Precision Twist Drill 5995788 Wire 21 Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5995788 is a jobber-length drill bit in wire gauge size 21, measuring 0.1590 inches in diameter. Built from M2 high speed steel with a bronze (purple/bronze) coating, it is engineered for general-purpose drilling in steel, stainless steel, cast iron, superalloys, and titanium. The 135-degree split-point tip reduces walking on entry and minimizes the need for a center punch. With a 3.25-inch overall length and 2.125-inch spiral flute, this bit is suited for production drilling in machine shops, maintenance environments, and fabrication settings. Licensed trades and industrial drill press operators are the primary installers.

This drill bit is designed for right-hand cutting with a straight cylindrical shank, making it compatible with standard three-jaw drill chucks and collet-style tooling. It fits applications requiring precision hole placement in ferrous and exotic workpiece materials. The tapered web and web-thinned geometry reduce thrust load during drilling, which is especially useful when working through harder alloys. It fits within the HX10, HX15, and HX18 series product lines and is suited for through-hole and blind-hole work up to a maximum drilling depth of 2.125 inches.

Key Features

• Wire gauge size 21 (0.1590 inches) with matching straight cylindrical shank diameter
• M2 high speed steel construction for heat and wear resistance in hard materials
• 135-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Bronze coating provides lubricity and surface hardness for extended tool life
• 2-flute regular spiral geometry with 13xD flute-to-diameter ratio
• Meets ANSI standards for jobber-length drill bit geometry

Compatibility

Designed for use in steel, stainless steel, cast iron, superalloys, and titanium workpieces. Compatible with any standard drill chuck or collet accepting a 0.1590-inch straight cylindrical shank. Part of the PRECISION TWIST DRILL HX10, HX15, and HX18 series.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and metalworking professionals using drill presses, CNC machining centers, or handheld power drills. Secure the shank firmly in the chuck before operation and verify chuck runout is within acceptable limits to prevent premature wear. Always use appropriate cutting fluid or coolant when drilling stainless steel, cast iron, or titanium to manage heat buildup. Do not exceed the recommended maximum drilling depth of 2.125 inches for this bit length.