OTC 4106A 25-Ton Single-Acting Spring-Return Ram, 6-1/4" StrokeOTC 4106A 25 Ton Single Acting Spring Return Ram, 6 1 4" Stroke. This single acting, spring return ram has a capacity of 25 tons and a maximum working pressure of up to 10,000 PSI; a 2 to 1 safety factor on material yield; and is designed and tested to meet ANSI B30. 1. Standard stroke length of 6 1 4", this compact ram requires a minimum of mounting space. The ram features a threaded ram collar and internal base thread to simplify mounting. Also, it