Twist drill bit Irwin 10502556, diameter 5.5 mm, 1 pc

Irwin twist drill bit 10502556 with a 5.5 mm diameter is a single-piece HSS cobalt drill designed for precise metal drilling tasks. Engineered to DIN 338 standards, this bit combines a 5% cobalt alloy and heavy-duty web construction to deliver increased heat and abrasion resistance. The 135° split point geometry reduces bit walking and starts cutting immediately, making it suitable for demanding workshop and industrial applications where clean, accurate 5.5 mm holes are required.

Advantages

The 5% cobalt composition improves high-temperature performance and wear resistance compared with standard high-speed steel, extending service life during repeated metal drilling. Heavy-duty web construction increases strength and durability under load, while the 135° split point provides fast penetration with reduced wandering at the drill start. Manufactured to DIN 338 standards, the bit offers consistent geometry and reliable dimensions for repeatable results.

Suitable for

• Drilling alloyed steel and hardened metals
• Working with stainless steel components
• General metal fabrication, repair and installation tasks requiring 5.5 mm holes

Key specifications

• Type: Twist drill bit
• Diameter: 5.5 mm
• Overall length: 93 mm
• Material: High-speed steel with 5% cobalt
• Point angle/geometry: 135° split point
• Shank: Cylindrical shank
• Quantity: 1 piece
• Standards: Manufactured to DIN 338

How to use

Secure the workpiece and select an appropriate drill speed for the material being drilled; lower speeds are recommended for stainless and hardened steels. Mount the 5.5 mm Irwin twist drill bit in a compatible drill chuck, ensuring the cylindrical shank is clamped firmly. Use steady, even feed pressure and allow the tool to cut without excessive force. Periodically withdraw the bit to clear chips and, when drilling hard or heat-sensitive materials, apply suitable cutting fluid to reduce heat buildup and extend tool life.

Usage recommendations

For best results when drilling alloyed or hardened steels, use moderate cutting speeds, adequate coolant or cutting oil, and avoid excessive axial force. Re-sharpening can restore cutting performance when wear affects the split point geometry.