Hertel 74131137 Screw Machine Drill Bit Letter a

Product Description

The HERTEL 74131137 is a screw machine length cobalt drill bit designed for high-speed drilling in tough materials including stainless steel, hardened alloys, and heat-resistant metals. Built to the HSCO135 series specification, it features a 135-degree split point that reduces walking on entry and minimizes the need for a center punch. The web-thinned, parallel web configuration reduces thrust and improves chip evacuation. At 2-7/16 inches overall length, this short-length format provides added rigidity in CNC machine tools, drill presses, and production setups where deflection must be minimized.

This bit is suited for production machining environments, toolroom work, and maintenance operations involving difficult-to-machine materials. The straight cylindrical shank fits standard drill chucks and collet holders without adapters. With a 1-5/16 inch flute length and a drill diameter of 0.2340 inches, it covers the Letter A size range used in tapping and close-tolerance hole work. Machinists, tool-and-die technicians, and industrial maintenance professionals are the primary users of this type of tooling.

Key Features

• 135-degree split point reduces entry walking and lowers thrust requirements
• Web-thinned parallel web improves chip clearance and reduces heat buildup
• Cobalt construction with straw finish provides heat and wear resistance in hard materials
• Screw machine length body adds rigidity and reduces deflection versus jobber-length bits
• Right-hand cutting, regular spiral flute for standard clockwise spindle operation
• Straight cylindrical shank for universal chuck and collet compatibility

Compatibility

Designed as a direct-fit screw machine length drill bit for standard drill chucks and collet holders accepting a straight cylindrical shank in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill chuck or collet tooling. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Secure the shank fully within the chuck or collet to the recommended engagement depth to prevent slippage under load. Do not exceed the recommended feed and speed parameters for cobalt tooling in the material being drilled.