Hertel 74132283 Drill Bit Size 31 Cobalt Tialn

Product Description

The HERTEL 74132283 is a screw machine length drill bit designed for high-production drilling in metal and hard materials. Built from cobalt steel with a titanium aluminum nitride (TiAlN) coating, it handles heat and abrasion better than standard high-speed steel bits. The split point at 135 degrees reduces walking and allows drilling without a center punch on flat or curved surfaces. At 1-7/8 inches overall length, this stub-length geometry improves rigidity and reduces deflection in short-reach applications. Machinists, tool-and-die workers, and maintenance technicians use this bit where accuracy and tool life in tough materials are the priority.

This bit is sized at wire gauge Number 31, equal to 0.1200 inch decimal diameter. Screw machine length bits are commonly used in CNC machining centers, drill presses, and hand-held power tools where a shorter, stiffer bit is preferred over jobber length. The straight-cylindrical shank seats directly in standard drill chucks without adapters. The web-thinned, parallel-web construction reduces thrust force at the cutting tip, which is especially useful when drilling stainless steel, alloy steel, cast iron, and similarly abrasion-resistant workpiece materials.

Key Features

• Cobalt steel construction for elevated heat resistance in hard and abrasive materials
• TiAlN coating extends tool life by reducing friction and oxidation at the cutting edge
• 135-degree split point reduces drill walking and lowers required entry force
• Stub screw machine length (1-7/8 inches OAL) maximizes rigidity and minimizes deflection
• Web-thinned parallel web reduces axial thrust during drilling
• Right-hand spiral flute clears chips efficiently in standard drill rotation

Compatibility

Designed as an OEM-style replacement or direct substitute for wire gauge Number 31 screw machine length drill bits used in standard drill chucks accepting straight-cylindrical shanks.

Installation Notes

Installation and use should be performed by machinists or qualified trade technicians familiar with drill press and CNC spindle setups. Secure the workpiece firmly before drilling and confirm the chuck is properly tightened on the straight-cylindrical shank before starting the spindle. Avoid side-loading or prying with the bit, which can snap the small-diameter shank. Disconnect power to the machine and allow the spindle to come to a full stop before changing bits or inspecting the cutting edge.