Industrial Acme Fette UNR N-6 H33 thread rolling dies in size 1.375-12 are included as a 3-piece set for demanding threading work. They form external threads on cylindrical stock by rolling between dies rather than cutting, yielding a consistent thread profile for fasteners and other components. The UNR N-6 H33 designation specifies the thread form and hardness class, while 1.375-12 denotes the nominal diameter and 12 threads per inch.
