- For use with Martin Spacer Coupling (SC) type Quadra-Flex series flexible coupling assemblies (sold separately)
- High carbon steel for better wear and longer life over hubs made from steel alloys with less or no carbon, or non-steel alloys
- Available in regular (H type) or short (HS type) lengths to accommodate the spacing requirements of the application
- Attaches to SC type spacer flanges with four bolts
