Hertel 74130113 Cobalt Screw Machine Drill Bit Size 1

Product Description

The HERTEL 74130113 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials. Built from cobalt high-speed steel, this bit handles heat-resistant alloys, stainless steel, and hard ferrous metals that standard HSS tooling struggles with. The 135-degree split point reduces thrust and starts on contact without a center punch. Overall length is 2-7/16 inches with a 1-5/16-inch flute length, making it compact and rigid for short-hole work in drill presses and CNC machines. The straight cylindrical shank fits standard drill chucks. A right-hand, regular spiral flute with web-thinned parallel web geometry improves chip evacuation and cutting efficiency.

This bit is sized to wire gauge No. 1, with a decimal inch diameter of 0.2280 inches, placing it in the 0.2000 to 0.2500 inch range. Screw machine length bits are the go-to choice in production environments where rigidity matters more than reach. Typical applications include metalworking shops, machine shops, aerospace MRO, and any operation requiring close-tolerance drilling in hard or abrasive stock. The bit is well-suited for use in drill presses, mill-drill machines, and CNC machining centers where short-reach tooling improves accuracy and reduces deflection.

Key Features

• Cobalt high-speed steel construction withstands elevated drilling temperatures in hard and abrasive metals
• 135-degree split point reduces thrust and eliminates the need for center-punching on flat stock
• Web-thinned parallel web geometry improves chip flow and reduces cutting resistance
• Screw machine length body provides superior rigidity over jobber-length bits in short-hole applications
• Straight cylindrical shank fits standard three-jaw drill chucks without adapters
• Right-hand, regular spiral flute with no coolant-through requirement keeps tooling cost low for general production use

Compatibility

Designed as an OEM-style replacement or direct-use cobalt screw machine drill bit for metalworking operations requiring a wire gauge No. 1 (0.2280 inch) diameter straight-shank drill in drill presses, mill-drills, and CNC machining centers.

Installation Notes

Installation is performed by machinists or toolroom technicians. Secure the straight shank firmly in a keyed or keyless drill chuck before operation and verify runout before committing to production work. Ensure the workpiece is clamped or fixtured — never hand-hold metal stock during drilling. Follow shop safety practices and applicable OSHA machining guidelines; use cutting fluid appropriate for the workpiece material to extend tool life when drilling stainless or high-alloy steel.