Precision Twist Drill 5996146 No. 54 Cobalt Screw Machine Bit

Product Description

The PRECISION TWIST DRILL 5996146 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to ANSI standards in the M41CO series, this bit carries a No. 54 wire gauge designation with a decimal diameter of 0.0550 inches. The 135-degree split point with web thinning reduces thrust and enables self-starting on flat and curved surfaces without center-punching. Overall length is 1-5/8 inches with a 5/8-inch flute length, making it suited for compact drilling applications in tight clearance environments. Licensed machinists, HVAC fabricators, and industrial maintenance technicians are the primary users.

This screw machine bit is intended for drilling hard metals and heavy-duty materials where standard high-speed steel bits wear prematurely. The stub-length geometry provides added rigidity and reduces deflection during short-hole drilling operations. Typical applications include production drilling in sheet metal, hardened steel components, stainless fastener clearance holes, and precision boring in fixtures or jigs. The right-hand spiral flute configuration handles standard rotary drilling in any industry-standard drill press, CNC machining center, or hand drill.

Key Features

• Cobalt construction (M41 material grade) resists heat and wear in hard material drilling
• 135-degree split point with web thinning reduces cutting thrust and eliminates walking
• Screw machine length geometry provides rigidity and minimizes deflection in short-hole applications
• Straight-cylindrical shank at 0.0550 inches fits standard drill chucks without adapters
• Regular spiral, tapered web configuration maintains chip clearance through the 5/8-inch flute
• Meets ANSI standards for dimensional accuracy and performance consistency

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for standard drill chucks and collets accepting a 0.0550-inch straight-cylindrical shank, compatible with drill presses, CNC machining centers, and hand drills used in production and maintenance applications.

Installation Notes

Installation is performed by machinists and maintenance technicians familiar with rotating cutting tools. Secure the straight-cylindrical shank fully in the chuck before operation and confirm runout is within acceptable limits before drilling. Always wear appropriate eye protection and follow shop safety procedures when operating drilling equipment. Do not exceed the recommended RPM range for the bit diameter and workpiece material combination.