Drill bit Irwin 10502566 twist drill bit, diameter 11 mm, 1 pc

Irwin 10502566 is a single 11 mm twist drill bit designed for general drilling tasks in metalworking and other common materials. Manufactured to DIN 338 standards and made with HSS cobalt-grade steel containing 5% cobalt, this drill bit provides improved heat and abrasion resistance compared with standard high-speed steel bits. Supplied as one piece, the bit features a heavy-duty web for greater strength and a 135° split point that reduces walking and starts the cut more reliably on a range of surfaces.

Advantages

The HSS cobalt composition with 5% cobalt increases thermal stability and wear resistance for prolonged life under higher cutting temperatures. The heavy-duty web construction enhances bit rigidity and reduces the risk of breakage during demanding drilling operations. The 135° split point geometry ensures fast centring and reduced walking on the workpiece, improving hole accuracy and reducing the need for pilot holes. Conformity to DIN 338 ensures consistent dimensions and performance for workshop and industrial use.

Suitable for

• Drilling holes in carbon and alloy steels, including heat-treated and hardened steels
• General metalworking tasks where durability and heat resistance are required
• Drilling into wood and plastics when using a compatible drill and appropriate cutting parameters
• Use in handheld drills and drill presses with suitable chuck capacity for 11 mm shanks

Key specifications

• Type: Single twist drill bit (HSS Cobalt)
• Diameter: 11 mm
• Material: High-speed steel with 5% cobalt
• Point angle: 135° split point for reduced walking
• Standard: Manufactured to DIN 338
• Construction: Heavy-duty web for increased strength
• Quantity: 1 piece

How to use

Secure the 11 mm drill bit in a compatible drill chuck, ensuring it is clamped straight and tight. Select appropriate cutting speeds and feed rates for the material: use lower speeds and steady feed for hard or heat-treated metals, and higher speeds for softer metals, wood or plastics. Apply cutting fluid or coolant when drilling metals to reduce heat build-up and extend bit life. Start drilling with light pressure until the split point locates the hole, then apply steady, controlled pressure through the cut. Clear chips frequently to avoid clogging and overheating.

Usage recommendations

Use proper personal protective equipment (safety glasses, gloves) and a drill press or secure clamping for greater accuracy when possible. For maximum life when drilling hardened steels, maintain coolant flow and avoid excessive dwell at the hole bottom. Replace the bit when wear or chipping on the cutting lips compromises hole quality.