Carlyle 8mm HSS Cobalt 5% Drill Bit (CBD8)

Description

Genuine Carlyle · Part no. CBD8

Carlyle CBD8 is an 8mm drill bit in cobalt HSS (M35, 5% cobalt) to DIN 338. Like the larger bits in the range it has a three-flat shank so it won't spin in the chuck, plus a 130-degree split point. 8mm is a common size for bolt holes, bracket mounting and opening up holes in steel and stainless.

Good to know

• Why does the shank have flats? Three flats give the chuck something to bite on, so the bit stays put when it digs in.
• How do I drill an 8mm hole cleanly in steel? Pilot drill first, clamp the work, run at a low speed with cutting fluid and ease off as the bit breaks through.
• Will an M8 bolt pass through an 8mm hole? It will be too tight; for a medium fit an M8 bolt needs a 9mm hole.

Which one?

For an M8 clearance hole, the Carlyle 9mm HSS Cobalt 5% Drill Bit (CBD9) is the size. For M10 tapping, use the Carlyle 8.5mm HSS Cobalt 5% Drill Bit (CBD85).

Key features

• 8mm HSS cobalt drill bit
• Three-flat shank grips firmly in the chuck
• 130-degree split point
• M35 steel with 5% cobalt
• DIN 338

Specification