First, these are Blocks, there is no Tackle - (rope or cable); also, these are NOT snatch blocks as some have suggested. Snatch blocks have a hinged side-plate to give you direct access to the sheave. Second, if the blocks weigh 45 pounds each, then they are for CABLE not rope. I have single, double, and triple sheave blocks for 1 inch diameter rope and none of them weighs over 10 pounds. Carefully examine your blocks, there should be a weight rating (maximum weight, or safe working load) stamped on either the side-plate or the strap on each of the blocks.
Re: Block and tackle or something else? in reply to Dr. Walt, 02-17-2013 02:21:22
Some may argue that top one in this picture is not a snatch block, but it is. It is a little inconvenient as you have to remove the pin and pulley to "snatch" it on to a "cable". Yes, "cable" also known as wire rope. Cable cars are strung from cables, right? It is my favorite because of its compact size.
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