Precision Twist Drill 5998756 Jobber Drill Bit 5/16 in Hss

Product Description

The PRECISION TWIST DRILL 5998756 is a jobber-length twist drill bit designed for general-purpose drilling in a wide range of materials. Ground from high-speed steel with a steam oxide finish, this bit features a 118-degree standard point angle and a right-hand spiral flute configuration. The 5/16-inch diameter matches a straight-cylindrical shank of equal diameter, making it compatible with standard three-jaw chucks. The tapered web with web-thinning reduces thrust force at the cutting point and helps maintain center accuracy. A licensed HVAC tech, plumber, electrician, or general trade professional will find this bit at home on metal fabrication, equipment mounting, and service work alike.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. The Series R10 jobber-length format provides a balance between reach and rigidity for common trade drilling tasks. With a flute-to-diameter ratio of 10xD and a maximum drilling depth of 3.1875 inches, it handles typical hole depths encountered in sheet metal, structural steel, and pipe work without excessive deflection. The single-piece construction and ANSI-standard geometry make it a straightforward drop-in for any job requiring a 5/16-inch hole.

Key Features

• High-speed steel construction with steam oxide finish for corrosion resistance and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and accurate starting
• Right-hand cut, regular spiral, two-flute design for efficient chip evacuation
• 5/16-inch straight-cylindrical shank fits standard drill chucks without adapters
• Overall length of 4.5 inches with a 3.1875-inch flute length for adequate reach
• ANSI-standard geometry; compatible with steel, stainless steel, cast iron, non-ferrous metals, and superalloys

Compatibility

Designed as a general-purpose jobber-length drill bit for use in any standard three-jaw chuck or drill press accepting a 5/16-inch straight shank. Suitable for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per ANSI Series R10 specifications.

Installation Notes

Install in a properly sized drill chuck and tighten securely before use. Power down and de-energize any equipment being drilled into before beginning work, in accordance with applicable lockout/tagout procedures. Use cutting fluid when drilling stainless steel, superalloys, or titanium to extend bit life and manage heat. Do not exceed the rated maximum drilling depth of 3.1875 inches in a single pass; retract frequently to clear chips and prevent binding.