IS THIS A SCREW ADJUSTABLE JACK?
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It has two retaining bolts to set the base height, then the top portion screws up or down for the fine tuning.
Was this Answer Helpful ?Well, more precisely, it is a TELESCOPIC screw adjustable support jack. Telescoping jacks should be used for additional support, not the primary means of support (see the pdf.) They are also known as "tele posts," "sectional columns," "double-sectioned columns," "jack posts," or "jacks." They come in two hollow steel tube sections where a smaller diameter tube is fitted into a larger diameter tube and the sections are held in place with steel supporting pins which pass through the pre-drilled holes of both tubes. Telescoping adjustable columns are regularly used in construction to adjust or level a structure before installing a permanent column which is similar but is NOT telescoping. They can be used as supplemental (not primary) support. You may also want to go look at item 97323 Adjustable Steel Column just to get the idea. Hope this answer helps!
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Was this Answer Helpful ?Yes. Larger adjustments made by sliding one tube within the other and securing them in place with two HD bolts. Finer adjustments with a HD screw at the top of the jack.
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