Sutton Viper D105 3.5mm HSS Jobber Drill Bit

The Sutton Viper D105 is a 3.5mm high speed steel jobber drill bit, made to DIN338 and sold carded as a single bit. The Viper point is the reason to pick this over a plain HSS bit: the 118 degree split point self centers on the mark, drills noticeably faster than a conventional HSS bit, and needs less pressure on the drill. Sutton builds the range for machine and hand held drilling in steel, aluminium, brass, wood and plastics.

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 3.5mm diameter
• Less pressure required when drilling
• Suits machine and hand held drilling
• Carded single bit

Specifications

• Diameter: 3.5mm
• 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 small machine screws in steel
• Drilling aluminium and brass fittings
• Starting holes for larger fasteners
• Wood and plastic drilling on site

What You Need To Complete The Job

Run a 3.5mm bit fast with a steady feed and clear the flutes often on deeper holes. For concrete and brick, change to an SDS masonry drill, and keep a pair of leather rigger gloves handy when handling cut metal. The wider fastening range is in General Hand Tools.

Frequently Asked Questions

What is a 3.5mm drill bit used for?

A 3.5mm HSS bit is a useful in between size, often used as a pilot for 4mm and 4.2mm fasteners and for tapping fine threads in steel. It is a good general purpose size for sheet metal and light fabrication work.

How does the Viper point make drilling easier?

The split point bites in and self centers, so you get a clean start without the bit skating. Because it cuts at the centre, the bit needs less downward force, which makes hand held drilling more controlled and less tiring.

Do I need cutting fluid?

On mild steel a little cutting oil or even a spray lubricant helps the bit run cooler and keeps the edge longer. On aluminium, a light oil stops the bit loading up; on brass, keep the feed gentle to avoid digging in.

Will this bit work in a pillar drill?

Yes. The DIN338 jobber shank fits a standard 10mm or 13mm chuck, and the Viper point works well at the higher speeds a pillar drill can hold. Set a moderate speed and feed the bit smoothly.