Irwin
Irwin IRWIN® HSS Cobalt Drill Bit 4.2mm OL:75mm WL:43mm 10502549
Model 10502549
Best price
Lowest we’ve seenWhere to buy
| Retailer | Price | Availability | Visit |
|---|---|---|---|
| Cheapestchecked an hour ago | £3.24 | In stock | Visit Blueperry agriculture (UK) (opens in a new tab) |
 checked an hour ago | £3.49£4.50 | In stock | Visit Tooled Up (opens in a new tab) |
 retailer's price from 16 Jul 2026 | £4.36 | In stock | Visit Blueperry Tool & Builders Merchants (UK) (opens in a new tab) |
Prices exclude delivery. We may earn a commission if you buy through these links, which never affects the ranking above — it is always cheapest first.
Price history
Full price historyThis is the lowest price we have recorded. If you were waiting for a drop, this is it.
About this product
This Irwin HSS Cobalt drill bit has a 4.2mm diameter, giving precise sizing for clearance holes and technical fabrication work. It is suited to drilling stainless steel and other high alloys.
The body is made from HSS steel containing 5% Cobalt, which improves red hardness (heat resistance) and extends service life, allowing the cutting edge to be maintained under demanding drilling conditions. A 135° split point grinding ensures perfect centring without bit walk and reduces the drilling pressure needed for accurate hole placement.
The industrial quality ground flute design supports high accuracy drilling and fast chip removal, while a golden tempered surface finish reflects the heat treatment applied. Overall length is 75mm, with a working length of 43mm.
Features and Benefits
- :
- 4.2mm diameter for specialist clearance requirements
- 5% Cobalt for exceptional heat resistance
- Perfect centring with 135° split point grinding
- Extended life in stainless steel and high alloys Specifications: Tip Diameter (mm): 4.2 Working Length (mm): 43 Overall Length (mm): 75 Pack Qty.: 1
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