Expertly engineered for high-efficiency coarse pitch threading in structural materials, the Guhring UNC Yellow Ring Spiral Flute DIN 371 Tap range is the definitive industrial choice for machine tapping blind 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 provides maximum torsional rigidity and eliminates tool deflection in smaller nominal diameters. The advanced 40° right-hand spiral flute geometry cleanly shears material and pulls compact chips up and out of the workpiece, completely removing the risk of chip packing and catastrophic tool breakage at the bottom of deep pockets. 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 blind holes 
• Great for cutting new threads
• Suited for use in a variety of ferrous and non-ferrous materials
• Yellow Ring for cutting - Structural steels like mild steel, 250 and 350 plate, Free cutting steels & Unalloyed case hardened steels

HSS TECHNICAL DATA

• Made from High Speed Steel
• Standard  - DIN 371
• Tolerance - 2B
• Surface - Bright Finish
• Guhring No. 876