Expertly engineered for high-efficiency coarse pitch threading in structural materials, the Guhring UNC Yellow Ring Bright Finish Spiral Point Gun Tap range is the definitive industrial choice for machine tapping through-holes. Operating on the standard 60° Unified coarse thread profile, these premium high-speed steel (HSS-E) tools are manufactured to strict DIN 371 dimensions, featuring a reinforced shank that delivers maximum torsional rigidity and completely eliminates tool deflection in smaller nominal diameters. The advanced spiral point (gun nose) geometry continuously drives compact chips forward ahead of the tool cutting action, eliminating chip nesting and ensuring reliable, high-speed production. Featuring a premium un-coated bright finish, these tools offer an ultra-sharp cutting edge that minimizes friction and prevents work hardening. Guhring's signature Yellow Ring classification tells CNC programmers and machinists that these reinforced-shank taps are specifically optimized to deliver exceptional tool life and perfect pitch compliance when threading structural steels, mild steel, AS/NZS 3678 250 and 350 grade plate, free-cutting steels, and unalloyed case-hardened steels.

HSS APPLICATIONS

• Primary for machine tapping
• Ideal for through holes as the tap pushes the swarf forwards
• Great for cutting new threads
• Suited for use in a variety of ferrous and non-ferrous materials
• Yellow Ring for cutting - Structural steels - mild steel, 250 and 350 plate, Free cutting steels, Unalloyed case hardened steels,  Heat treatable steels

HSS TECHNICAL DATA

• Made from High Speed Steel
• Standard  - DIN 371
• Tolerance - 2B
• Surface - Bright Finish
• Guhring No. 873