Failure test of homemade buckle

[BillyBob58]

nope, both are breaking strength. heavy wt polypro has a breaking strength of 700-800# per inch of width depending on where you get it. that means 2" would be 1600# and 1/2" would be 400#

the strapworks is 3500# is the break strength as well.

i haven't seen any webbing rated on a safe working load, except everything sold at home depot or walmart etc...

line is only stronger than webbing for it's weight b/c you can get line made from spectra and vectran. webbing usually comes in polyester/nylon/polypro, which is all weaker # for # than high tech fiber. this is the main reason, i'm sure there is some strength difference between a 12 strand braid and a webbing weave, but the main difference is from the fiber it's made of.

All of which still leaves me surprised that the 1200 lb line broke before the 700lb webbing. Particularly since it broke in the middle instead of at the knot.

Of course, there are always many other variables, sometimes unknown ones, such as wear or exposure to elements. Or, I suppose, even a bad batch from the manufacturer or normal manufacturer tolerances.

[warbonnetguy]

that is odd. i've heard of other spectra breaking in the middloe of the line rather than the knot. the numbers themselves make sense otherwise. 1200# line with knot=600#, which should be weaker than 700# webbing with stitches rather than a knot, as stitched webbing should keep almost all it's strength.

the location of the break is a bit confusing though.

[Patrick]

The line wasn't worn, it was right off the roll as was the webbing. I still need to break that buckle, so I'm happy to execute any more tests you guys come up with.

[jeffjenn]

Patrick, how much does each buckle weigh, & where did you get the alum.?

[Patrick]

I don't have a very precise scale, just a dial kitchen one. Two rings and two buckles weigh just under 2 oz., so about half an ounce.

I ordered the AL from http://www.onlinemetals.com. It was $15 or $20 for two big pieces shipped. If I were to do it again, I'd get the 1.5" wide stock and just use that width.

[Patrick]

Ah, check that. I would NOT go to 1.5". I knew there was a reason I used a weird size. It has to fit through my SMC ring and 1.5" looks to be just a little big for that. As is, it fits through great.