Precision Twist Drill 5996370 Letter O Hss Jobber Drill

Product Description

The PRECISION TWIST DRILL 5996370 is a letter O size jobber-length drill bit designed for general-purpose and heavy-duty drilling applications. Manufactured from M2 high speed steel with a bronze (straw) coating, it measures 0.316 inches in diameter and 4.5 inches overall. The 135-degree split point reduces walking on entry and lowers thrust requirements, while the web-thinned, tapered-web design improves chip evacuation. Two regular spiral flutes provide a 3.1875-inch depth of cut. This bit is appropriate for machinists, maintenance technicians, and fabricators working in production or field environments.

The 5996370 is engineered for drilling high-temperature alloys and general ferrous and non-ferrous materials, covering material grade designations P, M, K, and S. Its straight cylindrical shank accepts standard drill chucks without adapters. The 10xD flute-to-diameter ratio supports accurate hole geometry at jobber drilling depths. This bit suits drill presses, hand drills, and CNC drilling operations where a letter-size hole is required. It ships individually and is sold as a single unit.

Key Features

• M2 high speed steel construction rated for heavy-duty service
• Bronze straw coating reduces friction and extends tool life in high-temp alloys
• 135-degree web-thinned split point for fast entry and reduced walking
• Right-hand cut with two regular spiral flutes for efficient chip removal
• Straight cylindrical shank fits standard drill chucks with no adapter required
• ANSI-compliant dimensions, Series HX10-HX15-HX18

Compatibility

Designed as a general-purpose jobber drill bit for use in standard drill chucks on drill presses, hand drills, and CNC drilling equipment requiring a letter O size straight-shank bit. Compatible with Series HX10-HX15-HX18 as designated by the manufacturer.

Installation Notes

Installation of this drill bit is performed by machinists or maintenance technicians using a keyed or keyless drill chuck rated for the shank diameter. Secure the shank fully in the chuck before operation and verify the chuck key is removed before starting the machine. Use appropriate cutting fluid when drilling high-temperature alloys to manage heat buildup and protect the cutting edge. Follow applicable shop safety standards and machine guarding requirements during use.