Carlyle 4mm HSS Cobalt 5% Drill Bit (CBD4)
£2.39 inc. VAT
24 in stock
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- 4mm cobalt drill bit
- Everyday middle size
- 130-degree split point
Description
Genuine Carlyle · Part no. CBD4
Carlyle CBD4 is a 4mm cobalt HSS drill bit, M35 steel with 5% cobalt, ground to DIN 338 and finished with a 130-degree split point that centres itself. 4mm is a middle size you use often: opening up pilot holes, drilling for fixings, and making mounting holes in brackets, sheet steel and stainless.
Good to know
- How fast should I run a 4mm bit in steel? A medium speed with firm pressure; if the tip turns blue or squeals, slow down and add cutting fluid.
- Will it drill hardened steel? Cobalt handles stainless and tough steels well, but very hard parts such as springs or bearing races can still defeat it.
- How do I keep the hole where I marked it? Make a small centre punch mark; the split point then starts without walking off the line.
Which one?
The Carlyle 4.2mm HSS Cobalt 5% Drill Bit (CBD42) is the M5 tapping size just above, and the Carlyle 3.5mm HSS Co5 Drill Bit 3.5mm (CBD35) is just below.
Key features
- 4mm HSS cobalt drill bit
- 130-degree split point
- M35 steel, 5% cobalt
- Precision ground to DIN 338
- Longer life than plain HSS
Specification
| Brand | Carlyle |
| Part number | CBD4 |
| Barcode (EAN) | 5063485283721 |
| Weight | 0.01 kg |
| Packed size | 225 x 50 x 8 mm |
| Detail | DIN338 |
| Diameter | 4mm |
| Material | M35 HSS, 5% cobalt |
| Point | 130-degree split point |
| Standard | DIN 338 |
Additional information
| Weight | 0.008 kg |
|---|
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