Precision Twist Drill 5997755 No. 34 Cobalt Jobber Drill

Product Description

The PRECISION TWIST DRILL 5997755 is a wire-gauge jobber-length drill bit in No. 34 size (0.1110 inch diameter), designed for general-purpose drilling in steel and other metals. Built from cobalt high speed steel with an oxide and straw finish, it delivers improved heat resistance and extended tool life compared to standard HSS bits. The 135-degree split point geometry reduces walking on entry and lowers thrust requirements, making it well suited for production drilling and repetitive hole-making operations. The web-thinned, tapered-web construction keeps cutting forces low. Overall length is 2.625 inches, flute length is 1.5 inches, and the straight cylindrical shank measures 0.1110 inch in diameter.

This bit is intended for drilling steel, cast iron, non-ferrous metals, and similar workpiece materials classified under material codes P, M, K, N, and S. It fits standard drill chucks and collet systems that accept straight-shank tooling. Typical applications include maintenance and repair work, light fabrication, and production drilling where a small-diameter cobalt bit is required. The 14xD flute-to-diameter ratio provides adequate chip clearance for the hole depths typical in jobber-length applications. It meets ANSI standards and carries NAS 907 specification designation, making it appropriate for aerospace-adjacent and precision metalworking environments.

Key Features

• Cobalt high speed steel construction for improved heat and wear resistance in steel drilling
• 135-degree split point reduces walking on entry and lowers feed force requirements
• Oxide and straw coating provides corrosion resistance and mild lubricity
• Web-thinned, tapered web design reduces cutting resistance at the chisel edge
• Right-hand regular spiral flute with 14xD ratio for efficient chip evacuation
• Meets ANSI standards and NAS 907 specification for consistent dimensional accuracy

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks and collet holders accepting 0.1110-inch straight-cylindrical shanks. Part of the R10CO-R15CO-R18CO series from PRECISION TWIST DRILL.

Installation Notes

Machinists and maintenance technicians should secure the shank fully in the chuck or collet before operation and verify concentricity to minimize runout. Power down and de-energize the machine before changing bits. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting this bit does not support coolant-through delivery. Dispose of worn tooling per shop policy and inspect the cutting edges before each use.