Drill bit Irwin 10502548 twist drill bit Ø4.1 mm, 1 pc

Irwin 10502548 twist drill bit Ø4.1 mm is a single-piece high-speed steel (HSS) cobalt drill designed for precision metal drilling. With a 4.1 mm cutting diameter and spiral flute geometry, this bit is manufactured to DIN 338 standards and built for demanding drilling tasks in alloyed and stainless steels. The 5% cobalt composition increases heat and abrasion resistance, while the heavy-duty web and 135° split point reduce walking and help the bit start cleanly on contact.

Advantages

The 5% cobalt HSS construction improves durability and retains hardness at elevated temperatures, extending tool life during high-speed and heavy-duty drilling. The heavy-duty web adds strength to resist breakage under axial load, and the 135° split point reduces thrust and provides fast penetration with minimal wandering. Spiral flute geometry efficiently evacuates chips to maintain cutting performance when working with metal.

Suitable for

• Drilling precise Ø4.1 mm holes in alloyed steel
• Drilling stainless steel components and fastener holes
• General metalworking and fabrication tasks requiring a 4.1 mm hole
• Use with standard hand drills and drill presses

Key specifications

• Drill diameter: 4.1 mm
• Overall length: 75 mm
• Material: HSS with 5% cobalt
• Point geometry: 135° split point
• Flute: spiral (twist) flute geometry for chip evacuation
• Shank type: cylindrical shank
• Packaging: single piece

How to use

Select an appropriate drilling speed and apply cutting fluid when drilling alloyed or stainless steels to reduce heat and improve chip removal. Secure the workpiece and align the drill bit with the marked center. Start drilling at low speed to establish the hole with the split point, then increase speed as appropriate while maintaining steady feed pressure. Withdraw periodically to clear chips when drilling deep holes and allow the bit to cool if it becomes excessively hot.

Usage recommendations

For best results, use this Irwin 4.1 mm HSS cobalt drill bit in combination with proper cutting lubricant and a stable drilling setup. Match drill speed to material hardness—lower speeds for hardened or stainless steels—and avoid excessive feed force to reduce risk of breakage. Replace the bit when wear or chipping degrades cutting performance.