We were wondering just how strong the straps buckle is. How does it compare to tying a knot? We had our local tension testing facility pull some straps with buckles of various types. Here is what we found:
Woven cord straps buckle averaged 60% joint efficiency
Composite cordstrap buckle averaged 75% joint efficiency
Ladder style straps buckle averaged 90% joint efficiency
The easiest (and cheapest) way to tie the knot with strapping is using a buckle. Companies like Allstrap stock all kinds of buckles. If you need non-metallic you can use a plastic buckle (for 1/2″) .
The standard wire buckle is metal wire that is bent to look like a pretzel (top in lower pic)
The most unusual buckle is a one leg up, one leg down (bottom in lower pic).