Sutton Viper D105 11.5mm HSS Jobber Drill Bit

The Sutton Viper D105 is an 11.5mm high speed steel jobber drill bit, made to DIN338 dimensions and sold carded as a single bit. The 11.5mm size is a precise step between the 11mm and 12mm standards, often used to open out a hole to an exact size for a threaded rod or a close fit bolt. The Viper point is a 118 degree split point that self centers on the mark 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 11.5mm diameter
• Less pressure required when drilling
• Suits machine and hand held drilling
• Carded single bit

Specifications

• Diameter: 11.5mm
• Type: HSS jobber drill bit, DIN338
• Model: D105
• Point: 118 degree split point, self centering
• Materials: steel, aluminium, brass, wood and plastics

Applications

• Opening holes out to exact sizes in steel
• Clearance work for threaded rod and close fit bolts
• Drilling steel, aluminium and brass
• Heavy fabrication and maintenance

What You Need To Complete The Job

At this size a drill stand or a firm hand hold gives the cleanest result, with cutting oil on steel. For masonry work, switch to an SDS masonry drill, and keep leather rigger gloves on when handling metal. The wider range is in General Hand Tools.

Frequently Asked Questions

Does this bit suit aluminium?

Yes. Aluminium drills quickly with an HSS bit at a moderate speed with a light oil. Keep the flutes clear and feed steadily so the soft metal does not load up on the cutting edge, and the hole stays clean without burrs.

Why use an 11.5mm bit instead of 11mm or 12mm?

An 11.5mm HSS bit gives a precise clearance for M11 fixings and threaded rod where an 11mm is tight and a 12mm is loose. It is the exact size step for close fit work.

How do I keep an 11.5mm hole straight?

Start with the self centering point, then keep the drill square to the work as you feed. For the straightest result use a drill stand, or drill a smaller pilot first and open it out.

Will this bit drill aluminium plate without binding?

Yes, with a light oil and a steady feed. Aluminium cuts quickly at this size, so keep the flutes clear and do not let the bit dwell in the hole or it will load up.

Is this size worth having in a kit?

If you work with threaded rod, close fit bolts or imperial conversions, yes. It is a niche size that saves the day when nothing else fits the clearance you need.