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Mechanical Lifting & Positioning Equipment
Threaded Screw Design Mechanical advantage is gained by using a specialized Acme threaded screw. Methods of ... SJ SC S PJ 10,9 - 21,8 10,9 - 21,8 2,7 1,8 - 7,3 9 - 12 SER PP 18,1 9,1 13 - 14 SE BE RS-----3,6 15 - 16 SLB IB ... RATCHET JACKS RJ Series 4,5 - 18,1 Tonnes Multiple-toothed pawls provides greater contact with rack bar.
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