Precision Twist Drill 5998057 Jobber Drill Bit 58 Hss

Product Description

The PRECISION TWIST DRILL 5998057 is a jobber-length drill bit in wire gauge size 58, ground from high speed steel with a bright uncoated finish. It measures 0.0420 inches in decimal diameter and carries an overall length of 1.625 inches. The 118-degree split-point geometry and web-thinned tip reduce thrust force and improve centering on entry. A standard spiral flute with regular helix evacuates chips efficiently during through-hole and blind-hole drilling in a wide range of materials. This bit is sized and ground to ANSI standards and is installed by machinists, tool-and-die techs, maintenance mechanics, and precision fabricators.

This drill bit is suited for production and maintenance drilling in steel, cast iron, non-ferrous metals, superalloys, and titanium. The straight cylindrical shank seats in standard drill chucks and collets without modification. At 0.0420 inches diameter it is a common size for tapping pilot holes, small clearance holes, and precision layout work on light-gauge and heavy-gauge stock alike. It performs in handheld drill drivers, drill presses, CNC machining centers, and manual milling machines. The R10H-R18H series designation identifies it within PRECISION TWIST DRILL small-diameter jobber-length product family.

Key Features

• Wire gauge size 58, 0.0420 inches decimal diameter for precise small-hole work
• High speed steel construction handles steel, cast iron, non-ferrous metals, and superalloys
• 118-degree standard point angle with web-thinned tip reduces walking and entry thrust
• Bright uncoated finish suitable for general-purpose production and maintenance use
• Right-hand cut with regular spiral flute, 11/16 inch flute length for chip clearance
• Straight cylindrical shank, 0 flats, compatible with standard drill chucks and collets
• Conforms to ANSI specification for consistent ground geometry across the series

Compatibility

Part of the PRECISION TWIST DRILL R10H-R18H series. Fits standard drill chucks and collets accepting a 0.0420-inch straight cylindrical shank. Compatible with steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces as defined by material codes P, K, N, and S.

Installation Notes

This bit is installed by machinists, maintenance technicians, and precision fabricators using drill presses, CNC machines, or hand drills. Secure the shank fully in the chuck or collet before operation and verify concentricity to prevent deflection at this small diameter. Use appropriate cutting fluid or lubricant when drilling steel and superalloys to extend tool life. Inspect the cutting edges before each use; small-diameter HSS bits are susceptible to micro-fractures if subjected to side loading or excessive feed pressure.