Acro Jack
An Acrow prop or BS prop is a piece of construction equipment. It is a telescopic tubular steel prop, used as a temporary support. A jackscrew is similar but not as long and not telescopic. Acrow props are adjustable for height in two ways: a loose pin through a series of holes in the inner tube gives a wide range of coarse adjustment and a large diameter screw thread formed on the outside of the tube itself provides a fine adjustment over a short range. The screw thread also allows the props to be tightened when already in place, to adjust the load that each one bears.
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An Acrow prop or BS prop is a piece of construction equipment. It is a telescopic tubular steel prop, used as a temporary support. A jackscrew is similar but not as long and not telescopic. Acrow props are adjustable for height in two ways: a loose pin through a series of holes in the inner tube gives a wide range of coarse adjustment and a large diameter screw thread formed on the outside of the tube itself provides a fine adjustment over a short range. The screw thread also allows the props to be tightened when already in place, to adjust the load that each one bears.
