Solid Carbide Twist Drill Bits with Inner Coolant Hole

• Customization: Available
• Customized: Customized
• Standard: DIN, JIS, AISI
• Model NO.: metric and inch
• Length: Jobber-length
• Type: Twist Drill Bit
• Material: Tungsten Carbide
• Usage: Metal Drilling
• Size: 0.5mm to 20mm
• Work Type: External Work
• Transport Package: Plastic Box
• Specification: 0.5mm to 20mm
• Trademark: stc
• Origin: Zhenjiang
• HS Code: 82075090
• Production Capacity: 100000PCS/Year

Product Description

Our solid carbide drill bits are made from high quality carbide  by Germany or Italy machinery  machineries.
Hardness 90-91hra. 

kinds of coating avialable on request.

DIN, JIS,ISO, GOST available on request.


GOST 17275
 

d	l	L		d	l	L		d	l	L		d	l	L
3	24	55		5.5	40	75		8	52	95		10.2	60	105
3.2	24	55		5.8	40	75		8.2	52	95		10.5	60	105
3.5	28	60		6	40	75		8.5	52	95		10.8	65	110
3.8	30	63		6.2	42	80		8.8	55	100		11	65	110
4	30	63		6.5	42	80		9	55	100		11.2	65	110
4.2	30	63		6.8	45	85		9.2	55	100		11.5	65	110
4.5	32	65		7	45	85		9.5	60	105		11.8	65	110
4.8	36	70		7.2	45	85		9.8	60	105		12	70	120
5	36	70		7.5	45	85		10	60	105
5.2	36	70		7.8	52	95