Carlyle 4.5mm HSS Cobalt 5% Drill Bit (CBD45)

Description

Genuine Carlyle · Part no. CBD45

The Carlyle CBD45 is a 4.5mm drill bit in M35 cobalt high speed steel (5% cobalt) to DIN 338, with a 130-degree split point. 4.5mm is the medium-fit clearance hole for an M4 bolt or screw, so it is the size to reach for when bolting small brackets, clips or plates together through steel or stainless.

Good to know

• What is a clearance hole? A hole the bolt passes through without threading; for an M4 bolt a 4.5mm hole gives a medium fit with a little room to line parts up.
• Should I drill a pilot first? In thick steel a small pilot helps, though the split point lets this size start on its own in thinner metal.
• How do I deburr the hole? Twist a bigger bit lightly by hand in the hole, or use a deburring tool, so the sharp edge doesn't cut wiring or skin.

Which one?

For a slightly tighter hole, the Carlyle 4.2mm HSS Cobalt 5% Drill Bit (CBD42) is the M5 tapping size, and the Carlyle 5mm HSS Cobalt 5% Drill Bit (CBD5) is next up.

Key features

• 4.5mm HSS cobalt drill bit
• Medium clearance size for M4
• 130-degree split point
• M35 steel with 5% cobalt
• DIN 338

Specification