Precision Twist Drill 5995860 No. 38 Hss Jobber Drill

Product Description

The PRECISION TWIST DRILL 5995860 is a No. 38 wire-size jobber-length drill bit designed for general-purpose drilling in steel, stainless steel, cast iron, superalloys, and titanium. The bit is ground from high speed steel and finished with a bronze coating to reduce friction and extend service life. A 135-degree split point starts on contact without a center punch and reduces thrust compared to a standard 118-degree point. Web thinning further lowers cutting resistance at the chisel edge. At 2.5 inches overall length with a 1.4375-inch flute length, this is a standard jobber proportion suited to hand-held drills, drill presses, and CNC lathes alike. Licensed machinists, tool-and-die techs, and maintenance mechanics are the typical users.

This bit belongs to the HX10-HX15-HX18 series and is rated for drilling into steel, stainless steel, cast iron, superalloys, and titanium — material codes P, M, K, and S in ISO classification. The straight-cylindrical shank at 0.1015 inches diameter seats in standard keyless or keyed chucks without adapters. Maximum drilling depth matches the flute length at 1.4375 inches. The 14xD flute-to-diameter ratio provides adequate chip clearance for these workpiece materials without requiring coolant-through capability.

Key Features

• No. 38 wire size, 0.1015 inches decimal diameter
• 135-degree split point with web thinning for self-starting entry and reduced thrust
• High speed steel construction with bronze coating for reduced friction
• Two spiral flutes, regular helix, tapered web configuration
• Rated for steel, stainless steel, cast iron, superalloys, and titanium
• Meets ANSI standards; no coolant-through required

Compatibility

Part of the HX10-HX15-HX18 series. Designed as a general-purpose jobber drill bit compatible with standard straight-shank chuck systems accepting a 0.1015-inch shank diameter.

Installation Notes

A licensed machinist or qualified maintenance mechanic should confirm chuck capacity before seating this bit, as the 0.1015-inch shank requires a chuck rated for small-diameter tooling. Secure the workpiece firmly before drilling to prevent walking at entry. Follow shop-specific speeds and feeds for the workpiece material being drilled. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.