Precision Twist Drill 5996058 Screw Machine Drill Bit No. 17

Product Description

The PRECISION TWIST DRILL 5996058 is a cobalt screw machine length drill bit sized at No. 17 (0.1730 inches) with a 135-degree split point and web-thinned geometry. Designed for high-performance drilling in hard and tough materials, this bit belongs to the M41CO series, which uses M41 high-speed cobalt steel to resist heat buildup and maintain edge retention under demanding conditions. The shortened overall length of 2-3/16 inches makes it well suited for confined work envelopes and rigid setups on drill presses or CNC screw machines. Right-hand spiral flutes with a 2.5xD flute-to-diameter ratio clear chips efficiently during production runs.

This screw machine length bit is used in metalworking, machining, and fabrication environments where standard-length bits are too long for the setup or where rigidity is critical to hole accuracy. The 135-degree split point reduces walking on entry without a center punch and lowers thrust requirements, making it a preferred choice for production drilling in hard metals, stainless, and alloy steels. It is typically installed in manual drill presses, CNC machining centers, screw machines, and turret lathes by machinists and tool-and-die professionals.

Key Features

• M41 cobalt high-speed steel construction for heat and wear resistance in hard materials
• 135-degree split point with web thinning reduces entry thrust and eliminates walking
• Screw machine length (2-3/16 inches OAL) provides added rigidity in tight setups
• Straight-cylindrical shank at 0.1730 inches diameter fits standard drill chucks without adapters
• Regular spiral flutes with 2.5xD ratio promote efficient chip evacuation
• Meets ANSI standards; rated for heavy-duty, high-performance drilling applications

Compatibility

Designed as a direct-fit replacement or production drill bit for use in standard drill chucks, collets, and screw machine spindles accepting a 0.1730-inch straight-cylindrical shank. Suitable for drilling hard metals, alloy steels, stainless steel, and similar materials per the M41CO series application range.

Installation Notes

Installation is performed by machinists and toolroom personnel. Secure the straight shank fully in the chuck or collet before running the spindle, and verify runout is within acceptable limits for the hole tolerance required. Always power down and de-energize the machine before changing tooling. Cutting fluid or coolant is recommended when drilling hard or stainless alloys to extend tool life, even though this bit does not have through-coolant capability.