high quality 170 pcs hss twist cobalt drill bit set
- Category: Power Tool Accessory >>>
- Supplier: Danyang Daming Import & Export Co. Ltd.
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Product Overview
Description
Product Description
HSS twist drill set-170pcs set ,170 piece good quality drill bit set in metal case
1, For metal, pvc , plastic ,aluminium
2, HSS Twist drill bits (made from High Speed Steel)
3,Standars: DIN338,DIN1897,DIN340,DIN1869,DIN345,DIN333
4,Process:roll forged,rolled polished(half fully ground) ,fully ground ,milled
10pcs-1.0mm 10pcs-1.5mm 10pcs-2.0mm 10pcs-2.5mm 10pcs-3mm
10pcs-3.5mm 10pcs-4mm 10pcs-4.5mm 10pcs-5mm 10pcs-5.5mm
10pcs-6mm 10pcs-6.5mm 10pcs-7mm 10pcs-7.5mm 10pcs-8mm
5pcs-8.5mm 5pcs-9mm 5pcs-9.5mm 5pcs-10mm
|
Material |
HSS4341, HSS4241 |
| Workmanship | Rolled |
| Surface coating | 1. Black finished |
| 2. Edge ground | |
| 3. Edge ground Tin-coated | |
| 4. Fully ground bright | |
| 5. Fully ground black finished | |
| 6. Fully ground Tin-coated. | |
| Angle point | 118 degree angle point |
HSS Drill bits are available in :
High speed steel (HSS): harder than steel blades; stay sharper longer.
HSS Cobalt: Extremely hard and dissipate heat quickly. They are most commonly used for boring in stainless steel and other metals.
We can supply the following HSS grade:
| HSS GRADE | HRC | CHEMICAL COMPOSITION (%) | International | DIN | ASTM | JIS | ||||
| C | W | Mo | Cr | V | ||||||
| W4Mo2Cr4VSi(4241) | 60-62 | 0.9-1.0 | 1.5-2.5 | 0.5-1.2 | 3.8-6.0 | 0.5-1.0 | T-4241 | / | / | / |
| W4Mo3Cr4V(W4341) | 62-65 | 0.88-0.98 | 3.5-4.5 | 2.5-3.5 | 3.8-4.4 | 1.3-1.7 | 4341 | W4 | / | / |
| W9Mo3Cr4V(W9341) | 63-66 | 0.77-0.87 | 8.5-9.5 | 2.7-3.3 | 3.8-4.4 | 1.3-1.7 | 9341 | W9 | / | / |
| W6Mo5Cr4V2(M2) | 63-66 | 0.8-0.9 | 5.5-6.75 | 4.5-5.5 | 3.8-4.4 | 1.75-2.2 | 6542 | M2 | M2 | SKH51 |
| W6Mo5Cr4V2Co5(M35) | 64-67 | 0.9-0.95 | 5.5-6.5 | 4.5-5.5 | 3.8-4.4 | 1.75-2.2 | Co5% | M35 | M35 | SKH55 |
| W2Mo9Cr4V Co8 (M42) | 66-68 | 1.05-1.15 | 1.15-1.85 | 9.0-10.0 | 3.5-4.25 | 0.95-1.35 | Co8% | M42 | M42 | SKH59 |
Standard HSS drill bit:
| Roll Forged | a.DIN338 b,DIN340 c, Jobber Length |
| Harf Ground | a.DIN338 b.DIN340 c.DIN1897 d.Jobber Length |
| Fully Ground | a.DIN338 b,DIN340 c,DIN1897 d,Aircraft Extension e, Jobber Length |
| f,Taper Length g,Screw Machine Length | |
| Milled | a.DIN340 b,DIN1869 c,Aircraft Extension d,Extra Length |
We can supply the following standard HSS drill bit.
118 and 135 split point
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