Sutton Viper D105 12.5mm HSS Jobber Drill Bit

The Sutton Viper D105 is a 12.5mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. The 12.5mm size is the imperial half inch dressed in metric, a common clearance and opening out size on sites that work in both systems. The Viper point is a 118 degree split point that self centers on the mark, starts clean, and cuts up to 2 times faster than a conventional HSS bit.

Key Features

• Viper point design delivers up to 2 times faster drilling than conventional HSS bits
• 118 degree self centering split point
• DIN338 HSS jobber geometry in a 12.5mm diameter
• Less pressure required when drilling
• Suits machine and hand held drilling
• Carded single bit

Specifications

• Diameter: 12.5mm
• Type: HSS jobber drill bit, DIN338
• Model: D105
• Point: 118 degree split point, self centering
• Materials: steel, aluminium, brass, wood and plastics

Applications

• Clearance holes for half inch bolts and metric equivalents
• Opening holes out in structural steel
• Drilling steel, aluminium and brass
• Heavy fabrication and maintenance

What You Need To Complete The Job

A 12.5mm bit is a big cut for a hand drill, so use a drill with torque and a firm hold. For masonry work, switch to an SDS masonry drill, and keep leather rigger gloves on when handling cut metal. More cutting gear is under General Hand Tools.

Frequently Asked Questions

What speed should I use for a 12.5mm bit in steel?

Use a slow to moderate speed with a firm, steady feed and plenty of cutting oil. Big HSS bits cut best at low revs with real pressure; spinning them fast just burns the edge without cutting any faster.

Is 12.5mm the same as half an inch?

Yes. A 12.5mm drill bit matches a 1/2 inch bit, so it suits imperial fasteners as well as metric work. It is a handy size on sites that mix both systems.

What speed should I run a 12.5mm bit at?

Use a slow to moderate speed with a firm, steady feed and cutting oil on steel. Big HSS bits cut best at low revs with real pressure; spinning them fast just burns the edge.

Can I drill stainless with this bit?

It will drill stainless with a slow speed, firm steady pressure and plenty of lubricant. Stainless work hardens, so keep the bit cutting; if it rubs, it dulls fast.

Is a 12.5mm bit good for timber work?

Yes, it clears holes in heavy timber for half inch bolts and coach screws. Drill with a steady feed and back the bit out to clear sawdust and avoid burning the wood.