Precision Twist Drill 5997093 Jobber Drill Bit 1/4 in

Product Description

The PRECISION TWIST DRILL 5997093 is a jobber-length twist drill bit designed for general-purpose drilling in metal and hard materials. Built from high-speed steel with a bright uncoated finish, it features a 135-degree split point for reduced walking and faster penetration without a center punch. The parabolic spiral flute geometry promotes efficient chip evacuation, which reduces heat buildup during prolonged drilling cycles. The straight cylindrical shank measures 1/4 inch in diameter and seats securely in standard 3-jaw chucks. At 4 inches overall length with a 2.75-inch flute, this bit suits bench drills, handheld drills, and drill presses used in production and service environments.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It carries an 11xD flute-to-diameter ratio, making it appropriate for moderate-depth through-hole and blind-hole applications. Machinists, maintenance technicians, pipefitters, and HVAC sheet metal fabricators will find it useful for field and shop drilling tasks where a standard jobber-length geometry is required. It conforms to ANSI standards and belongs to the QC21P series, which is rated as a heavy-duty general-purpose classification.

Key Features

• 135-degree split point reduces bit walking and lowers entry thrust on hard stock
• High-speed steel construction handles steel, stainless, cast iron, non-ferrous metals, superalloys, and titanium
• Parabolic spiral flute improves chip clearance and reduces heat accumulation
• Web-thinned tapered web improves cutting efficiency and reduces axial load
• Straight cylindrical 1/4-inch shank fits standard drill chucks without adapters
• ANSI-compliant QC21P series, heavy-duty grade rating

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any 3-jaw or keyed drill chuck accepting a 1/4-inch straight cylindrical shank, including handheld drills, drill presses, and milling machine setups.

Installation Notes

Secure the shank fully in the chuck and verify it is centered before operation. Always power down and de-energize the drill press or disconnect the handheld tool before changing bits. Wear eye protection and secure the workpiece with a clamp or vise — do not hold sheet stock by hand when drilling. Cutting fluid is recommended when drilling stainless steel, superalloys, or titanium to extend bit life and reduce thermal damage.