Import 20917 Mechanics Drill Bit 21/64 in 135 Pt Hss

Product Description

The IMPORT 20917 is a mechanics-length twist drill bit designed for general-purpose drilling in metal, wood, and composite materials. Built from high-speed steel with an oxide finish, it measures 21/64 inch (0.3281 inch decimal) in diameter and features a 135-degree split point that self-centers on contact, reducing the need for a center punch. The Weldon flat shank with three flats provides a secure grip in compatible chucks, minimizing bit slippage under torque. At 4-1/16 inches overall length with a 2-9/16 inch flute, this bit is sized for close-quarters work in tight machine setups.

This bit is suited for use in drill presses, CNC machines, and handheld drills where a Weldon flat shank chuck is available. The mechanics-length body keeps the bit rigid in short-reach applications, making it a common choice for machining operations, metalworking shops, and general fabrication tasks. The spiral flute geometry and web-thinned parallel web promote chip evacuation and reduce cutting resistance. It ships individually but carries a minimum order quantity of 3 units.

Key Features

• 135-degree split point self-centers on material surface, reducing walking and eliminating the need for a pilot hole in most applications
• Weldon flat shank with 3 flats locks securely in Weldon-style chuck holders to prevent slippage
• High-speed steel construction with oxide coating provides heat resistance for general-purpose metal drilling
• Web-thinned parallel web reduces thrust required and extends cutting life
• Mechanics-length body (4-1/16 inches OAL) offers added rigidity in confined drilling setups
• Right-hand cut with regular spiral flutes for standard clockwise drilling operations

Compatibility

Designed for use in drill presses, milling machines, and CNC equipment fitted with Weldon flat shank tool holders. Suitable for general-purpose drilling in ferrous and non-ferrous metals, plastics, and wood composites.

Installation Notes

Secure the bit firmly in a Weldon-style collet or set-screw chuck before operation, ensuring all flats are properly engaged. Verify spindle speed is appropriate for the material being drilled and the bit diameter. Wear appropriate eye protection and secure the workpiece before drilling. Do not use this bit in a standard three-jaw keyless chuck not designed to accept Weldon flat shanks, as the bit may not seat correctly.