3M 7000001981 Dual Lock Reclosable Fastener SJ3540 Black

Product Description

The 3M 7000001981 is a dual lock reclosable fastener sold as a continuous roll, designed to provide a firm, tool-free mechanical closure for mounting, bundling, and securing applications. The fastener features a rubber-based pressure-sensitive adhesive backing on a black polypropylene substrate. With 250 stems per square inch and an engaged thickness of 0.23 inches, it delivers consistent closure force across the contact area. The roll measures 2 inches wide by 50 yards in length and weighs 7.5 pounds. Rated for up to 1,000 closure cycles, this fastener is installed by HVAC technicians, electricians, and general trade professionals who need a reliable, repositionable mechanical attachment without fasteners or tools.

This fastener is suited for indoor use in residential and light commercial environments where a reusable, low-profile mechanical bond is required. It adheres to a wide range of substrates including acrylic, polycarbonate, ABS, powder-coated painted surfaces, and low-surface-energy materials such as polypropylene and polyethylene. Common applications include panel retention, wire harness management, equipment cover mounting, and fixture attachment in controlled indoor environments where temperatures do not exceed 120 degrees F.

Key Features

• 250 stems per square inch for consistent mechanical closure force
• 0.23 inches engaged thickness provides a low-profile lock
• Rated for up to 1,000 open and close cycles
• Rubber-based adhesive backing bonds to a broad range of plastics and coated surfaces
• 2 inches wide by 50 yards continuous roll for flexible cut-to-length installation
• Black polypropylene construction — indoor use only, rated to 120 degrees F

Compatibility

Bonds to acrylic, polycarbonate, ABS, powder-coated paints, polypropylene, and polyethylene surfaces. Intended for indoor use only. Not rated for outdoor or high-temperature environments exceeding 120 degrees F.

Installation Notes

Surface preparation is critical — clean and dry both mating surfaces before applying the adhesive-backed fastener to ensure full bond strength. Apply firm pressure across the entire strip after placement to activate the adhesive. This product is for indoor use only; do not install in locations subject to moisture, UV exposure, or temperatures above the rated limit. Cut to length using a utility knife or shears on a stable surface.