We use snatch blocks for a number jobs on the boat, mainly to redirect lines or jib sheets so that they align with the winches at a better angle.Two years ago we purchased a fancy new snatch block made by well reputed marine hardware manufacturer Harken. We chose this block because it was highly rated by independent tests and it had a higher Safe Working Load (SWL) than the other blocks we have on board. We wanted a strong block to use with our storm parachute anchor so that we could run a bridle to control it's angle off of the bow. At 1600 kilogram SWL the Harken block seemed up to the task.
Unfortunately the Harken block failed while being used on a much lighter job of controlling our small staysail sheet. We sent the block back to Harken and they quickly replaced it with a new one. However after only two weeks of use that block showed an abundant amount of rust and we are wondering just how safe it is. The rust seems to be coming from the mild steel roll pin that holds the shackle to the shaft. The picture shows one of the oldest blocks we use continusouly on board on the right side of the picture - it's 35 years old. Beside that is a block that is 8 years old and on the left is the new, two week old Harken block. Another reminder to keep all of our old parts as they generally are better than anything we can find new.
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