Disston Company 571257 Cobalt Hss Drill Bit 7/32 Inch

Product Description

The DISSTON COMPANY 571257 is a high-speed steel drill bit with 8 percent cobalt content, ground to a 135-degree split point geometry with four cutting edges. Sized at 7/32 inch diameter and 3-3/4 inch overall length, it is a standard jobber-length bit with a straight shank. The cobalt alloy composition allows the bit to maintain cutting efficiency at temperatures exceeding 1,000 degrees Fahrenheit, making it suitable for materials that generate significant heat during drilling. The 135-degree split point initiates the cut without a center punch, reducing walking on smooth or hardened surfaces. This bit is suited for use by machinists, pipefitters, HVAC technicians, and general trade professionals who regularly drill through hard or abrasion-resistant metals.

The 571257 is recommended for drilling in hard metals including heat-treated steel, stainless steel, chrome, manganese steel, titanium, and armor plate. It is appropriate for field service and shop use where standard HSS bits lose their edge prematurely. The straight shank fits standard three-jaw drill chucks found on corded and cordless drills, drill presses, and magnetic-base drills commonly used in commercial and industrial trade applications.

Key Features

• 8 percent cobalt content for heat resistance above 1,000 degrees Fahrenheit
• 135-degree split point with four cutting edges for fast, self-starting penetration
• Eliminates walking on hardened or smooth metal surfaces without center punching
• Jobber-length design at 3-3/4 inches provides versatility across common drilling depths
• Straight shank fits standard drill chucks without adapters
• Rated for hard metals including stainless steel, titanium, and manganese steel

Compatibility

Designed for use in hard and exotic metals including heat-treated steel, stainless steel, chrome, manganese steel, titanium, and armor plate. Fits any standard drill chuck accepting a straight-shank jobber-length bit at 7/32 inch diameter.

Installation Notes

Secure the bit firmly in the chuck before use and verify the shank is fully seated. Use cutting fluid or coolant when drilling stainless steel or other work-hardening alloys to extend bit life and reduce heat buildup. Reduce feed pressure as the bit breaks through the far side of the material to prevent grab or breakage. This bit is intended for use by qualified trade professionals familiar with metal-drilling practices and appropriate personal protective equipment.