Guhring 9055200079400 Cobalt Stub Drill Bit 5/16 in

Product Description

The GUHRING 9055200079400 is a cobalt stub-length (screw machine length) drill bit designed for high-productivity drilling in metalworking and maintenance applications. Built to DIN 1897 standards, this 5/16 inch (0.3125 inch) diameter bit features a 118-degree four-facet split point that reduces walking and thrust on entry. The web-thinned, tapered-web construction improves chip evacuation and extends tool life in demanding cuts. Two spiral flutes with a 3xD flute-to-diameter ratio keep swarf moving efficiently. The straight-cylindrical shank seats securely in standard drill chucks. This bit is specified for right-hand cutting and carries no coolant-through capability. Overall weight is 0.053 pounds.

This drill bit is suited for drilling aluminum and similar non-ferrous and ferrous materials in production, maintenance, and fabrication environments. The stub-length (screw machine length) body provides added rigidity over jobber-length bits, making it a practical choice for close-quarters work in machine spindles and drill presses. Maximum drilling depth reaches 0.988 inch (25.09 mm), appropriate for through-holes and blind holes in typical sheet and plate stock. Machinists, toolroom technicians, and maintenance trades working with manual or CNC drilling equipment will find this bit well suited to repeat-production cycles where precision entry and hole quality matter.

Key Features

• Cobalt tool material for elevated heat resistance and edge retention versus standard HSS
• 118-degree four-facet split point reduces thrust and self-centers on entry
• Web-thinned tapered web improves chip clearance and reduces cutting resistance
• Stub-length body adds rigidity and reduces deflection compared to jobber-length bits
• Straight-cylindrical shank fits standard drill chucks without adapters
• Manufactured to DIN 1897 specification for consistent dimensional accuracy

Compatibility

Designed as an OEM-specification stub-length drill bit conforming to DIN 1897, compatible with standard drill chucks accepting a 7.94 mm (approximately 5/16 inch) straight shank. Primary workpiece material rated for aluminum; also applicable to other non-ferrous and softer ferrous materials at appropriate speeds and feeds.

Installation Notes

Secure the shank fully in the drill chuck and verify runout before beginning a cut. Ensure the drilling machine spindle is stopped and locked out before changing or inspecting the bit. Apply appropriate cutting fluid for the workpiece material to maximize tool life and hole quality. Dispose of worn cobalt tooling according to local regulations for metal waste.