Guhring 9005520040400 Screw Machine Drill Bit Hss

Product Description

The GUHRING 9005520040400 is a screw machine length (stub) drill bit designed for fast, accurate drilling in production and job-shop environments. Built from high-speed steel with a bright/uncoated finish, it measures 0.159 inches in diameter (Wire Size 21) and has an overall length of 2-5/32 inches. The 130-degree point angle and parabolic flute geometry promote efficient chip evacuation and reduce cutting forces, making this bit well suited for aluminum and other non-ferrous materials. Right-hand cutting direction, a straight-cylindrical shank, and a web-thinned, parallel web configuration round out the design. Machinists, tool-and-die technicians, and production drilling operators are the primary users of this bit.

This drill bit is classified as a stub-length (screw machine length) tool, which provides greater rigidity than jobber-length bits and is a common choice for drill press, CNC, and manual machine tool applications where hole depth requirements are modest. It is rated for aluminum as the primary workpiece material but is suitable for other soft metals and plastics in comparable applications. The maximum drilling depth is 0.628 inches. The flute length is 7/8 inch, and the flute-to-diameter ratio is 3xD. This bit conforms to DIN 1897 standards, making it interchangeable with other tooling specified to that standard.

Key Features

• 0.159 inch (Wire Size 21) diameter with a tolerance of +0.000 to -0.018 mm for precise hole sizing
• 130-degree split point angle reduces walking and lowers thrust requirements at entry
• Parabolic flute profile improves chip flow and lowers heat buildup during drilling
• Web-thinned, parallel web construction reduces cutting resistance and extends tool life
• Bright/uncoated high-speed steel construction is compatible with standard cutting fluids and regrinding
• Conforms to DIN 1897 stub-length specification for dimensional consistency

Compatibility

Designed as a DIN 1897 stub-length drill bit for use in standard straight-shank drill chucks on drill presses, CNC machining centers, and manual machine tools where a Wire Size 21 (0.159 inch) bore is required.

Installation Notes

This bit is installed and removed by a licensed machinist or qualified tool operator following standard machine tool lockout/tagout procedures before changing tooling. Secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet to prevent slippage. Although this bit is rated for use without coolant-through capability, applying a compatible cutting fluid at the point is recommended to extend tool life when drilling metals. Do not exceed the maximum drilling depth of 0.628 inches per pass without retracting to clear chips.