Disston Company 571281 Cobalt Hss Drill Bit 3/8 in 135 Split Point

Product Description

The DISSTON COMPANY 571281 is a 3/8-inch cobalt high speed steel (HSS) jobber-length drill bit designed for demanding metal drilling applications. The 135-degree split point geometry features four cutting edges that allow fast penetration and prevent walking on contact, eliminating the need for a center punch on most surfaces. With 8 percent cobalt content blended into the steel, this bit maintains cutting efficiency at temperatures exceeding 1,000 degrees F, making it suitable for continuous use in tough materials. It is intended for use by machinists, pipefitters, ironworkers, and general-trade mechanics who drill hard metals regularly.

This bit is recommended for drilling heat-treated steel, stainless steel, chrome, manganese steel, titanium, and armor plate. At 3/8-inch diameter and jobber length, it fits standard 3/8-inch chuck drills and drill presses commonly found in field and shop environments. The jobber length provides a practical balance of reach and rigidity for through-hole and production drilling tasks in both residential and commercial trade applications.

Key Features

• 135-degree split point with 4 cutting edges for fast starts and reduced walking
• 8 percent cobalt HSS construction resists heat above 1,000 degrees F
• 3/8-inch diameter jobber length with 3/8-inch shank for standard chuck compatibility
• Rated for hard metals including stainless steel, titanium, manganese steel, and armor plate
• Single-piece carded packaging suitable for point-of-use storage

Compatibility

Designed as a jobber-length replacement or supplemental drill bit for use in any 3/8-inch or larger keyed or keyless drill chuck, corded or cordless, and standard drill press spindles accepting a 3/8-inch shank.

Installation Notes

A licensed mechanic, machinist, or qualified tradesperson should secure the bit fully in the chuck before operation. Use appropriate cutting fluid or coolant when drilling stainless steel or other work-hardening alloys to extend bit life and maintain dimensional accuracy. Always wear eye protection and secure the workpiece before drilling. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.