Guhring 9055100098000 Screw Machine Drill Bit 0.3858 in

Product Description

The GUHRING 9055100098000 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding industrial and machining applications. Built to DIN 6537 K standards, this bit features a 140-degree split point (SU point type) with web thinning for improved centering and reduced thrust. The 0.3858-inch (letter size W) diameter and straight-cylindrical shank ensure secure chuck retention. At 89.00 mm overall length with a 47.00 mm flute length, it fits standard screw machine setups. Coolant-through capability supports high-speed, continuous drilling in ferrous materials. Intended for installation and use by machinists and tool-and-die professionals.

This drill bit is suited for production drilling in cast iron and steel workpieces in both CNC machining centers and manual screw machine operations. The screw machine length (stub) profile keeps the bit rigid and reduces deflection in high-feed applications. The 3xD flute-to-diameter ratio and regular spiral flute geometry handle chip evacuation effectively in both through-hole and blind-hole drilling scenarios. The coated finish extends tool life in high-cycle production environments.

Key Features

• Solid carbide submicron-grade construction for rigidity and wear resistance
• 140-degree SU split point with web thinning for self-centering and low thrust
• Coolant-through design supports high-speed drilling without external flood coolant alone
• Straight-cylindrical shank with 10.00 mm shank diameter fits standard toolholders
• DIN 6537 K specification with diameter tolerance of plus 0.006 to plus 0.021 mm
• Right-hand cut, regular spiral flute with 2-flute configuration

Compatibility

Designed for use in CNC machining centers and screw machine setups targeting cast iron and steel workpieces. Compatible with toolholders accepting a 10.00 mm straight-cylindrical shank. Part of GUHRING Series 5510, drill bit size range 0.3500 to 0.4000 decimal inch.

Installation Notes

Installation should be performed by a qualified machinist familiar with carbide tooling. Ensure the machine spindle and toolholder are clean and free of runout before seating the shank. Solid carbide is brittle compared to HSS — avoid side loads, interrupted cuts without proper feed management, or dropping the tool on hard surfaces. Verify coolant-through passages are clear and coolant pressure is appropriate for the machine setup before beginning a drilling cycle.