3M 7000049435 Dual Lock Fastener SJ3870 250 Black 1/2 in X 45 Yd

Product Description

The 3M 7000049435 is a Dual Lock reclosable fastener sold as a continuous roll measuring 1/2 inch wide by 45 yards long. The fastener features a black polypropylene mushroom-stem profile with 250 stems per square inch and an engaged thickness of 0.24 inches. A modified acrylic adhesive on the backing bonds the strip directly to a substrate without mechanical fasteners. Rated for a closure life of 1,000 cycles, this fastener is suited for repeated attach-and-release applications in both indoor and outdoor environments. HVAC service technicians, electricians, and industrial installers use this product to secure panels, wire looms, nameplates, and lightweight components.

This fastener is designed for medium-temperature applications up to 180 degrees F, making it appropriate for non-heat-source surfaces in residential and light commercial HVAC equipment enclosures, electrical panel accessories, and general trade installations. It bonds to many common plastics including polyethylene, acrylic, polycarbonate, and ABS, as well as powder-coated painted surfaces and medium to low surface energy materials. The roll format allows field technicians to cut strips to the required length on the job.

Key Features

• 250 stems per square inch for consistent, repeatable closure force
• Modified acrylic adhesive backing for direct surface bonding without tools
• Rated for 1,000 open-and-close cycles
• Temperature resistance up to 180 degrees F for indoor and outdoor use
• Compatible with polyethylene, acrylic, polycarbonate, ABS, and powder-coated surfaces
• Continuous roll format allows field-cut lengths

Compatibility

Bonds to many plastics including polyethylene, acrylic, polycarbonate, and ABS, as well as powder-coated paints and medium to low surface energy materials. Designed for use with a mating Dual Lock strip of the same or compatible stem count.

Installation Notes

Surface must be clean, dry, and free of oils or dust before applying the adhesive-backed strip. Press the fastener firmly along its full length to maximize adhesive contact. For outdoor or high-vibration installs, allow full adhesive cure time before placing the assembly under load. No special tools are required, but a roller or firm thumb pressure improves bond strength on textured surfaces.

Technical Specifications

• Width: 1/2 inch
• Roll Length: 45 yards
• Stem Density: 250 stems per square inch
• Engaged Thickness: 0.24 inches
• Closure Life: 1,000 cycles
• Temperature Resistance: 180 degrees F
• Adhesive Type: Modified acrylic
• Fastener Material: Polypropylene
• Color: Black
• Weight: 0.7 pounds
• Unit of Measure: Roll

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000049435