When needs worm gear screw jacks for pivoting a load, needs trunnion adapters with swivel pins. They are directly bolted to the corresponding base of screw jacks for pivoting a load. Available screw jacks models from smallest 0.25 ton to 25 ton, larger jack models, please consult us. Note: Trunnion adapters mounted to inverted jacks will decrease the minimum closed dimension and may shorten the travel. Trunnion Adapters Dimensions