Irwin Twist Drill Bit 8.5 mm 10502226, single-piece metal/drilling bit

Irwin Twist Drill Bit 8.5 mm (model 10502226) is a single-piece twist drill intended for general-purpose drilling in common workshop and construction tasks. With an 8.5 mm diameter and a total length of 117 mm, this drill bit is compatible with portable drills and drill presses. The tool is designed primarily for sheet metal work but is also suitable for drilling in various materials including metal, plastic and wood; it can be used on stainless steel with appropriate coolant and care.

Advantages

The solid, single-piece construction provides stable performance and reliable concentricity during drilling. The triangle shank improves grip in chucks and reduces slippage in standard drill holders. Its 8.5 mm cutting diameter and 117 mm length allow straightforward hole-making for common installations and fittings, while the geometry is tuned for effective cutting in sheet metal and general materials.

Suitable for

• Drilling holes in sheet metal and thin metal panels
• General metalworking tasks in workshops and construction sites
• Drilling in plastic components and assemblies
• Wood drilling for fixtures and pilot holes
• Applications requiring an 8.5 mm hole size

Key specifications

• Drill type: Twist drill bit, single-piece
• Diameter: 8.5 mm
• Overall length: 117 mm
• Shank type: Triangle shank
• Suitable materials: Metal, sheet metal, plastic, stainless steel (with coolant), wood
• Pack quantity: 1 piece

How to use

Secure the twist drill bit in a compatible chuck or holder that accepts a triangle shank, ensuring firm clamping to prevent slippage. Select an appropriate rotational speed for the material being drilled and apply steady, moderate feed pressure. For metal and sheet metal, use cutting lubricant to reduce heat and improve hole quality. When drilling stainless steel, use coolant and lower speeds to avoid work hardening. Withdraw the bit periodically to clear chips and prevent clogging.

Usage recommendations

Use appropriate personal protective equipment, clamp workpieces securely, and select correct speed and lubrication for the material. For extended life when drilling stainless steel or harder alloys, consider using specifically formulated HSS cobalt drills.