Block and Tackle Pulley System for Lifting Objects - SoB 4000LB Breaking Strength with 65 Feet of 3/8" Rope - 7:1 Lifting Power - Heavy Duty Rope Hoist Pulley System for Garage Warehouse Construction

Works great really great quality

I got this to lift a/c units up into a ceiling. Light lifts and short distances. Worked like a charm. Runs smooth. Didn't tangle. I used a cleat to hold the rope while I was working.Will it lift 4000 lbs? Maybe, but not without a winch to pull the rope. What could I hook it to that will hold 2 tons plus a safety factory of 2? Dragging something I might give a try. That brings me to why I replaced the rope.For the price I would buy again.A 3/8" twisted nylon rope is plenty strong but nylon stretches a lot. If I have 4000 lbs of tension on it what I've made is a giant slingshot. If something breaks there will be parts flying about. I put a 3/8" by 100' Dacron climbing rope on it. The Dacron rope doesn't stretch and recoil the way nylon does and I got some more lift length. The rope did cost as much as the pulley system but safety first.

I replaced the bolts through the nylon pulleys with a 3.5" 5/16 bolt so there was enough shoulder to reach all the pulleys. The reason being with the shorter bolt that came with it the side pulley by the nut is riding on threads rather than the smooth bolt shoulder. I can see this end pulley binding and wearing out very quickly unless a longer bolt is supplied. I also sprayed the new bolt with dry moly lube to help the nylon pulleys ride a little smoother and hopefully wear a little longer.I also attached the rope end to the bottom bolt of the top pulley assembly to improve the ratio to 8:1. It also evens out the weight distribution. The rope itself is not very high quality and is only 1/4" and not 3/8" as advertised. But it does seem to be adequate enough with around a 100 lbs. safe working limit resulting in up to 800 lbs. considering the 7/8:1 leverage. As such, there is no way I would attempt much over 800 lbs. and certainly not 4,000 lbs.Also, as others have done, I installed lock washers and even some Loctite on all the bolts.For the money, under $9 for mine, I don't see how one can go wrong. Use it for projects under 800 lbs. and it should perform fine.kd

I got this to replace a 2-pulley system which I’d used to raise and lower a 350 lb. foldable utility trailer. When using the 2-pulley system , I was fraught with anxiety due to how very hard I had to pull to get the trailer raised. This 4-pulley system allows me to much more easily raise and lower the trailer, reducing both the physical and mental stress on me.The issue of the rope twisting was easily remedied by taking my time running it through my gloved hands a number of times, until it stopped untwisting. I did this with the block & tackle mounted at the ceiling, with the two blocks up against one another. It will now hang with the lower block pulled all the way down without twisting, unlike before I untwisted the rope. Hope this helps.

So this was my second purchase of this item, the first being several years ago. The first one I used to lift laminated beams (100+ lbs) up 13 feet to place on top of several posts. The second time I used them to hoist 12 rebar cages (150-200 lbs) down into some holes for concrete pier footings. While it’s been years between the two uses, I find that the first set was much more easier to life due to less resistance between the rope and pulleys—the second set required a lot of effort to lift. While these pulleys worked for what I needed, they do feel cheap and in no way feel comfortable (safety wise) lifting anything over 1,000 lbs, let along the 4,000 lbs rating as listed on the box. If you need to lift something heavy up a considerable height, for the price these are worth it.

As delivered, I'd rate it 2 orf 3 stars (see others' low-star reviews for all the reasons). The reason I ordered it is that to buy a high-quality 4-sheave block and tackle would have cost a LOT. With this, for about $20, you get the basic components that can be cheaply modified to make a pretty good system. One thing I was pleasantly surprised about is that the blocks were a lot bigger than I imagined: they are about 4.5" long and 2.5" wide. Here are the most important mods I made:1. Replace the rope with a less-stretchy, less twisty rope. I bought a 70' length of 1/4" "starter cord".2. Replace all the regular nuts with nylon locking nuts. You'll need an additional 6 of them if I recall correctly (they are metric, 8mm)3. Sand the outer edges of the pulleys to make them smoother for less friction.4. Add an 8mm washer to each side of each pulley and each spacer. You'll need 48 8mm washers to do this. This is really important, since it greatly reduces friction on the pulleys.5. To accomodate the extra width caused by inserting the washers, you'll need to replace the 3 bolts in each block with 8mm bolts that are 90mm long. So you'll need 6 8mm x 90mm hex bolts to do this.6. Use silicone lubricant to lubricate the pulleys and their washers.7. Tie the end of the rope to the bottom of the upper block to get an 8:1 advantage instead of just 7:1.IMPORTANT NOTES:(1) If you get the model where there are 2 dimples on each sheave plate, you must orient the pulleys so the side with the smaller hub is facing the dimples.(2) Don't over-tighten the lock nut on the two pulley bolts, or you'll squeeze the pulleys between the sheave plates, causing unacceptable friction.That's about it :-)

price is good ease of operation a real page turner