Guhring 9055200055000 Cobalt Stub Drill Bit 0.2165 in

Product Description

The GUHRING 9055200055000 is a cobalt stub-length drill bit designed for precision drilling in production and machining environments. Built to DIN 1897 specifications, this bit measures 0.2165 inches (5.50 mm) in diameter with a 118-degree four-facet split point for fast penetration and reduced walking on entry. The two-flute spiral design with web thinning promotes efficient chip evacuation and reduces thrust. Overall length is 66.00 mm with a flute length of 28.00 mm. The straight-cylindrical shank seats securely in standard drill chucks and collet holders. Manufactured from cobalt high-speed steel, this bit holds hardness at elevated cutting temperatures better than standard HSS tooling.

This stub-length drill bit is suited for screw machine work, CNC drilling operations, and short-reach applications where rigidity matters more than depth capacity. The 3xD flute-to-diameter ratio and tapered web configuration make it a practical choice for drilling aluminum and other non-ferrous materials in high-cycle production settings. Maximum drilling depth reaches 0.778 inches (19.75 mm). Licensed machinists, tool-and-die technicians, and CNC machine operators are the typical end users. It ships as a single unit with a minimum order quantity of one.

Key Features

• Cobalt high-speed steel construction for heat resistance during high-speed cutting
• Four-facet split point at 118 degrees reduces thrust and improves centering
• Web-thinned tapered web lowers cutting resistance and aids chip flow
• Stub length (DIN 1897) provides added rigidity versus jobber-length bits
• Right-hand cut with regular spiral flutes for standard CNC and manual drilling
• Diameter tolerance of +0.000 to -0.018 mm for consistent hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit for use in standard drill chucks, collet holders, and screw machine spindles accepting a 5.50 mm straight-cylindrical shank. Primary workpiece material rating is aluminum; the cobalt construction also supports use in other non-ferrous and softer ferrous materials per application requirements.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or CNC operators familiar with proper toolholding practices. Ensure the spindle and workholding are fully stopped before seating or removing the bit. Verify chuck or collet runout is within acceptable limits to protect the close-diameter tolerance of this tool. Eye protection and appropriate chip guarding are required during all drilling operations per applicable shop safety standards.