Precision Twist Drill 5995864 No. 39 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5995864 is a wire-gauge jobber-length drill bit sized No. 39 (0.0995 inches) with a 135-degree split point and a high-speed steel (HSS) construction finished with a bronze straw coating. The split point reduces walking on entry and lowers thrust requirements compared to a conventional 118-degree point. At 2.375 inches overall length and 1.375 inches of flute length, this is a standard jobber-proportion tool suited for bench drilling, drill presses, and hand-held power drills. Web thinning further improves chip clearance and cutting efficiency. Licensed HVAC technicians, machinists, and maintenance trades use this size when working with sheet metal, tubing, and precision assemblies.

This bit is rated for drilling high-temperature alloys and general-purpose metals. It fits typical applications where close-tolerance hole sizing in the No. 39 wire-gauge range is required, such as pilot holes, tap-drill operations for small-diameter threads, and clearance drilling in thin-gauge materials. The right-hand spiral flute geometry evacuates chips efficiently in metals and plastics. It conforms to ANSI standards and belongs to the HX10-HX15-HX18 series, which covers heavy-duty general-purpose jobber bits in the 0.0500 to 0.1000 inch diameter range.

Key Features

• No. 39 wire size, 0.0995 inches diameter — consistent with ANSI gauge standards
• 135-degree split point reduces bit walking and cutting thrust on entry
• High-speed steel construction with bronze straw coating for lubricity and heat resistance
• Web-thinned, tapered web for improved chip flow and reduced heat buildup
• Right-hand, regular spiral flute geometry suits a wide range of metal and plastic substrates
• Heavy-duty grade rated for high-temperature alloy workpieces (material codes P, M, K, S)

Compatibility

Designed as an ANSI-standard replacement or stocking bit for applications requiring No. 39 wire-gauge drilling in the HX10-HX15-HX18 series. Suitable for use in any standard straight-shank drill chuck accepting a 0.0995-inch shank diameter.

Installation Notes

Install in a standard keyless or keyed drill chuck rated for the shank diameter; ensure the chuck is fully tightened before operation. Secure the workpiece firmly before drilling to prevent rotation and maintain hole accuracy at this small diameter. Use cutting fluid or a light machine oil when drilling hard metals to extend bit life and reduce heat. Dispose of worn bits per shop waste procedures — do not attempt to re-sharpen without proper grinding equipment calibrated for split-point geometry.