*R2*25*10*75L |
| 4R | 10 | 25 | 2.5 | 75 | 10 | 10*R2.5*25*10*75L |
| 4R | 10 | 25 | 3 | 75 | 10 | 10*R3*25*10*75L |
| 4R | 12 | 30 | 0.2 | 75 | 12 | 12*R0.2*30*12*75L |
| 4R | 12 | 30 | 0.5 | 75 | 12 | 12*R0.5*30*12*75L |
| 4R | 12 | 30 | 1 | 75 | 12 | 12*R1*30*12*75L |
| 4R | 12 | 30 | 2 | 75 | 12 | 12*R2*30*12*75L |
| 4R | 12 | 30 | 3 | 75 | 12 | 12*R3*30*12*75L |
| 4R | 16 | 40 | 0.5 | 100 | 16 | 16*R0.5*40*16*100L |
| 4R | 16 | 40 | 1 | 100 | 16 | 16*R1*40*16*100L |
| 4R | 16 | 40 | 2 | 100 | 16 | 16*R2*40*16*100L |
| 4R | 16 | 40 | 3 | 100 | 16 | 16*R3*40*16*100L |
| 4R | 20 | 50 | 1 | 100 | 20 | 20*R1*50*20*100L |
| 4R | 20 | 50 | 2 | 100 | 20 | 20*R2*50*20*100L |
| 4R | 20 | 50 | 3 | 100 | 20 | 20*R3*50*20*100L |
| 4R | 1 | 3 | 0.2 | 75 | 4 | 1*R0.2*3*4*75L |
| 4R | 1.5 | 5 | 0.2 | 75 | 4 | 1.5*R0.2*5*4*75L |
| 4R | 2 | 6 | 0.2 | 75 | 4 | 2*R0.2*6*4*75L |
| 4R | 2 | 6 | 0.5 | 75 | 4 | 2*R0.5*6*4*75L |
| 4R | 3 | 9 | 0.2 | 75 | 4 | 3*R0.2*9*4*75L |
| 4R | 3 | 9 | 0.2 | 75 | 6 | 3*R0.2*9*6*75L |
| 4R | 3 | 9 | 0.5 | 75 | 4 | 3*R0.5*9*4*75L |
| 4R | 3 | 9 | 0.5 | 75 | 6 | 3*R0.5*9*6*75L |
| 4R | 4 | 12 | 0.2 | 75 | 4 | 4*R0.2*12*4*75L |
| 4R | 4 | 12 | 0.2 | 75 | 6 | 4*R0.2*12*6*75L |
| 4R | 4 | 12 | 0.5 | 75 | 4 | 4*R0.5*12*4*75L |
| 4R | 4 | 12 | 0.5 | 75 | 6 | 4*R0.5*12*6*75L |
| 4R | 4 | 12 | 0.5 | 100 | 4 | 4*R0.5*12*4*100L |
| 4R | 4 | 12 | 1 | 75 | 4 | 4*R1*12*4*75L |
| 4R | 4 | 12 | 1 | 100 | 4 | 4*R1*12*4*100L |
| 4R | 5 | 13 | 0.2 | 75 | 6 | 5*R0.2*13*6*75L |
| 4R | 5 | 13 | 0.5 | 75 | 5 | 5*R0.5*13*5*75L |
| 4R | 5 | 13 | 0.5 | 75 | 6 | 5*R0.5*13*6*75L |
| 4R | 5 | 13 | 1 | 75 | 6 | 5*R1*13*6*75L |
| 4R | 6 | 15 | 0.2 | 75 | 6 | 6*R0.2*15*6*75L |
| 4R | 6 | 15 | 0.5 | 75 | 6 | 6*R0.5*15*6*75L |
| 4R | 6 | 15 | 0.5 | 100 | 6 | 6*R0.5*15*6*100L |
| 4R | 6 | 15 | 1 | 75 | 6 | 6*R1*15*6*75L |
| 4R | 6 | 15 | 1 | 100 | 6 | 6*R1*15*6*100L |
| 4R | 6 | 15 | 1.5 | 75 | 6 | 6*R1.5*15*6*75L |
| 4R | 8 | 20 | 0.2 | 75 | 8 | 8*R0.2*20*8*75L |
| 4R | 8 | 20 | 0.2 | 100 | 8 | 8*R0.2*20*8*100L |
| 4R | 8 | 20 | 0.5 | 75 | 8 | 8*R0.5*20*8*75L |
| 4R | 8 | 20 | 0.5 | 100 | 8 | 8*R0.5*20*8*100L |
| 4R | 8 | 20 | 1 | 75 | 8 | 8*R1*20*8*75L |
| 4R | 8 | 20 | 1 | 100 | 8 | 8*R1*20*8*100L |
| 4R | 8 | 20 | 1.5 | 75 | 8 | 8*R1.5*20*8*75L |
| 4R | 8 | 20 | 1.5 | 100 | 8 | 8*R1.5*20*8*100L |
| 4R | 8 | 20 | 2 | 75 | 8 | 8*R2*20*8*75L |
| 4R | 8 | 20 | 2 | 100 | 8 | 8*R2*20*8*100L |
| 4R | 10 | 25 | 0.2 | 100 | 10 | 10*R0.2*25*10*100L |
| 4R | 10 | 25 | 0.5 | 100 | 10 | 10*R0.5*25*10*100L |
| 4R | 10 | 25 | 1 | 100 | 10 | 10*R1*25*10*100L |
| 4R | 10 | 25 | 2 | 100 | 10 | 10*R2*25*10*100L |
| 4R | 12 | 30 | 0.2 | 100 | 12 | 12*R0.2*30*12*100L |
| 4R | 12 | 30 | 0.5 | 100 | 12 | 12*R0.5*30*12*100L |
| 4R | 12 | 30 | 1 | 100 | 12 | 12*R1*30*12*100L |
| 4R | 16 | 40 | 0.5 | 150 | 16 | 16*R0.5*40*16*150L |
| 4R | 16 | 40 | 1 | 150 | 16 | 16*R1*40*16*150L |
| 4R | 16 | 40 | 2 | 150 | 16 | 16*R2*40*16*150L |
| 4R | 16 | 40 | 3 | 150 | 16 | 16*R3*40*16*150L |
| 4R | 20 | 50 | 1 | 150 | 20 | 20*R1*50*20*150L |
| 4R | 20 | 50 | 2 | 150 | 20 | 20*R2*50*20*150L |
| 4R | 20 | 50 | 3 | 150 | 20 | 20*R3*50*20*150L |
| 4R | 1 | 4 | 0.2 | 75 | 4 | 1*R0.2*4*4*75L |
| 4R | 1.5 | 6 | 0.2 | 75 | 4 | 1.5*R0.2*6*4*75L |
| 4R | 2 | 8 | 0.2 | 75 | 4 | 2*R0.2*8*4*75L |
| 4R | 2 | 8 | 0.5 | 75 | 4 | 2*R0.5*8*4*75L |
| 4R | 3 | 12 | 0.2 | 75 | 4 | 3*R0.2*12*4*75L |
| 4R | 3 | 12 | 0.2 | 75 | 6 | 3*R0.2*12*6*75L |
| 4R | 3 | 12 | 0.5 | 75 | 4 | 3*R0.5*12*4*75L |
| 4R | 3 | 12 | 0.5 | 75 | 6 | 3*R0.5*12*6*75L |
| 4R | 4 | 16 | 0.2 | 75 | 4 | 4*R0.2*16*4*75L |
| 4R | 4 | 16 | 0.2 | 75 | 6 | 4*R0.2*16*6*75L |
| 4R | 4 | 16 | 0.5 | 75 | 4 | 4*R0.5*16*4*75L |
| 4R | 4 | 16 | 0.5 | 75 | 6 | 4*R0.5*16*6*75L |
| 4R | 4 | 16 | 1 | 75 | 4 | 4*R1*16*4*75L |
| 4R | 5 | 20 | 0.2 | 75 | 6 | 5*R0.2*20*6*75L |
| 4R | 5 | 20 | 0.5 | 75 | 5 | 5*R0.5*20*5*75L |
| 4R | 5 | 20 | 0.5 | 75 | 6 | 5*R0.5*20*6*75L |
| 4R | 5 | 20 | 1 | 75 | 6 | 5*R1*20*6*75L |
| 4R | 6 | 24 | 0.2 | 75 | 6 | 6*R0.2*24*6*75L |
| 4R | 6 | 24 | 0.5 | 75 | 6 | 6*R0.5*24*6*75L |
| 4R | 6 | 24 | 1 | 75 | 6 | 6*R1*24*6*75L |
| 4R | 6 | 24 | 1.5 | 75 | 6 | 6*R1.5*24*6*75L |
| 4R | 8 | 32 | 0.2 | 75 | 8 | 8*R0.2*32*8*75L |
| 4R | 8 | 32 | 0.2 | 100 | 8 | 8*R0.2*32*8*100L |
| 4R | 8 | 32 | 0.5 | 75 | 8 | 8*R0.5*32*8*75L |
| 4R | 8 | 32 | 0.5 | 100 | 8 | 8*R0.5*32*8*100L |
| 4R | 8 | 32 | 1 | 75 | 8 | 8*R1*32*8*75L |
| 4R | 8 | 32 | 1 | 100 | 8 | 8*R1*32*8*100L |
| 4R | 8 | 32 | 1.5 | 75 | 8 | 8*R1.5*32*8*75L |
| 4R | 8 | 32 | 1.5 | 100 | 8 | 8*R1.5*32*8*100L |
| 4R | 8 | 32 | 2 | 75 | 8 | 8*R2*32*8*75L |
| 4R | 8 | 32 | 2 | 100 | 8 | 8*R2*32*8*100L |
| 4R | 10 | 40 | 0.2 | 100 | 10 | 10*R0.2*40*10*100L |
| 4R | 10 | 40 | 0.5 | 100 | 10 | 10*R0.5*40*10*100L |
| 4R | 10 | 40 | 1 | 100 | 10 | 10*R1*40*10*100L |
| 4R | 10 | 40 | 2 | 100 | 10 | 10*R2*40*10*100L |
| 4R | 12 | 50 | 0.2 | 100 | 12 | 12*R0.2*50*12*100L |
| 4R | 12 | 50 | 0.5 | 100 | 12 | 12*R0.5*50*12*100L |
| 4R | 12 | 50 | 1 | 100 | 12 | 12*R1*50*12*100L |
| 4R | 16 | 65 | 0.5 | 150 | 16 | 16*R0.5*65*16*150L |
| 4R | 16 | 65 | 1 | 150 | 16 | 16*R1*65*16*150L |
| 4R | 16 | 65 | 2 | 150 | 16 | 16*R2*65*16*150L |
| 4R | 16 | 65 | 3 | 150 | 16 | 16*R3*65*16*150L |
| 4R | 20 | 80 | 1 | 150 | 20 | 20*R1*80*20*150L |
| 4R | 20 | 80 | 2 | 150 | 20 | 20*R2*80*20*150L |
| 4R | 20 | 80 | 3 | 150 | 20 | 20*R3*80*20*150L |
| Workpiece material | Cast iron,carbon steel 550C、HT250、Q235(HRC22) | Alloyed steel,tool steel P20、H13、D2(HRC25-35) | Heat-treated steel SKD11、SKH51(HRC55-65) | |||||||||
| Designation | s/min⁻ | Vf/mm/min | ap/mm | ae/mm | s/min⁻¹ | Vf/mm/min | ap/mm | ae/mm | s/min⁻ | Vf/mm/min | ap/mm | ae/mm |
| D1R0.2 | 18000-20000 | 800-1000 | 0.02-0.03 | 0.02-0.03 | 16000-18000 | 650-850 | 0.02-0.03 | 0.02-0.03 | 20000-22000 | 1000-1200 | 0.02-0.03 | 0.02-0.03 |
| D1.5R0.2 | 18000-20000 | 800-1000 | 0.02-0.03 | 0.02-0.03 | 16000-18000 | 650-850 | 0.02-0.03 | 0.02-003 | 20000-22000 | 1000-1200 | 0.02-0.03 | 0.02-0.03 |
| D2.DR0.2 | 15000-18000 | 1000-1200 | 0.03-0.04 | 0.03-0.04 | 13000-15000 | 850-1000 | 0.03-0.04 | 003-0.04 | 18000-20000 | 1200-1400 | 0.03-0.04 | 0.03-0.04 |
| D3R0.2 | 13000-15000 | 1200-1400 | 0.03-0.05 | 0.03-0.05 | 11000-13000 | 1000-1200 | 0.04-0.05 | 0.03-0.05 | 15000-18000 | 1400-1600 | 0.04-0.05 | 0.03-0.05 |
| D4R0.5 | 10000-12000 | 1500-1800 | 0.05-0.08 | 0.05-0.08 | 8500-10000 | 1200-1500 | 0.05-0.08 | 0.05-0.08 | 12000-15000 | 1600-1800 | 0.05-0.08 | 0.05-0.08 |
| D6R0.5 | 7000-8000 | 1800-2000 | 0.05-01 | 0.05-0.1 | 6000-7000 | 1500-1800 | 0.05-0.1 | 0.05-0.1 | 8500-10000 | 2000-2200 | 0.05-0.1 | 0.05-0.1 |
| D8R0.5 | 6500-7500 | 1800-2200 | 0.05-0.12 | 0.05-0.12 | 5500-6000 | 1800-2000 | 0.08-0.15 | Q08-0.12 | 7000-7500 | 2200-2500 | 0.08-0.15 | 0.08-0.12 |
| D10R0.5 | 5500-6500 | 2200-2500 | 0.05-0.15 | 0.05-0.15 | 5000-6000 | 2000-2300 | 0.1-0.15 | 0.08-0.15 | 6000-7000 | 2500-2800 | 0.1-0.15 | 0.08-0.15 |
| D12R0.5 | 4500-5500 | 2500-2800 | 0.08-02 | 0.08-0.2 | 4000-5000 | 2300-2500 | 0.1-0.2 | 0.1-0.15 | 5000-6000 | 2800-3000 | 0.1-0.2 | 0.1-0.15 |
| Materials | Workpiece Materials | Type | ||
| ISO | ||||
P | P1 | Free-Cutting Steel | UP / UT / UK / UM / US / UHT / UR / S65 / S60 / S58 / S55 / SM / SEU / SR | |
| 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 | UP / UH / UT / UK / UM / UHT / UR / S68 / S65 / SEU | |
| H7 | Bearing Steel | |||
| H8 | Tool Steel, High Speed Steel | |||
| H12 | Hardened Stainless Steel | |||
| H21 | Zinc-Plated Steel | |||
M | M1 | Austenitic Stainless Steel | UP / UK / UM / US / UR / S65 / S60 / S58 / SM / SEU | |
| M2 | High-Strength Austenitic Stainless Steel | |||
| M4 | Duplex Stainless Steel | |||
S | S1 | Iron-Based Superalloy | UM / US / UR / SM | |
| S2 | Cobalt-Based Superalloy | |||
| S3 | Nickel-Based Superalloy | |||
| S11 | Titanium Alloy (Low Alloy) | |||
| S13 | Titanium Alloy (High Alloy) | |||
K | K1 | Gray Cast Iron | UP / UK / UM / UR / S65 / S60 / S58 / S55 / SEU / SR | |
| K2 | Compacted Graphite Iron（CGI） | |||
| K3 | Malleable Cast Iron | |||
| K4 | Ductile Cast Iron | |||
N | N1 | Aluminum-Silicon Alloy, Silicon content<9% | UA / SA / SR | |
| 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 | |||
| 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 |
Real Case
Bull Nose End Mill Application Case
- Customer Background
Our customer manufactures 17-4PH stainless steel parts. Due to the material’s high rigidity, it requires tools that deliver excellent wear resistance and stability.
- Challenge
- Material: 17-4PH Stainless Steel
- Hardness: HRC 35-45
- Workpiece Size: 110 × 65 × 28 mm
- Requirement: Extend tool life & Maintain high machining efficiency & Reduce risk of edge chipping
- Solution
- Tool Used: JRS4R-GD D12 Bull Nose End Mills
- Coolant Type: Flood Coolant
- Machine Tool: VMC850 Vertical Machining Center
- Result
- Tool life increased by 80%
- Reduced tool change frequency
- Lower tooling cost per part
How JINOO Manufactures Bull Nose End Mills?
High-precision Equipment
- WALTER Helitronic Power 400L
- WALTER Helitronic Vision 400L
- WALTER Helitronic Micro 400L
- Rollomatic NP5
- ANCA MX5
- ANCA MX7
Compared to traditional equipment, our premium equipment performs better in edge sharpness and contour control. We commit to delivering accurate bull nose geometry.
Strict Inspection System
- Zoller G3: Used for inspecting tool geometry, diameter, corner radius, flute profile, and helix angle.
- PG1000: Used for profile inspection and cutting-edge verification.
- Parlec: Used for quality consistency inspection and dimensional verification.
JINOO uses advanced testing equipment to ensure the precision and consistency of bull nose end mills. We can achieve full-process quality control and promise that every bull nose end mill undergoes 100% inspection.
High-performance Carbide Rods
- High-performance carbide rods sourced from GESAC, Kennametal, Sandvik, Gühring, and CB Ceratizit.
- Featuring fine and uniform grain structure, stable cobalt distribution, and excellent wear resistance.
- Suitable for high-speed machining and hardened material cutting, ensuring stable cutting performance.
- The cobalt content of all carbide rods is controlled within 10%–12%.
JINOO Virgin Carbide vs Recycled Carbide
JINOO Virgin Carbide used in our milling cutters:
- Fine-grain structure
- Even cobalt distribution
- No pores or impurities
- High-density structure
- Excellent hardness
- Extended tool life and high wear resistance
Competitor’s Inferior Recycled Carbide:
- Mixed grain sizes
- Irregular cobalt distribution
- Many pores and impurities
- Loose structure and low density
- Higher risk of edge chipping
- Unstable tool life and cutting performance
Advanced Coating Technology
- Advanced coatings supplied by Oerlikon Balzers.
- Different coating solutions for steel, stainless steel, aluminum, and hardened material.
- Excellent resistance to wear, heat, and oxidation.
- Maintaining stable cutting and smooth chip removal in CNC machining.
High-quality Coating vs Poor Coating
JINOO Premium coatings used in our end mills:
- Strong adhesion
- No peeling in scratch testing
- Uniform coating thickness
- Dense structure without pores
- Consistent surface quality
Competitor’s Inferior Coatings used in low-grade end mills:
- Weak adhesion and easily peeling
- Uneven coating thickness
- Loose structure
- Poor surface quality
- Unstable machining performance
International Certifications
- ISO9001:2008 Certified
- ISO9001:2015 Certified
- SGS Qualified Manufacturer
- TÜV Rheinland Qualified Manufacturer
- Alibaba.com Verified Supplier
- Made-in-China Verified Supplier
- 1688 platform Verified Supplier
- National High-tech Enterprise
- Changzhou High-tech Product Certification
These international certifications demonstrate our manufacturing capability. We always commit to improving quality and meeting customers’ demands.
Reliable Technical Support
- Tool selection suggestions based on workpiece materials.
- Professional cutting parameter optimization.
- Reliable regrinding and resharpening services. You can reduce costs significantly.
- All the bull nose end mills are supplied directly from our own factory.
Testimonials
“JINOO bull nose end mills help us improve the efficiency of roughing machining. When under high-load conditions, their tools can ensure superior edge strength and stability. After using JINOO milling tools, we reduce edge chipping and extend tool life. Moreover, bull nose end mills for semi-finishing show consistent performance and reduce our costs. I will buy large quantities of end mills from JINOO.”
David MillerProduction Manager
Company & Service
Does JINOO provide customized services for bull nose end mills?
Yes! JINOO can provide customized services for solid carbide bull nose end mills. Additionally, we can optimize tool geometry based on your machining demands.
- Our customized services cover: tool diameter, flute length, overall length, corner radius size, helix angle, coating type, and shank specification.
- Our engineering team offers geometry optimization according to different machining conditions, including roughing, semi-finishing, slotting, and hardened materials processing.
- For complex applications, we also offer cutting suggestions, testing supports, and tool optimizations to ensure customized bull nose end mills match your actual machining conditions
What is your MOQ and lead time?
About MOQ:
- For standard solid carbide bull nose end mills, the minimum order quantity is only 1 piece.
- For customized milling tools, the MOQ depends on the specific tool design.
About lead time:
- For standard bull nose end mills, the lead time is usually 5-12 working days.
- For non-standard end mills, the lead time depends on the tool design. After confirming the drawing and specifications, we will provide a clear delivery time.
Does JINOO provide samples?
Yes. We can provide paid samples of bull nose end mills for testing.
- Customers can test tool cutting performance, machining stability, surface finish, and tool life in actual CNC machining.
- Sample testing helps you reduce the risk of tool selection before bulk purchasing.
- If you have any questions, please feel free to contact us. We can offer test plans and application suggestions based on specific materials and processing conditions.
What are the shipment methods and payment methods?
For shipment methods:
- JINOO supports both air freight and sea freight for bull nose end mills and other carbide milling cutters.
- We cooperate with international logistics companies, including FedEx, DHL, and UPS, to ensure punctual delivery.
- All the bull nose end mills will be packed with shockproof and waterproof protection.
- Shipment methods can be adjusted according to order urgency.
For payment methods:
- We support bank transfer, credit cards, and PayPal.
- Additionally, we can also adjust the payment terms through consultation.
The main difference between bull nose end mills and ball nose end mills lies in their geometric design and applications.
Geometry:
- The tip of a ball nose end mill is spherical.
- In contrast, bull nose end mills have a flat bottom and a corner radius design.
Application:
- Ball nose end mills are suitable for machining complex curved surfaces and high-precision contouring.
- Bull nose end mills are suitable for flat milling, side milling, and roughing.
Machining Efficiency:
- The cutting speed at the center of ball nose end mills is nearly zero. So they are more suitable for finishing rather than high material removal rate machining.
- Bull nose end mills can cut materials at high speed because they have a larger effective cutting area.
Features:
- Ball nose end mills can achieve continuous curved surface performance and a high-quality surface finish.
- Bull nose end mills provide edge strength, machining stability, and long tool life.
In real processing scenarios, ball nose end mills and bull nose end mills are usually used together.
Compared with flat end mills, bull nose end mills are suitable for machining conditions that require high edge strength and high processing stability. Flat end mills are suitable for acute angle machining and 90° shoulder machining.
You should choose bull nose end mills under the machining conditions below:
- High feed rate or high load machining
- Hardened materials and discontinuous cutting
- Demands for longer tool life (corner radius design can distribute cutting force and reduce edge chipping)
In conclusion, bull nose end mills can deliver stable machining and longer tool life.
With a corner radius design, bull nose end mills can distribute cutting force and reduce edge chipping. Moreover, fine edge passivation and advanced coatings can improve wear resistance and extend tool life.
You can improve the life of bull nose end mills through the following suggestions:
- Set appropriate cutting parameters: Avoid high feed rates and excessively deep cutting depths.
- Choose suitable coatings: Different materials are suitable for different coatings. High-temperature-resistant coatings, such as AlTiN, are suitable for steel machining. Anti-adhesion coatings, such as DLC, are suitable for aluminum machining.
- Control overhang length.
- Maintain stable clamping
- Ensure smooth chip evacuation
In fact, tool failure is often the result of the combined effects of impact, vibration, and heat.
The choice of corner radius depends on the specific machining type:
- A small corner radius (0.2 – 0.5 mm): suitable for contour finishing.
- A medium corner radius (0.5 – 1.5 mm): suitable for general machining and mold machining.
- A large corner radius (2 mm+): suitable for heavy cutting, high load machining, and high rigidity machining.
You can remember that:
- A larger corner radius provides higher rigidity and better stability.
- A smaller corner radius provides higher precision.
- The size of the corner radius should match the tool diameter and machining allowance.
In CNC machining, bull nose end mills of medium corner radius are commonly used. Because they balance rigidity and machining efficiency.
Contact our sales team or sign in to find out about all your pricing options.
ABOUT US
Since 2006, JINOO Tools Group has committed to manufacturing solid carbide bull nose end mills. As a National High-Tech Enterprise, our factory covers an area of over 35,000 square meters.
Supported by an experienced engineering team, we continue to innovate tool geometry and machining technology to meet global customers’ demands. Our bull nose end mills are widely used in automotive, aerospace, and electronic industries. With more than 50 national patents and ISO 9001 certifications, we can provide professional cutting solutions with lasting value.
Product Catalog
Application Scenarios
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