Specifications

1.High speed steel Material.
2.Strict heat treatment
3.Precisely Processing.

GOST 14952-75 Type B Combined Center Drill Bit  

 

Specification:

1. Standard:	OST 14952-75 (DIN standard is also available)
2. Material:	HSS 4241(W4Mo2Cr4V), HSS 4341(W4Mo3Cr4V), HSS 6542(W6Mo5Cr4V2), M35 (W6Mo5Cr4V2Co5)
3. Hardness:	HSS4241: HRC59-61, HSS4341:HRC63-64, HSS 6542:64-65, HSS M35:HRC 66-67
4. Processing:	Milled/Fully ground
5. Point angle	120 degree
6. Surface     finishing:	Bright finishing;Tin-coated
7.Application:	can be used in lathes to make centre holes.

8. Size:              

 

Ø1	Ø2	L1	L2
MM	MM	MM	MM
1	4	37.5	1.9
1.25	5	42	2.2
1.6	6.3	47	2.8
2	8	52.5	3.3
2.5	10	59	4.1
3.15	11.2	63	4.9
4	14	70	6.2
5	18	78	7.5
6.3	20	83	9.2
8	25	103	11.5
10	31.5	128	14.2

  

The quality of HSS tools are basically decided by HSS raw material and heat treatment. We can keep a strict control of these procedure.

  

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