Sutton Viper D105 8.5mm HSS Jobber Drill Bit

The Sutton Viper D105 is an 8.5mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. The 8.5mm size is the practical in between step for clearance and pilot work where an 8mm hole is too tight, and it is a common choice before opening out to 9mm or 10mm. 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 an 8.5mm diameter
• Less pressure required when drilling
• Suits machine and hand held drilling
• Carded single bit

Specifications

• Diameter: 8.5mm
• 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 10mm bolts and fasteners
• Opening holes out in metal work
• Drilling steel, aluminium and brass
• General fabrication and maintenance

What You Need To Complete The Job

An 8.5mm bit wants a drill with torque and a steady feed. When the job is masonry, switch to an SDS masonry drill, and keep leather rigger gloves on when handling cut metal. The wider cutting range is in General Hand Tools.

Frequently Asked Questions

Can I drill timber with an HSS bit?

Yes. An HSS bit drills timber cleanly, especially at small and medium sizes. For the odd hole in timber an HSS bit is fine; for lots of timber work a dedicated wood bit clears sawdust better and keeps a cleaner cut. Either way, back the bit out regularly on deep holes.

Why is an 8.5mm size useful?

An 8.5mm HSS bit covers the gap between 8mm and 9mm, which is handy for M8 fixings that need a touch more clearance and for opening out a hole to a true size before tapping or reaming.

Will this bit handle mild steel plate?

Yes. At 8.5mm the bit is stiff enough for plate steel. Use a moderate speed, a steady feed and cutting oil, and drill a smaller pilot first if the plate is thick.

Can I use it with a magnetic drill stand?

A drill stand is a good match for this size because it holds the drill square and lets you feed steadily. The DIN338 shank fits a standard chuck, so it works with most drill stands.

How do I avoid a burred exit hole?

Ease off the pressure as the point breaks through the back of the metal. Backing the work with a piece of scrap timber also supports the material and gives a clean exit.