Value Collection -20870-Z Letter Z Mechanics Drill Bit Hss

Product Description

The VALUE COLLECTION -20870-Z is a Letter Z mechanics drill bit designed for drilling through ferrous metals and alloy steels in production and maintenance applications. The bit measures 0.4130 inches (Letter Z) in diameter with a 135-degree split point that reduces walking on contact and lowers the thrust needed to start a hole. The high-speed steel construction handles the heat generated in moderate-speed drilling operations. A three-flat Weldon shank provides positive drive engagement in compatible chuck holders, preventing slippage under torque. The oxide finish offers light corrosion resistance during storage and use.

This mechanics-length bit is suited for general-purpose drilling in job shop, fabrication, and maintenance-repair environments. The shorter overall length compared to jobber-length bits provides added rigidity when drilling in tight spaces or when using drill presses and milling machines. The right-hand spiral flutes evacuate chips efficiently from the cutting zone. The web-thinned, parallel-web configuration reduces cutting resistance, making this bit effective on carbon steel, cast iron, high alloy steel, high tensile strength alloys, and stainless steel workpieces.

Key Features

• Letter Z diameter — 0.4130 inches for precise hole sizing without conversion
• 135-degree split point reduces drill walking and lowers feed pressure required
• High-speed steel construction withstands heat generated in ferrous metal drilling
• Three-flat Weldon shank prevents rotation in compatible holders under load
• Web-thinned parallel web reduces cutting resistance on tough alloys and stainless steel
• Oxide finish provides light surface protection during storage and handling

Compatibility

Designed for use in drill presses, milling machines, and hand drills fitted with Weldon flat-shank compatible chuck holders. Suitable for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloys, and stainless steel workpieces in general-purpose applications.

Installation Notes

Installed by machinists, toolmakers, and maintenance mechanics. Secure the Weldon shank firmly in a matched holder to fully engage the drive flats before operation. Ensure the workpiece is clamped securely before drilling to prevent movement. Use appropriate cutting fluid or coolant for stainless steel and high alloy steel to extend tool life and maintain cut quality.