Hello! I have a sling bag that I really like, but the strap doesn’t take it as close to my body as I would like. I have a sewing machine, but I have never used it for stitching seatbelt webbing. What sort of needle would I need to use, and which type of thread would be best suited for the material?
You can try a heavy duty needle, but there’s a pretty good chance a domestic sewing machine just won’t work with seatbelt webbing. I’d recommend caution
It should be fine, seat-belts aren’t that thick. I’d use size 69 bonded nylon or polyester thread.
I’ve used a regular machine with a denim needle to sew a couple nylon webbing layers together. I don’t know how sturdy you need the thread to be but general utility thread should work for a basic bag, or you could get a spool of Gudermann(?) thread for a step up.
