Hertel 74130873 Cobalt Screw Machine Drill Bit Size 35

Product Description

The HERTEL 74130873 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including stainless steel, hardened alloys, and heat-resistant metals. Built to wire gauge Size 35 (0.1100 inch decimal equivalent, 7/64 inch fractional), it features a 135-degree split point for self-centering entry without a center punch. The web-thinned geometry reduces thrust and improves chip evacuation. At 1-7/8 inches overall length with a 7/8-inch flute, this stub-length format delivers added rigidity in confined drilling applications. Right-hand cutting direction and a straight cylindrical shank allow use in standard drill chucks and CNC toolholders. The straw finish indicates a heat-treated cobalt steel construction suited for demanding production and maintenance drilling work.

This bit is used in production machining, tool-and-die, metal fabrication, and general maintenance applications where a short, rigid drill is preferred over jobber-length formats. The screw machine length is especially practical when drilling on mills, drill presses, or lathes where clearance is limited and runout control is critical. It handles ferrous and non-ferrous metals, plastics, and composite materials. Machinists, maintenance technicians, and metal fabricators working in manufacturing or MRO environments are the primary users of this bit style.

Key Features

• Cobalt construction provides heat resistance for drilling hardened and stainless steel
• 135-degree split point enables self-centering starts without a center punch
• Web-thinned, parallel web geometry reduces drilling thrust and improves chip flow
• Screw machine (stub) length adds rigidity and minimizes deflection
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks and collet holders

Compatibility

Designed as a screw machine length replacement drill bit in Size 35 wire gauge, compatible with standard straight-shank drill chucks, collet chucks, and CNC toolholders accepting a 7/64 inch or 0.1100 inch diameter shank.

Installation Notes

Installation and operation should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank firmly in a properly sized drill chuck or collet to minimize runout before operation. Always wear appropriate eye protection and follow machine guarding requirements per applicable workplace safety standards. Inspect the cutting edges for chipping or wear before each use and replace if cutting geometry is compromised.