Cleveland C70170 Jobber Drill Bit Wire 37 Cobalt

Product Description

The CLEVELAND C70170 is a jobber-length twist drill bit designed for precision hole-making in metal and non-ferrous materials. Built from M42 cobalt high-speed steel with a gold oxide coating, the bit handles heat and wear better than standard HSS tooling. It carries a 135-degree split point that reduces walking and allows drilling without a center punch in most applications. At 2.5 inches overall length with a 1.4375-inch flute, it fits standard drill chucks and magnetic drill setups used in fabrication and maintenance work. This is a heavy-duty wire-gauge bit intended for professionals who need consistent, repeatable results in production or field drilling.

The C70170 is sized to wire gauge 37, which corresponds to a decimal diameter of 0.1040 inches. It is well suited for tapping pre-drill operations, clearance holes in aluminum, and pilot drilling in light steel. The NAS 907 Type J specification makes it a recognized standard in aerospace and industrial MRO work. The right-hand spiral flute with regular helix evacuates chips efficiently. Two flutes and a straight-cylindrical shank keep the bit compatible with standard keyless and keyed chucks across a wide range of drill platforms.

Key Features

• M42 cobalt HSS construction for extended tool life in abrasive and hard materials
• 135-degree split point reduces thrust and eliminates center-punch requirement on most metals
• Gold oxide coating provides lubricity and additional heat resistance
• Web-thinned, tapered web design reduces cutting resistance and improves chip flow
• Meets NAS 907 Type J specification for dimensional and performance consistency
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-specification replacement and general-use jobber drill bit for applications requiring a wire gauge 37 hole at 0.1040 inches diameter; compatible with any keyed or keyless drill chuck accepting a 0.1040-inch straight-cylindrical shank.

Installation Notes

Installation and use of this bit should be performed by machinists, maintenance technicians, or qualified tradespeople familiar with metalworking drill press or hand drill operation. Secure the straight-cylindrical shank fully in the chuck and verify it is centered before operation. Use appropriate cutting fluid or coolant when drilling steel to preserve edge life, even though coolant-through is not supported by this bit. Inspect the cutting edges before each use and replace immediately if chipping or dulling is observed to avoid workpiece damage or bit breakage.