Rd (knuckle thread)

Rd (knuckle thread)

The round thread is a knuckle thread, shaped to ensure it is not susceptible to dirt to ensure low maintenance. Common applications: Coupler shafts on railway vehicles, brake rods, respirators.

Machine taps for knuckle threads

Knuckle thread screw taps are suitable for materials will good machinability up to 900 N/mm², non-alloy and low-allow steels, and for through and blind holes.

  • Taps for knuckle threads (Rd) acc. to DIN 374
  • Machine taps Rd 8 – Rd 44

VOELKEL Thread-cutting tools