Specifications

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

GOST  GOST 886-77 Long Series Fully Ground HSS Twist Drill Bit  

Specification:

1. Standard:	GOST 886-77(DIN340, long series)
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:	Fully Ground
5. Point angle	118 degree or 135 degree split point
6. Surface     finishing:	Bright finishing;Tin-coated; or customization
7.Application:	For drilling cast steel, malleable iron, sintered metal, non-ferrous metal etc. Surface finishing will highly improve the drill bit’s life span.

8. Size:              1mm-13mm 

 

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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