BISupply Screw Jack Post 1 Pack - Temporary House Jacks for Leveling 4x4 Crawlspace Basement Shore Beams

screw is hard to turn but turning the screws before use loosens them up very sturdy used them to support garage roof.

I ordered these for a foundation repair project I'm doing, I was going to get the Ellis ones but they're twice the cost and still are just manufactured in china, so I went with these since they're cheaper. When they came I put some Vaseline on the threads and completely unscrewed them so they would be easy to turn. The section of sill plate I'm holding with these is 9' above the dirt, I'm using 2 2x4s with 3/4 scrap ply in between which is way cheaper than buying 4x4 posts.

I bought this to jack-up and hold up a corner of my outdoor pergola so that I could replace a rotting post on that corner. But my plan to do so with this post-holder didn't work as the "screw" on this post-jack that I expected to turn to raise my temporary post just doesn't turn. Like others have said, the threading just doesn't work and nothing turns without massive effort, and then just gets stuck. I'd return this unit but I waited for cold and snow to go away before I tried it, and by then a little too much time had gone by and I missed the Amazon return window.

I had a pole barn with a rotting pole that I needed to fix, and these helped quite a bit. I got some 4x4x10' and used it to support the barn while I dug the old pole out, poured a footing and replaced it. These things worked, but there are 2 important things to understand: 1. These are not jacks. You cannot lift with them. You brace with them. I had a loader on a tractor and a chain, which I lifted the bad post with and then put these braces in. Had I not used a loader, I would have had to use a car jack or something to lift the barn, then put these braces in. I'll say it one more time - you cannot lift with these things - you jack up what you want to brace (with something else) then put these under it and raise them until snug and then remove the jack. 2. As with many things in life, if you lube them they will be a lot easier to screw. If you don't lube them, screwing them will be an exercise in frustration, causing the shafts that you use to screw them to bend and making it almost impossible to put where you want them. I would strongly recommend getting some axle/bearing grease when you get these. Then, remove the base plate and screw completely from the 4x4 receiver. I put on a rubber glove and put axle grease along the shaft and threads of the screw and then screwed the screw in. Wipe off the excess, and these things will last forever. If you don't do this, they will not screw properly and the bars will warp, threads will grind and strip and they won't last long at all.

Paired with a hydrolic jack these did an amazing job keeping my kitchen up in a crawlspace before repair. Can be flipped upside down and used that way for a larger base that does not sink as well (but I'm not a safety expert and don't know how serious my osha violations are lol)

So, yes, drawbacks and advantages... Pro, the bar compared to the welded-in bar on the Akron, is better. Pro, the threaded portion I think is longer. Pro, the threads are not painted like they are on the Akron! Con, the pocket for the 4x4 is way way too big - it is going to necessitate a shim, maybe a 1/4" bit of plywood nailed onto two sides. Just trusting the nail holes is _not_ good enough for these kinds of applications - basically the 4x4 is going to have to be expanded on the end from 3.5" to about 3.8" or so... Now, the _Akron_ product has it's own hassle, they paint the threads on those, so you have to force it with wd40 in a vise for 10 minutes before it is usable. Sigh. Not sure which is worse - having to force the paint off the threads on the other one, or having to shim this one by jamming in some thin plywood. I'm giving them both three stars, probably should both be 2 stars. Both of these problems are ridiculous - all 4x4s are basically the same size, why would this be so wobbly-large? And, why paint the threads on the other product? The other one is better once you fix it by working the threads in a vise, but this one is probably less effort to get into use. Plus, I think it has more thread-adjustment-range...

I used a treated 4x4 from Home Depot and it had quarter inch of extra space on two sides of the enclosure. Based on the other reviews I disassembled and lubricated the screw with a dry lube prior to using it. This makes it much easier to use. The included bar provided enough leverage to raise the foundation in the areas where it was needed.

As noted in other reviews, quality control is severely lacking. The threading was so poorly done that the jack screw was nearly impossible to turn. Ended up having to purchase a rethreading die (M30-3.5) to chase the threads just to get it marginally functional. Tried contacting manufacturer via their website and never got a reply.

Our backyard deck had a noticeable sag in the middle and we used this jack to add a post and additional support. It corrected the sag and now the deck looks great. Easy to use and durable. Price point was very reasonable. Would recommend!