Precision Twist Drill 5996158 Cobalt Drill Bit 0.043 in

Product Description

The PRECISION TWIST DRILL 5996158 is a screw machine length cobalt drill bit designed for drilling into hard materials where standard high-speed steel falls short. It measures 0.043 inches in diameter, corresponding to wire gauge size 57, with an overall length of 1.375 inches and a flute length of 0.5 inches. The 135-degree split point reduces walking on entry and cuts aggressively through hardened steels, stainless, and other tough workpiece materials. The straight-cylindrical shank seats in standard drill chucks without modification. This bit is built to the M41CO series specification, conforming to ANSI standards, and is rated for heavy-duty, high-performance applications.

This drill bit is suited for machinists, maintenance technicians, and fabricators working in production or repair environments where screw machine length tooling is required. Screw machine length bits are shorter and stiffer than jobber-length equivalents, reducing deflection during close-tolerance or deep-hole work in metal fixtures, jigs, and component assemblies. The cobalt construction and web-thinned, tapered-web geometry make it a common choice when drilling hard alloys, tool steels, and abrasion-resistant metals in both manual and CNC setups. The regular spiral and 2.5xD flute-to-diameter ratio support efficient chip evacuation at appropriate feed and speed rates.

Key Features

• Cobalt tool material rated for high-performance drilling in hard and abrasion-resistant workpiece materials
• 135-degree standard point angle with web-thinned, tapered web for reduced entry force and improved self-centering
• Screw machine length body (1.375 inches overall) for increased rigidity and reduced deflection versus jobber-length bits
• Right-hand cut with regular spiral flute and 2.5xD flute-to-diameter ratio for efficient chip removal
• Straight-cylindrical shank for compatibility with standard drill chucks and collet holders
• Conforms to ANSI specification designation; M41 material grade; heavy-duty drill bit grade

Compatibility

Designed as a screw machine length replacement or production bit for use in any standard drill chuck or collet accepting a straight-cylindrical shank. No specific OEM equipment compatibility was stated in the product data.

Installation Notes

Installation and use of this drill bit is performed by machinists or qualified technicians using drill presses, lathes, or CNC machining centers. Ensure the workpiece is securely clamped and the chuck or collet is properly tightened before operation. Select appropriate spindle speed and feed rate for the workpiece material and bit diameter; running cobalt bits at incorrect speeds in hard materials accelerates premature wear. This bit does not support coolant-through operation and should be used with external cutting fluid when drilling hard alloys.