Star-M Standard-length softwood auger bits, 25mm

Star-M 4S Series is a range of ten standard-length power drill auger bits for boring deep holes in softwood. Diameters run from 10mm to 29mm, with overall lengths of 250, 270, 290 or 330mm depending on size.

The lengths in this range match Star-M No.4 Power Drill Auger Bit table, so the spiral length, shank size and maximum speed shown for each size are taken from that table. The bit is made from high carbon steel, is used with an electric power drill and has a burr-free lead screw for quick, on-target starts and smooth cutting.

Where this product is used

• Boring deep through-holes in softwood
• Drilling with an electric power drill, keeping the speed below 3,000rpm up to 19mm and below 1,500rpm from 22mm

Features

• Burr-free lead screw for quick, on-target starts and smooth cutting
• Made from high carbon steel
• Hexagon shank on every size, in 7mm, 10mm or 12mm depending on diameter
• Maximum drill speed of 3,000rpm up to 19mm and 1,500rpm from 22mm

Key specifications

Choosing the right option

Choose by hole diameter first. The 10 and 11mm bits are 250mm long with a 7mm shank; 13 to 19mm bits have a 10mm shank; 22, 25 and 29mm bits are 330mm long and need the slower speed limit of 1,500rpm. If the timber is thin and you do not need the reach, the 6 Series short-length auger drill bits are shorter; for hardwood see the 8M Series medium-length hardwood auger drill bits or 8L Series long hardwood auger drill bits, and for holes deeper than 240mm see the 4L Series extended-length auger drill bits.

See also: 6 Series short-length auger drill bits, 8M Series medium-length hardwood auger drill bits, 8L Series long hardwood auger drill bits, 4L Series extended-length auger drill bits.