Sutton Viper D105 7.5mm HSS Jobber Drill Bit

The Sutton Viper D105 is a 7.5mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. The 7.5mm size sits between the common 7mm and 8mm steps and is used for pilot and clearance holes where a 7mm is too tight. The Viper point is a 118 degree split point that self centers on the mark, starts without walking, and drills up to 2 times faster than a conventional HSS bit with less pressure on the drill.

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 7.5mm diameter
• Less pressure required when drilling
• Suits machine and hand held drilling
• Carded single bit for the toolbox

Specifications

• Diameter: 7.5mm
• Type: HSS jobber drill bit, DIN338
• Model: D105
• Point: 118 degree split point, self centering
• Materials: steel, aluminium, brass, wood and plastics

Applications

• Pilot holes for 8mm and 10mm fasteners
• Opening holes out in metal work
• Drilling steel and aluminium
• General fabrication and maintenance

What You Need To Complete The Job

A 7.5mm bit suits a corded drill or a strong 18V cordless, run with a steady feed and a little oil on steel. For concrete and brick, use an SDS masonry drill instead, and keep leather rigger gloves on for handling metal. More cutting gear is under General Hand Tools.

Frequently Asked Questions

Should I oil the bit when drilling steel?

A little cutting oil on the point keeps the edge cool, reduces friction and makes the cut smoother in steel. On aluminium a light oil stops the flutes loading up, and on brass a gentle feed with oil avoids digging in. It is cheap insurance for the life of the bit.

Why would I choose a 7.5mm bit?

A 7.5mm HSS bit is the size to reach for when a 7mm clearance is too tight and an 8mm is too loose. It is a common pilot for 8mm bolts and for opening out holes in a fabrication run.

Will this bit drill mild steel without a pilot?

Yes. The self centering split point lets you start a 7.5mm hole directly in mild steel without piloting first. On thicker plate, drilling a smaller pilot first gives a straighter final hole and puts less strain on the bit.

How should I lubricate the cut?

A light cutting oil or spray lubricant on the point keeps the edge cool and the cut smooth in steel. On aluminium and brass a drop of oil stops loading up; keep the feed gentle on brass.

Can I use this in an impact driver?

No, use a drill. An impact driver is not built for drilling and will hammer the cutting edge. This bit is designed for a corded or cordless drill or a pillar drill.