Guhring 9055200034500 Cobalt Stub Drill Bit 0.136 in

Product Description

The GUHRING 9055200034500 is a cobalt stub-length (screw machine length) drill bit designed for high-speed, precision drilling in demanding shop and field environments. Built to DIN 1897 standards, this Series 5520 bit measures 0.136 inches (Wire Size 29) in diameter with a 118-degree four-facet split point for accurate starts without center-punching. The web-thinned, tapered-web geometry reduces thrust and improves chip evacuation. With an overall length of approximately 2.05 inches (52.00 mm) and a flute length of approximately 0.787 inches (20.00 mm), the short stub profile provides added rigidity in close-tolerance drilling applications. It weighs approximately 0.007 pounds.

This bit is suited for production drilling, screw machine setups, CNC machining centers, and bench-top drill press work where stub-length rigidity matters. The primary workpiece material rating is aluminum, though cobalt construction makes it capable across a wide range of non-ferrous and light ferrous materials. Right-hand spiral fluting clears chips efficiently during through-hole and shallow blind-hole operations. Maximum drilling depth is 0.584 inches (14.83 mm), consistent with the 3xD flute-to-diameter ratio. Machinists, tool-and-die workers, and maintenance technicians in manufacturing environments are the typical end users.

Key Features

• Cobalt tool material for improved heat and wear resistance over standard HSS
• Four-facet split point reduces walking and lowers required thrust force
• Web-thinned tapered web improves chip flow and reduces heat buildup at the cutting edge
• Stub-length body (52.00 mm overall) provides increased rigidity in tight setups
• Straight-cylindrical shank fits standard drill chucks and collets without modification
• Manufactured to DIN 1897 specification for dimensional consistency

Compatibility

Designed as an OEM-style replacement or production drill bit for use in standard drill chucks, collet systems, and screw machine spindles accepting a 0.1360-inch straight-cylindrical shank diameter (3.45 mm shank).

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or maintenance technician familiar with cutting tool selection and machine operation. Secure the shank fully in a properly sized chuck or collet before operation and verify runout is within acceptable limits. Always set spindle speed appropriate to the workpiece material and bit diameter per standard machining guidelines. Wear appropriate eye protection and ensure the workpiece is clamped securely before drilling.