Hertel 08512238 No 40 Threaded Shank Drill Bit Hss

Product Description

The HERTEL 08512238 is a threaded shank drill bit engineered for precision drilling in low-tensile strength materials. Built from high speed steel with an oxide coating, this bit measures 0.0980 inches in diameter — equivalent to a No. 40 wire gauge size — and carries an overall length of 2.125 inches. The 135-degree split point geometry reduces walking on entry and lowers the thrust force needed to start a hole, making it well-suited for close-tolerance work. The 1/4-28 threaded hex shank provides positive retention in compatible quick-change chuck systems. Web thinning and a tapered web configuration improve chip evacuation and cutting efficiency.

This bit is intended for use in light-duty production drilling, maintenance, and assembly operations where a No. 40 wire gauge hole is required. It is classified as a general-purpose drill bit under NAS 965 specification, making it appropriate for aerospace-adjacent and industrial applications involving aluminum, plastics, soft metals, and other low-tensile strength materials. The 0.875-inch spiral flute length accommodates shallow to moderate depth holes. Right-hand cutting direction is standard for conventional drill press, hand drill, and pneumatic tool use.

Key Features

• No. 40 wire gauge diameter (0.0980 inches) for close-tolerance hole sizing
• 135-degree split point reduces drill walking and entry thrust force
• High speed steel construction with oxide finish for wear resistance
• 1/4-28 threaded hex shank for secure retention in quick-change chuck systems
• Web-thinned, tapered web design promotes chip clearance and reduces heat buildup
• Meets NAS 965 specification for general-purpose industrial and aerospace-adjacent use

Compatibility

Designed for use with quick-change or threaded 1/4-28 chuck systems accepting a hex shank threaded drill bit in No. 40 wire gauge size.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotary cutting tools. Ensure the drill or drill press is powered off and fully stopped before changing bits. Confirm the 1/4-28 threaded shank is fully engaged and secure in the chuck before operation. Always wear appropriate eye protection and follow applicable shop safety standards when operating drilling equipment.