Guhring 9055240011800 Cobalt Stub Drill Bit Size 56

Product Description

The GUHRING 9055240011800 is a cobalt stub-length (screw machine length) twist drill bit in wire gauge size 56, equivalent to 0.0465 inches in diameter. Built to DIN 1897 specification from M35 cobalt high-speed steel, it features a 118-degree four-facet split point and a web-thinned, tapered web configuration that reduces entry thrust and improves chip evacuation. The bright, uncoated finish suits applications where coating adhesion to base metal is the priority. With an overall length of 28 millimeters (1.1024 inches) and a flute length of 7 millimeters, this bit is designed for controlled, close-tolerance drilling in small-diameter work.

This drill bit is suited for production machining, maintenance, and fabrication environments where small wire-gauge holes are required in aluminum and similarly machinable materials. The stub-length body provides added rigidity compared to jobber-length bits, making it a practical choice for drill press work, CNC operations, and hand-drill applications where deflection control matters. The straight-cylindrical shank fits standard collets and chucks sized for 1.18 millimeter (0.0465 inch) shanks. Maximum drilling depth is 5.23 millimeters (0.206 inches) per the 3xD flute-by-diameter ratio.

Key Features

• M35 cobalt steel construction for improved heat and wear resistance over standard HSS
• 118-degree four-facet split point with web thinning reduces thrust and centers on entry
• DIN 1897 stub-length body adds rigidity and reduces deflection in small-diameter drilling
• Bright, uncoated finish — no coating interference on aluminum or soft alloys
• Regular spiral, two-flute design promotes efficient chip clearing in through-hole operations
• Diameter tolerance of +0.000 to -0.014 mm for consistent, repeatable hole sizing

Compatibility

Designed as a DIN 1897 stub-length replacement for wire gauge size 56 (0.0465 inch) cobalt drill bits used in standard straight-shank chucks and collet systems. Primary workpiece material per manufacturer specification is aluminum.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable tolerance for the application. Disconnect power to the machine before changing tooling. Do not exceed the rated maximum drilling depth of 5.23 millimeters without retracting to clear chips.