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Home » Manual Worm Gear Screw Jacks
Manual Worm Gear Screw Jacks
Manual worm gear screw jack is one type of hand wheel screw jacks. This manual screw jack is a screw jack(worm gear) with a hand wheel or crank handle. It is only suitable for self locking machine screw jacks. Note: Ball screw jacks are not recommended to operate by manually, because it has not self lock, will creep down and cause dangerous happen. 

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