3M 7100045019 Dual Lock Reclosable Fastener SJ3440 Black

Product Description

The 3M 7100045019 is a plain-backed, non-adhesive reclosable fastener tape sold as a 6-inch-wide by 50-yard roll. The SJ3440 type features 250 mushroom-shaped stems per square inch and an engaged thickness of 4.0 mm. When two mating surfaces are pressed together, the interlocking stems generate tensile strength high enough to substitute for screws, rivets, and other mechanical fasteners. This product is black and ships as a single roll. Installation is handled by fabricators, maintenance technicians, and assembly professionals across a wide range of industries.

The SJ3440 has seen broad use in transportation, electronics, business equipment, machinery, medical devices, and sign and display applications. The plain-backed format is suited for situations where the installer will apply their own adhesive, use heat bonding, or mechanically attach the tape to a substrate. The 6-inch width accommodates wide-area fastening needs, and the 50-yard roll length supports high-volume production or large-format installations.

Key Features

• 250 stems per square inch for high-engagement tensile strength
• Engaged thickness of 4.0 mm for positive interlock feedback
• Plain backed with no adhesive, allowing custom bonding methods
• Black color suitable for visible or concealed installations
• 6-inch-wide by 50-yard roll format for wide-area or bulk use
• Compatible mating surface design allows same-type-to-same-type closure

Compatibility

Designed as a general-purpose reclosable mechanical fastener for use across transportation, electronics, business equipment, machinery, medical, and sign and display applications where a non-adhesive-backed format is required.

Installation Notes

Installation is typically performed by fabricators, assembly technicians, or maintenance personnel familiar with mechanical fastening and surface preparation. Because this fastener is plain backed, the installer is responsible for securing it to the substrate using an appropriate adhesive, heat weld, or mechanical method suited to the application surface and environmental conditions. Ensure both mating surfaces are clean and free of debris before engagement. Avoid overstretching the tape during handling, as deformation of the stems can reduce tensile performance.

Technical Specifications

• Stem Density: 250 stems per square inch
• Engaged Thickness: 4.0 mm
• Width: 6 inches
• Length: 50 yards
• Color: Black
• Backing: Plain, no adhesive
• Unit of Measure: Roll
• Weight: 15.39 pounds
• UPC: 00048011579122

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100045019