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.
- Mushroom shaped stems, plain backed with no adhesive
- Type 250 mates to Type 170, 250 or 400
- Five times the tensile strength of typical hook-and-loop fasteners
- Opens and closes 1000 times before losing 50% of its original tensile strength
- Stems snap in place to ensure fastener is engaged
- Resists high temperatures, solvents, contamination and corrosion when fastening
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