Guhring 9005520073700 Stub Drill Bit 0.2902 in Hss Letter L

Product Description

The GUHRING 9005520073700 is a screw machine length (stub) drill bit designed for high-speed steel cutting applications where short tool overhang and rigid setups are required. Sized at 0.2902 inches in diameter and designated Letter L, this bit features a 130-degree split point, parabolic flute geometry, and a web-thinned tip for reduced thrust and cleaner entry. The bright, uncoated high speed steel construction makes it well suited for aluminum and other non-ferrous workpiece materials. Overall length is 2-29/32 inches, with a straight-cylindrical shank for direct chuck mounting on drill presses, lathes, CNC machines, and manual hand drills used in production and maintenance environments.

This stub-length drill bit is built to DIN 1897 standards and fits production machining, screw machine operations, and maintenance repair work requiring a compact, rigid drill. Its 3xD flute-to-diameter ratio and parabolic flute design promote efficient chip evacuation, which is especially beneficial when drilling aluminum. The straight shank diameter of 0.2902 inches seats directly in standard drill chucks without requiring a reduction sleeve or adapter. It is intended for use in shops, job sites, and production floors where tool consistency and dimensional accuracy are critical.

Key Features

• 130-degree drill point angle with web thinning for reduced entry thrust and accurate hole starts
• Parabolic flute geometry promotes fast chip evacuation, particularly in aluminum and soft metals
• Stub length (DIN 1897) provides increased rigidity and reduced deflection versus jobber-length bits
• Bright, uncoated high speed steel finish allows easy visual wear inspection and regrinding
• Straight-cylindrical shank seats in standard drill chucks without adapters
• Diameter tolerance of +0.000 to -0.022 mm supports consistent, repeatable hole sizing

Compatibility

Designed as an OEM-style screw machine length drill bit per DIN 1897, compatible with standard straight-shank drill chucks on drill presses, CNC machining centers, lathes, and hand drills accepting a 0.2902-inch shank. Rated for aluminum as the primary workpiece material and suitable for general non-ferrous and soft-material drilling within the 0.2500 to 0.3000 inch drill bit size range.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and locked out before mounting or removing the bit from the chuck. Use a proper chuck key or tooling wrench to seat the straight shank firmly and concentrically before operating. Always observe appropriate feeds and speeds for the workpiece material and machine type to prevent premature tool wear or breakage.