Expertly engineered for high-efficiency fine pitch threading in structural materials, the Guhring UNF Yellow Ring Spiral Flute Tap range is the definitive industrial choice for machine tapping blind holes. Operating on the standard 60° Unified fine thread profile, these premium high-speed steel (HSS-E) tools feature an advanced spiral flute geometry that shears material cleanly and pulls compact chips up and out of the workpiece. This reliable chip evacuation completely eliminates 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 taps are specifically optimized to deliver exceptional tool life and perfect pitch compliance when threading structural steels, mild steel, 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 374
• Tolerance - 2B
• Surface - Bright Finish
• Guhring No. 911