Drill bit Irwin Twist 3.5 mm 1 pc - model 10502546

Irwin Twist 3.5 mm drill bit is a single-piece, high-speed steel (HSS) cutting tool with cobalt enhancement designed for reliable 3.5 mm holes in a range of metals and general workshop materials. The twist geometry provides efficient chip evacuation while the heavy-duty web construction increases strength and reduces breakage risk. A 135° split point helps start holes precisely and reduces bit walking, making the bit suitable for handheld and machine drilling with standard chucks.

Advantages

The 5% cobalt composition increases heat and abrasion resistance compared with standard HSS, improving durability during continuous or heavy-duty metal drilling. The heavy-duty web construction and DIN 338 manufacturing standard ensure consistent concentricity and dimensional accuracy. The 135° split point reduces the need for center-punching and improves initial bite into the workpiece, while the twist flute geometry optimizes chip removal to reduce clogging and heat buildup.

Suitable for

• Drilling holes in tough and heat-treated steels and abrasive alloys
• Workshop maintenance and metal fabrication tasks
• Assembly operations requiring precise 3.5 mm holes
• Handheld drills and drill press use with standard chucks

Key specifications

• Cutting material: high-speed steel with 5% cobalt
• Diameter: 3.5 mm
• Point angle: 135° split point for reduced walking
• Flute type: twist (spiral) for chip evacuation
• Construction: heavy-duty web for increased strength
• Manufacturing standard: produced to DIN 338 dimensional and tolerancing guidelines

How to use

Secure the drill bit in a properly tightened standard drill chuck or compatible drill holder. For best results when drilling metal, clamp the workpiece to prevent movement, mark the drilling position and consider a light center punch if additional guidance is needed. Start at low speed to establish the hole, then increase speed appropriate to the material while applying steady, moderate feed pressure. Use cutting fluid when drilling hardened or abrasive metals to reduce heat, prolong bit life and improve chip evacuation. Withdraw the bit periodically for chip removal on deep holes.

Usage recommendations

Use this 3.5 mm Irwin HSS cobalt twist drill bit for demanding metalworking applications where increased heat and abrasion resistance are required. Maintain appropriate speeds and cutting fluid when working with hardened steels to maximize tool life and hole quality.