Guhring 9055200103200 Cobalt Stub Drill Bit 0.4062 in

Product Description

The GUHRING 9055200103200 is a cobalt screw machine (stub) length drill bit designed for high-speed metal drilling in demanding shop and field applications. Built to DIN 1897 standards, this bit features a 118-degree four facet split point with web thinning for fast, accurate penetration and reduced thrust. The straight-cylindrical shank measures 10.32 mm in diameter and fits standard drill chucks. With a regular spiral flute and tapered web configuration, the bit clears chips efficiently while maintaining rigidity over its 89 mm overall length. It is sold individually and suited for machinists, maintenance technicians, and trade professionals who require precision in tight drilling conditions.

This stub length drill bit is sized at 13/32 inch (0.4062 inch decimal) and is optimized for drilling aluminum as its primary workpiece material, though the cobalt construction also performs well in other non-ferrous and ferrous applications. The shorter flute length of 43 mm provides added stiffness compared to jobber-length bits, making it a practical choice for screw machine work, CNC setups, and production drilling where rigidity and hole location accuracy are priorities. Maximum drilling depth is 1.083 inches (27.52 mm).

Key Features

• Cobalt tool material with coated finish for extended wear resistance
• 118-degree four facet split point with web thinning reduces walking and entry thrust
• Stub (screw machine) length body increases rigidity over standard jobber bits
• Regular spiral flute with tapered web for efficient chip evacuation
• Right-hand cut, straight-cylindrical shank for standard chuck compatibility
• Conforms to DIN 1897 specification
• Drill bit diameter tolerance: plus 0.000 to minus 0.027 mm

Compatibility

Designed as a DIN 1897 stub length replacement drill bit in the 0.4000 to 0.4500 inch diameter range, compatible with standard straight-shank drill chucks used in screw machines, CNC drilling centers, and hand-held drill presses.

Installation Notes

This bit should be installed and operated by qualified machinists or trade technicians familiar with cutting tool safety. Secure the shank fully in the chuck and verify runout before drilling. Do not exceed the recommended drilling depth of 1.083 inches without retracting to clear chips. Coolant-through is not supported on this bit, so apply cutting fluid externally when drilling harder materials.