Screw past the maximum adjustment of 6 inch. w/ a 2x4圆' piece of lumber placed between screw and handle for extraĬaution, the acme screw of the 4x4 GALVANIZED Scre Jack will completely separate from the acme nut if screwed out too far. Base Plate will not turn with screw and 4 holes are provided to secure it to a solid foundation.Screw is Greased for easy tuning and to prevent rusting.15-1/2 inch Overall Height (screwed down).This will insure that the threads of the acme nut will be used to support a heavy load. Screw past the maximum adjustment of 6 inch. w/ a 2x4圆' piece of lumber placed between screw and handle for extra leverage.Ĭaution, the acme screw of the 4x4 GALVANIZED Scre Jack will completely separate from the acme nut if screwed out too far. Proper bracing required Prevent lateral shifting.Base Plate will not turn with screw and 4 holes are provided to secure it.Screw is Greased for easy tuning and to prevent.It is strength in a small package, when time is of the essence. With it's ability to fit in tight spaces to stabilize concrete slabs or steel beams, the Ellis Bridge Jack is a versatile toolįor downed buildings and reinforcement in small areas. Search and Rescue teams also know the value of the Ellis Bridge Jack. (BJ-12) of adjustment to screw it into position. Just install the Bridge JackĪt its closed height of 10in (BJ-3), 13in (BJ-6) or 19in (BJ-12) and use the 2.5in (BJ-3), 5in (BJ-6) or 11in Aįavorite of contractors, they fit directly under concrete slabs or beams in tight spots, under homes or modular buildings as well as with timbers for shoring projects. With this kind of hardware, it's no surprise that the Ellis Bridge Jack / Modular Building Jack can support loads up to 80,000 pounds. before failure occurred! Pictured right is the BJ-6 inside the testing lab.Īlthough the Bridge Jacks were tested to over 200,000 lbs., we recommend applying a 2.5 to 1 safety factor when gauging the load capacity of these jacks. We tested the Bridge Jacks to over 200,000 lbs. Also, 4 - 9/16 inch holes (spaced 1-1/2 inch OC from each edge) have been added to the Base and Support, gussets on the top and the bottom plate have been added with full length welds. The top plate has been attached to swivel freely, allowing the screw to be turned with ease. The Ellis Bridge Jacks while weighing 45 lbs. For extra leverage, a 1 inch steel rod can also be used when turning the screw. Measuring 1/2x 8x8 inch (BJ-3) or 1/2 x 9 x 9 inch (BJ-6 & BJ-12) for support, the Acme Screw is 2 and a 1/2 inch in diameter and greased for easy turning and capable ofĮxtending a full 2.5in (BJ-3), 5in (BJ-6) or 11in (BJ-12). For a rugged and durable piece of hardware in the Ellis line, none get it done like the Ellis Bridge Jack / Modular Building Jack.

Scaffold jacks for 4x4 post