Precision Twist Drill 5997727 Cobalt Jobber Drill No. 27

Product Description

The PRECISION TWIST DRILL 5997727 is a No. 27 wire gauge cobalt jobber-length drill bit designed for production and maintenance drilling in steel and other ferrous and non-ferrous materials. It measures 0.1440 inches in diameter with a 3.0-inch overall length and features a 135-degree split-point geometry that reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. The straw oxide finish provides a degree of lubricity and heat resistance during cutting. This bit is built to heavy-duty grade standards and suits applications where carbon steel twist drills wear too quickly.

This jobber drill is suited for general-purpose hole-making in steel, cast iron, aluminum, and similar materials in both shop and field environments. The 1.875-inch flute length allows drilling to a maximum depth of 1.875 inches in a single pass without retraction. It is a single-piece consumable used by machinists, maintenance technicians, pipefitters, and fabricators working on production lines, MRO tasks, or structural fabrication. The straight shank accepts standard three-jaw chucks on drill presses, hand drills, and CNC machines.

Key Features

• No. 27 wire gauge size — 0.1440-inch diameter for precise hole sizing
• Cobalt high-speed steel construction for extended tool life in hard and abrasive materials
• 135-degree web-thinned split point reduces thrust and minimizes drill walking on flat surfaces
• Straw oxide finish provides lubricity and mild heat resistance
• Regular spiral flute with tapered web configuration for efficient chip evacuation
• Meets ANSI and NAS 907 standards for jobber-length drill geometry

Compatibility

Designed as an OEM-style replacement or consumable drill bit for use in standard three-jaw drill chucks accepting a 0.1440-inch straight shank, compatible with the R10CO-R15CO-R18CO series from PRECISION TWIST DRILL.

Installation Notes

Installation is performed by machinists or maintenance technicians familiar with rotating cutting tools. Secure the straight shank fully in the chuck jaws and tighten with a chuck key before operating. Always power down and de-energize the drill press or machine tool before changing bits. Use appropriate cutting fluid or coolant for steel workpieces to extend bit life, noting that this bit does not support through-coolant delivery.