Guhring 9055200030500 Cobalt Screw Machine Drill Bit

Product Description

The GUHRING 9055200030500 is a cobalt screw machine length (stub) drill bit designed for high-speed, precision drilling in metal fabrication and machining applications. Manufactured to DIN 1897 standards, it features a 0.12 inch (wire size 31) diameter with a straight-cylindrical shank measuring 3.05 mm. The 118-degree four-facet split point geometry reduces walking and enables clean entry without a center punch in most setups. Web-thinned and taper-webbed construction lowers thrust requirements and improves chip evacuation. This bit is suited for production drilling environments where stub-length rigidity and cobalt heat resistance are required. Licensed machinists, tool-and-die technicians, and precision machine operators are the primary installers.

This drill bit is built for screw machine and short-hole drilling applications in production runs. Its stub length provides added rigidity in turret lathes, screw machines, and drill presses where chatter and deflection must be minimized. The primary workpiece material rating is aluminum, though the cobalt construction extends usable life in other non-ferrous and softer ferrous materials as well. Maximum drilling depth is 0.529 inches (13.43 mm), making it appropriate for through-holes and blind holes in light-gauge stock and machined components. The 3xD flute-to-diameter ratio supports chip clearance in shallow-depth applications.

Key Features

• Cobalt tool material for elevated heat resistance and extended tool life in production drilling
• 118-degree four-facet split point reduces thrust and minimizes drill walking on entry
• Web-thinned, tapered-web construction lowers cutting resistance and improves chip flow
• Stub (screw machine) length provides superior rigidity over jobber-length bits in tight setups
• Right-hand spiral flute with regular helix for consistent chip evacuation in aluminum and similar materials
• Manufactured to DIN 1897 specification with a diameter tolerance of +0.000 to -0.018 mm

Compatibility

Designed as a DIN 1897 screw machine length replacement drill bit for use in standard straight-shank drill chucks, turret lathes, CNC drill presses, and screw machine tooling heads accepting a 3.05 mm shank diameter. No specific OEM model compatibility was provided in the product data.

Installation Notes

Installation is performed by machinists or qualified machine operators. Ensure the spindle is fully stopped and power is locked out before changing tooling in any drill press, lathe, or CNC machine. Secure the shank fully within the chuck to the recommended engagement depth and verify runout with a dial indicator before production use. Coolant-through is not supported on this bit; apply external cutting fluid appropriate for the workpiece material when drilling at high feed rates or in deep-hole applications.