Irwin twist drill bit 4.5 mm, model 10502551, 1 piece

Irwin twist drill bit with a 4.5 mm diameter is a single-piece, general-purpose HSS cobalt bit designed for drilling a variety of metals and other common materials. The 5% cobalt alloy and heavy-duty web construction improve heat and wear resistance while preserving rigidity during demanding drilling tasks. The 135° split point reduces bit walking and starts cutting quickly, making the bit suitable for both hand-held and machine drills with standard chucks.

Advantages

The 5% cobalt composition provides enhanced resistance to heat and abrasion compared with standard high-speed steel bits, extending life in applications that generate elevated temperatures. The heavy-duty web increases bit strength and reduces breakage risk under side load, while the 135° split point ensures accurate positioning and immediate cutting action. Cylindrical shank design ensures compatibility with conventional drill chucks and straightforward clamping.

Suitable for

• Drilling alloyed and hardened steels
• Drilling stainless steel and other tough metals
• General metalworking tasks in workshops and production environments
• Occasional drilling in wood and engineering plastics when a metal-capable bit is required

Key specifications

• Bit type: Twist drill
• Diameter: 4.5 mm
• Overall length: 80 mm
• Material: High-speed steel with 5% cobalt
• Point geometry: 135° split point for reduced walking
• Shank type: Cylindrical shank for standard chucks
• Pack quantity: 1 piece

How to use

Secure the cylindrical shank in a properly sized chuck and tighten firmly. Select suitable cutting speed and feed rate for the work material—lower speeds for hardened or stainless steels to reduce heat build-up. Use cutting fluid or coolant when drilling metals to extend bit life and improve chip evacuation. Apply steady, moderate pressure and avoid forcing the bit; retract periodically for chip clearance when drilling deep holes.

Usage recommendations

For best results on hardened or stainless steels, use reduced spindle speed, a quality cutting fluid, and light pecking cycles to control temperature and chip removal. Inspect the bit for dulling or chipping before use and replace when wear affects hole accuracy or increases torque. Store the bit in a protective case to prevent damage to the cutting edges.