3M 7100136225 Dual Lock Reclosable Fastener SJ3440 Black

Product Description

The 3M 7100136225 is a plain-backed, no-adhesive reclosable fastener sold as the SJ3440 Dual Lock type, black in color, supplied in a 2-inch-wide by 50-yard roll. It features 250 mushroom-shaped stems per square inch with an engaged thickness of 4.1 mm. When two compatible Dual Lock surfaces are pressed together, the interlocking stems generate tensile strength sufficient to replace conventional mechanical fasteners. This product is used across industrial, commercial, and trade applications where a tool-free, repositionable, and repeatable mechanical closure is required.

The SJ3440 Dual Lock fastener is suited for use in transportation, electronics, business equipment, machinery, medical equipment, and sign and display installations. The plain-backed format is intended for applications where the installer will apply their own bonding method, such as welding, riveting, or a separately selected adhesive system. The 50-yard roll length supports high-volume installation runs and reduces material change-out frequency on larger jobs.

Key Features

• 250 stems per square inch for consistent, repeatable engagement across the fastener surface
• Engaged thickness of 4.1 mm provides a defined standoff between mated surfaces
• Plain-backed with no adhesive — allows installer to choose their own attachment method
• Interlocking mushroom stems generate tensile strength capable of replacing mechanical fasteners
• 2-inch width by 50-yard length supports high-volume or continuous-run applications
• Black color for low-visibility installations in dark or finished enclosures

Compatibility

Designed for use with compatible 3M Dual Lock reclosable fastener surfaces across transportation, electronics, business equipment, machinery, medical, and sign and display applications.

Installation Notes

Installation is typically performed by technicians or assemblers familiar with surface preparation requirements for the chosen secondary bonding method. Ensure mating surfaces are clean, dry, and free of oils or debris before securing the fastener. When pressing two Dual Lock surfaces together, apply even pressure across the full width to achieve consistent stem engagement. No power tools or power isolation is required for the fastener itself, but follow applicable safety protocols for the equipment or surface being serviced.

Technical Specifications

• Stem Density: 250 stems per square inch
• Engaged Thickness: 4.1 mm
• Width: 2 inches
• Length: 50 yards
• Backing Type: Plain, no adhesive
• Color: Black
• Weight: 6.2 pounds
• Unit of Measure: Roll
• UPC: 00021200658099

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100136225