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4PC machinist jack set 6" to 7-1/4" cast aluminum


Four jacks. I think these are machinist jacks used to level or position larger pieces being worked on. Minimum height is 6" Maximum height is 7-1/4". These seam to be very fine threaded screws, it takes several rounds to extend these just 1-1/2". Cones shape body tapers from 1.700" at the top to 2.300" at the bottom. the adjustment post is 1-1/8" in diameter. The bottom of the jack has a stud that protrudes approx 1/4" from the bottom of the jack. I imagine this is to bolt the jack to a work table or machine bed. The stud is threaded 1/2-13 NC. The adjustment post has a 1" bolt shaped head for adjustment under load. All work freely.