3M™ Dual Lock™ Reclosable Fastener SJ3440 is black, with 40 mushroom shaped stems / cm² and an engaged thickness of 4 mm. Our reclosable fastener is plain backed with no adhesive.
Watch our strong pressure adhesive 3M™ Dual Lock™ Reclosable Fastener SJ3440 bond on contact, and hear an audible snap as its being used. With resistance to high temperatures, solvents and contamination, it’s the ideal alternative to traditional fastening methods such as screws, nuts or bolts. Our black, plain backed, no adhesive fastener has 250 mushroom shaped stems per square inch. It bonds strongly on contact with materials used.