Hertel 74130592 Cobalt Screw Machine Drill Bit Size 8

Product Description

The HERTEL 74130592 is a cobalt screw machine length drill bit designed for high-speed drilling in hard and abrasive materials. Built to the HSCO135 series standard, it features a 135-degree split point that reduces walking on entry and lowers thrust force at the start of the cut. The web-thinned, parallel web configuration improves chip evacuation and cutting efficiency. At 0.1990 inch diameter with a 2.25-inch overall length, this stubby-format bit delivers rigidity and accuracy in tight-clearance drilling applications. It is suited for use in CNC machines, drill presses, and hand-held power tools by machinists, maintenance mechanics, and trade professionals working with ferrous metals, stainless steel, and hardened alloys.

Screw machine length drill bits are shorter than jobber-length bits, which increases stiffness and reduces deflection during high-feed drilling. This makes the 74130592 a practical choice for production drilling, tapping-prep holes, and close-tolerance work on metalworking equipment. The right-hand cutting direction and regular spiral flute geometry are standard for the majority of CNC and manual drilling setups. No coolant-through capability means this bit is intended for use with external coolant or cutting fluid application as needed by the application and material.

Key Features

• Cobalt construction provides heat and wear resistance when drilling hard metals and stainless steel
• 135-degree split point reduces drill walking and lowers required feed pressure at entry
• Web-thinned parallel web improves chip flow and reduces heat buildup at the cutting tip
• Screw machine length format increases rigidity and minimizes deflection versus jobber-length bits
• Straw finish indicates heat treatment; bright cutting edges deliver clean entry geometry
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for standard straight-shank drill chucks across CNC machining centers, drill presses, and portable power tools accepting bits in the 0.1500 to 0.2000 inch diameter range.

Installation Notes

Installation is performed by machinists and maintenance mechanics. Secure the straight shank firmly in a drill chuck and verify runout before cutting. Disengage and de-energize all machine power before changing bits. Apply cutting fluid externally when drilling ferrous metals or stainless steel to extend tool life and manage heat; do not run this bit dry in hard alloys for extended periods.