Capacity: 10 Ton. Spring return. Collar Thread: 2-1/4" - 14. Internal base thread: 1-1/4" - 11-1/2. 2 to 1 safety factor on material yield, designed and tested to meet ANSI B30.1. This Single-Action Spring Return Ram features threaded ram collars and internal base threads to simplify mounting. Also has threaded piston rod ends. OTC's design ensures positive, leak resistant sealing throughout all pressure ranges, yet full piston return characteristics are maintained. Additional bearing surface has been designed into this unit, to effectively resist the punishing stress exerted by off-center loads.