3M™ Hook Fastener SJ3402 is one part of a two-part fastener solution designed to provide great durability for thousands of closures. The non-adhesive fastener is most commonly sewn, but can be attached with a variety of hot melt or liquid adhesives. This fastener allows for easy and convenient attachment to a variety of substrates. - 3M hook and loop fasteners offer great design flexibility, fast product assembly, smooth and clean exterior surfaces and excellent product performance in many applications. 3M hook and loop fasteners consist of hooks and loops which engage to form a quick fastening attachment.