Precision Twist Drill 5999239 Jobber Drill Bit 52 Hss

Product Description

The PRECISION TWIST DRILL 5999239 is a jobber-length drill bit sized at wire gauge 52 (0.0635 inches diameter), manufactured from high speed steel with a steam oxide coating for corrosion resistance and reduced friction during drilling. It features a standard 118-degree split-point tip, a regular spiral flute with two flutes, and a straight-cylindrical shank. Overall length is 1.875 inches with a flute length of 0.875 inches. The tapered web configuration and web-thinned geometry reduce thrust requirements when starting holes in tighter materials. This bit is used by machinists, maintenance technicians, and trade professionals requiring precise small-diameter drilling in metalworking applications.

This drill bit is suited for general-purpose drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The right-hand spiral flute clears chips efficiently in both through-hole and blind-hole applications. The steam oxide finish helps extend tool life in production environments where lubrication is applied. It is appropriate for benchtop drill presses, hand drills, and CNC drilling operations where small wire-gauge holes are required. Series R10-R15-R18 designation indicates compatibility with standard jobber-length toolholders and chucks sized for sub-1/8-inch shanks.

Key Features

• Wire gauge size 52 with 0.0635-inch diameter for precise small-bore drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction handles steel, cast iron, stainless steel, non-ferrous metals, and superalloys
• Steam oxide coating reduces friction and provides light corrosion protection
• Regular spiral flute with right-hand cut for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• ANSI-standard geometry for consistent, repeatable performance

Compatibility

Designed as a general-purpose jobber-length drill bit in Series R10-R15-R18, suitable for use in standard drill chucks and toolholders accommodating a 0.0635-inch straight-cylindrical shank. Compatible workpiece materials include steel, stainless steel, cast iron, non-ferrous metal, superalloys, and titanium per ISO material codes P, M, K, N, and S.

Installation Notes

Install and secure the shank fully in the drill chuck before operation, confirming there is no runout. Use appropriate cutting fluid or coolant when drilling steel, stainless steel, or hard alloys to maximize tool life, as this bit does not support coolant-through delivery. Inspect the cutting edges before use; discard bits showing chipping or excessive wear to avoid workpiece damage. Drilling speed selection should follow published surface-feet-per-minute recommendations for the specific workpiece material and this diameter.