Carlyle 4.2mm HSS Cobalt 5% Drill Bit (CBD42)

Description

Genuine Carlyle · Part no. CBD42

Carlyle CBD42 is a 4.2mm cobalt drill bit, the tapping drill size for M5 threads. It is M35 high speed steel with 5% cobalt, made to DIN 338, with a 130-degree split point, so it suits tapping M5 threads in brackets, plates and panels, and drilling steel or stainless where plain bits struggle.

Good to know

• Which tap do I use after drilling? An M5 tap in the standard coarse pitch; drill square, then tap with cutting fluid, backing off every turn to clear the swarf.
• Can I use 4.2mm as a clearance hole? No. A 4.2mm hole is for cutting an M5 thread into; a bolt passing through needs a bigger hole.
• Does the cobalt help here? In hard or stainless metal it keeps cutting cleanly where a plain HSS bit would blunt part way through the job.

Which one?

For an M5 bolt to pass through, the Carlyle 5.5mm HSS Cobalt 5% Drill Bit (CBD55) gives a medium clearance hole. For M6 tapping, use the Carlyle 5mm HSS Cobalt 5% Drill Bit (CBD5).

Key features

• 4.2mm HSS cobalt drill bit
• M5 tapping drill size
• 130-degree split point
• M35 steel, 5% cobalt
• DIN 338

Specification