Jobber Drill Bits

Jobber Drill Bits

Jobber drill bits are the standard-length twist drill used across general engineering, fabrication, maintenance and construction. AIMS carries a broad range from Sutton Tools, Bordo and P&N in HSS and cobalt steel, covering metric, imperial and wire gauge sizes for virtually any drilling application.

Sutton Tools

Sutton Tools are Australia's best-known cutting tool manufacturer and the benchmark for quality in this range. The D101 Silver Bullet series uses standard bright HSS for general-purpose drilling in mild steel, aluminium and plastics. The D102 Blue Bullet adds a blue-oxide finish to the HSS for improved lubrication and corrosion resistance. Sutton also supplies left-hand jobber drills (D202 series) in cobalt steel — used when drilling out broken right-hand fasteners.

Cobalt Jobber Drills

Cobalt steel (M35 or M42) drills contain 5–8% cobalt, which improves hardness and heat resistance compared to standard HSS. They are the right choice for drilling stainless steel, high-tensile alloys, cast iron and harder grades of aluminium where standard HSS wears quickly or work-hardens the material.

Bordo and P&N

Bordo jobber drills offer a cost-effective option for workshop general-purpose use and are well regarded in the trade for value and reliability. P&N is another trusted Australian brand with a solid range of HSS jobber drills in standard sizes. Saber provides economy options for lower-demand applications.

Sizes and Standards

AIMS stocks jobber drills in metric (mm), imperial (fractional inch), wire gauge (No. 1–80) and letter gauge (A–Z) series. Metric sizes are most common for general engineering work. Wire gauge sizes are used in precision work, tapping size drilling and some toolmaking applications. Imperial fractional sizes remain important for maintenance on older equipment and American-specification machinery.

Buying Guide

For drilling mild steel, cast aluminium and general materials, HSS bright is the practical choice. Step up to cobalt for stainless, Hardox, inconel or any material that causes rapid HSS wear. For CNC work where hole position accuracy is critical, stub drill bits offer a stiffer, shorter alternative. For the hardest materials and highest production demands, see our solid carbide drill bits. Left-hand drills are a workshop essential for broken bolt extraction — they drill in the direction that can back the broken fastener out as the drill cuts.