Carlyle 7mm HSS Cobalt 5% Drill Bit (CBD7)

Description

Genuine Carlyle · Part no. CBD7

Carlyle CBD7 is a 7mm HSS cobalt drill bit to DIN 338, in M35 steel with 5% cobalt and with a 130-degree split point for a fast, centred start. A 7mm hole suits larger fixings, cable and pipe clips, bracket holes and drilling out sheared bolts before using an extractor, in mild steel or stainless.

Good to know

• Can I use it to drill out a broken bolt? Yes, a cobalt bit is the right choice for that; centre punch the bolt, start small and step up, and check the extractor's instructions for the hole size.
• What speed suits a 7mm bit? Slow to medium in steel and slower still in stainless, with cutting fluid; bigger bits want less speed.
• How do I keep it sharp? Don't let it rub without cutting, and stop to clear swarf from deep holes.

Which one?

For a slightly smaller hole, the Carlyle 6.5mm HSS Cobalt 5% Drill Bit (CBD65) is next down, and the Carlyle 7.5mm HSS Cobalt 5% Drill Bit (CBD75) is next up.

Key features

• 7mm HSS cobalt drill bit
• 130-degree split point
• M35 steel with 5% cobalt
• DIN 338
• Works in mild steel and stainless

Specification