3M 7000049792 Dual Lock Reclosable Fastener SJ3870 Black

Product Description

The 3M 7000049792 is a Dual Lock Reclosable Fastener sold under the SJ3870 series, designed for tool-free, reusable mechanical attachment in both indoor and outdoor applications. The fastener features a black polypropylene mushroom-stem surface bonded to a modified acrylic pressure-sensitive adhesive backing. With 250 stems per square inch, it delivers consistent closure engagement and a rated closure life of 1,000 open-and-close cycles. The engaged thickness measures 0.24 inches. It comes in a continuous roll format measuring 0.75 inches wide by 45 yards long, making it well suited for cutting to custom lengths on the job or in production.

This fastener is appropriate for residential and commercial installations where a removable, repositionable, or repeatedly opened panel, cover, or component is needed. It performs reliably across medium-temperature environments up to 180 degrees F. Compatible substrates include many plastics such as polyethylene, acrylic, polycarbonate, and ABS, as well as powder-coated painted surfaces and medium to low surface energy materials. HVAC technicians, electricians, and panel fabricators commonly use this type of fastener for wire management covers, access panels, filter frames, and equipment enclosures.

Key Features

• 250 stems per square inch for consistent, repeatable mechanical closure
• Rated closure life of 1,000 open-and-close cycles
• Modified acrylic adhesive backing for direct peel-and-stick application
• 0.24-inch engaged thickness accommodates typical panel gap tolerances
• Temperature resistance up to 180 degrees F for medium-temperature environments
• Roll format at 0.75 inches x 45 yards allows field or shop trimming to required lengths

Compatibility

Designed for bonding to many plastics including polyethylene, acrylic, polycarbonate, and ABS, as well as powder-coated painted surfaces and medium to low surface energy materials, for both indoor and outdoor use.

Installation Notes

Clean and dry the substrate surface before applying the adhesive-backed fastener to ensure full bond contact. Apply firm pressure along the full length of the strip after placement to activate the acrylic adhesive. Allow adequate dwell time before loading the fastener with any mechanical force. Cut to length using scissors or a utility knife; avoid stretching the roll during handling as this may distort stem alignment.