Value Collection -20917-5 21/64 in Hss Mechanics Drill Bit

Product Description

The VALUE COLLECTION -20917-5 is a mechanics-length high-speed steel drill bit designed for general-purpose metal drilling in trade and industrial applications. It measures 21/64 inches (0.3281 inches decimal) in diameter with an overall length of 4-1/16 inches and a flute length of 2-9/16 inches. The 135-degree split point geometry reduces walking on entry and requires no center punch on most surfaces. The oxide coating provides basic lubricity and surface protection. The Weldon flat shank with three flats resists bit slippage in compatible chuck holders. Right-hand spiral flutes evacuate chips efficiently during through-hole drilling.

This drill bit is suited for production drilling, maintenance work, and fabrication tasks where a shorter, more rigid mechanics-length bit is preferred over a jobber-length bit. It is intended for use in drill presses, mag drills, and hand drills equipped with Weldon-style or set-screw chuck holders. Primary workpiece materials include carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and steel. The parallel web configuration and web-thinned point reduce thrust requirements and improve cutting performance in harder ferrous materials.

Key Features

• 135-degree split point reduces drill walking and eliminates the need for a center punch on most workpieces
• Weldon flat shank with three flats prevents rotational slippage in set-screw chuck holders
• Mechanics length (4-1/16 inches OAL) provides increased rigidity compared to jobber-length bits
• High-speed steel construction handles carbon steel, cast iron, stainless steel, and high alloy steel
• Web-thinned, parallel web configuration lowers thrust force and extends bit life
• Oxide finish offers basic corrosion and heat resistance during dry drilling

Compatibility

Designed as a general-purpose mechanics-length drill bit compatible with Weldon-style set-screw chuck holders; suitable for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and steel workpieces.

Installation Notes

Install and remove this bit only with the drilling machine powered down and the chuck fully secured. Confirm the set-screw chuck is tightened against all three Weldon flats before operation to prevent bit pullout under load. Use appropriate cutting fluid when drilling stainless steel or high alloy steel to manage heat buildup. Follow applicable shop safety standards and wear rated eye protection during all drilling operations.