Precision Twist Drill 5996387 9/32 in Cobalt Taper Drill

Product Description

The PRECISION TWIST DRILL 5996387 is a taper length cobalt drill bit designed for heavy-duty metal drilling in demanding trade and industrial applications. Built from cobalt tool steel with a coated finish, this bit measures 9/32 inch (0.2812 inches) in diameter with an overall length of 6.25 inches and a flute length of 3.875 inches. The 135-degree split point geometry allows self-centering entry without a center punch, reducing walking on hard or smooth surfaces. Web thinning further reduces cutting resistance and thrust load. Right-hand spiral flutes evacuate chips efficiently during through-hole and deep drilling operations. Machinists, fabricators, and maintenance technicians working with ferrous and non-ferrous metals are the primary users of this bit.

This taper length drill bit is suited for production and maintenance drilling where a jobber-length bit lacks the reach needed. The longer flute-to-diameter ratio of 6xD provides extended reach into deeper workpieces without sacrificing rigidity. Compatible material applications include alloy steel, carbon steel, stainless steel, hardened steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, high strength bronze, copper, nickel, nickel alloy, magnesium, magnesium alloy, cermet, graphite, and reinforced plastic materials. This range of material compatibility makes it a practical all-around choice for shops, field fabrication, and maintenance applications where material types vary.

Key Features

• Cobalt tool steel construction rated for heavy-duty drilling in hard and abrasive materials
• 135-degree split point provides self-centering entry and reduces thrust load
• Web-thinned, tapered web configuration lowers cutting resistance in deep holes
• Taper length body with 6xD flute-to-diameter ratio for extended reach applications
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Straight shank fits standard drill chucks without adapters
• Conforms to ANSI standards for consistent dimensional accuracy

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit for standard straight-shank drill chucks in bench drill presses, hand drills, and CNC drilling operations requiring a 9/32 inch diameter cobalt bit.

Installation Notes

This bit is installed by a machinist or maintenance technician into any standard straight-shank chuck rated for 9/32 inch diameter tooling. Secure the shank fully in the chuck and verify runout before beginning a cut. When drilling hardened steel or stainless steel, use appropriate cutting fluid to extend tool life and manage heat. Coolant-through is not supported on this bit, so external lubrication is required for best results on difficult materials.