Sutton Viper D105 12.0mm HSS Jobber Drill Bit

The Sutton Viper D105 is a 12.0mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. Twelve millimetre is the standard clearance for M12 bolts and one of the largest jobber sizes you will use by hand. The Viper point is a 118 degree split point that self centers on the mark, starts clean without walking, and drills up to 2 times faster than a conventional HSS bit with less pressure.

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 12.0mm diameter
• Reduced drilling pressure for better control
• Suits machine and hand held drilling
• Carded single bit for the toolbox

Specifications

• Diameter: 12.0mm
• 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 M12 bolts and studding
• Pilot holes for M16 fixings
• Drilling steel, aluminium and brass
• Heavy timber and structural work

What You Need To Complete The Job

A 12.0mm bit needs a drill with serious torque and a firm, steady feed. For masonry, change to an SDS masonry drill, and when drilling steel at this size use a pilot drill first. The rest of the range is in General Hand Tools.

Frequently Asked Questions

How do I stop a large bit grabbing on breakthrough?

Ease off the pressure as the point breaks through the back of the metal, and let the flutes clear the hole. Drilling through to a scrap backing piece also supports the material and gives a clean exit without a big burr.

What is a 12mm drill bit used for?

A 12mm HSS bit is the standard clearance for M12 bolts and a common pilot for M16. It is a heavy fabrication size for structural steel, machine mounts and large brackets.

What drill do I need for a 12mm hole in steel?

Use a corded drill or a high output 18V cordless with a side handle. Run a moderate speed with cutting oil and let the bit cut at its own pace; forcing a 12mm bit is how edges burn.

Should I pilot a 12mm hole in thick plate?

Yes. Drill a 5mm or 6mm pilot first, then open it out to 12mm. That keeps the hole straight, reduces the load on the large bit, and gives a cleaner finish in plate steel.

Can I use this bit in a pillar drill?

Yes. The DIN338 shank fits a standard 13mm chuck and a pillar drill holds the speed steady. It is the best tool for accurate 12mm holes in heavier material.