A single lock ring serves as a safety wire, holding the pins, block, and hubs together. Releasing the spring lets technicians replace components of the U-joint in less than 2 min — without special tools. They are available in ODs from 7/8 to 4 in., with torque capacities from 1,800 to 131,000 lb-in.

Curtis Universal, Box 70038, 4 Birnie Ave., Springfield, MA 01107-0038, (888) 287-8477, curtisuniversal.com