Sutton Viper D105 7.0mm HSS Jobber Drill Bit

The Sutton Viper D105 is a 7.0mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. At 7mm the bit has enough body for solid, straight holes in steel and aluminium, and it is a common pilot size for 8mm and larger fasteners. 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 7.0mm diameter
• Reduced drilling pressure for better control
• Suits machine and hand held drilling
• Carded single bit

Specifications

• Diameter: 7.0mm
• 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 M7 and M8 bolts
• Pilot holes for 8mm and 9mm fasteners
• Drilling steel, aluminium and brass
• Timber and plastic drilling on site

What You Need To Complete The Job

Run a 7.0mm bit in a drill with decent torque, and use a cutting lubricant when drilling steel. For masonry fixing, swap to an SDS masonry drill, and when you need to open a hole out further a pilot drill is the right next step. The full range is in General Hand Tools.

Frequently Asked Questions

Why does a split point drill faster?

The 118 degree split point cuts at the centre of the bit, so it bites into the surface immediately instead of skidding. That means less time spent starting the hole, less pressure on the drill, and a straighter result, which is why the Viper point drills up to 2 times faster than a conventional HSS bit.

What is a 7mm drill bit used for?

A 7mm HSS bit is the common clearance size for M7 bolts and a pilot size for M8 and M10 fixings. It is also used for drilling steel brackets, lock hardware and general fabrication work.

How much pressure do I need?

Not a lot. The split point does the starting work, and at 7mm the bit is stiff enough to feed steadily without much force. Too much pressure at the point of breakthrough can grab, so ease off as the bit exits.

Can I drill timber and metal with the same bit?

Yes. The HSS bit drills both, though it cuts timber much faster. For repeated timber work a dedicated wood bit clears sawdust better, but for the odd hole this Viper bit is fine.

Is a 7mm bit good for stainless steel?

It will drill stainless with a slow speed, steady feed and plenty of lubricant. Stainless work hardens, so keep the bit cutting rather than rubbing, and let it do the work.