3M Dual Lock Type 250 reclosable fastener with interlocking mushroom heads providing 5X tensile strength. Reusable hundreds of times with audible snap closure. 1 inch x 50 yards per roll, 2 rolls per case.
The 3M™ Dual Lock™ Reclosable Fastener SJ3540 is an innovative fastening solution designed to replace traditional screws, nuts, and bolts. Featuring interlocking mushroom-shaped heads with 250 stem density per square inch, this fastener delivers exceptional strength with up to 5X the tensile strength of typical hook-and-loop products. The synthetic rubber-based black PE foam tape is protected by a removable film liner and features quick stick adhesion with a short dwell time, making installation fast and efficient without requiring drilling, screwing, or sewing tools.
This reclosable fastening system can be opened and closed multiple times while maintaining its strength throughout hundreds of reattachments. The fastener produces an audible snap when secure, providing verification of closure, and can be easily disengaged by simply peeling the pieces apart by hand. With a maximum operating temperature of 120°F (49°C) and an engaged thickness of 226 mil, the SJ3540 is best suited for indoor applications including access panels, interior signage, decorative trim, office partitions, and product identification.
The 3M Dual Lock SJ3540 comes in a convenient 2 roll per case package, with each roll measuring 1 inch wide by 50 yards long. The synthetic rubber-based adhesive bonds exceptionally well to a variety of substrates including low surface energy plastics such as polyethylene and polypropylene. This pressure-sensitive fastener mates with Type 170, Type 250, or Type 400 stem densities to provide customizable strength combinations for different project requirements. As an industrial-grade product, it provides a lightweight alternative to metal fasteners while remaining hidden beneath surfaces and maintaining material integrity.
Key Features
- Interlocking mushroom-shaped heads with 250 stem density per square inch for exceptional strength
- Reusable for hundreds of attachments and detachments without strength degradation
- Audible snap verification when fastener is securely closed
- Synthetic rubber-based adhesive bonds to low surface energy plastics and diverse substrates
- Quick installation without drilling, screwing, or sewing tools required
- Compatible with Type 170, 250, and 400 stem densities for customizable strength combinations
- Removable film liner with quick stick adhesion and short dwell time
- Lightweight alternative to metal fasteners providing aesthetic improvements
- Maximum operating temperature of 120°F (49°C) suitable for indoor applications
- Easily disengaged by peeling apart by hand without damage to substrates
Technical Specifications
| Specification |
Value |
| Product Number | SJ3540 |
| UPC Code | 00021200658129 |
| 3M ID | 7000001980 |
| Overall Width (Imperial) | 1 in |
| Overall Width (Metric) | 25.4 mm |
| Overall Length (Imperial) | 50 yd |
| Overall Length (Metric) | 45.72 m |
| Product Form | Roll |
| Stem Density | 250 per square inch |
| Adhesive Type | Synthetic Rubber |
| Adhesive Color | Black |
| Backing Material | Polyolefin (PE Foam) |
| Primary Liner | White Polyolefin |
| Primary Liner Thickness (Imperial) | 5 mil |
| Primary Liner Thickness (Metric) | 0.13 mm |
| Engaged Thickness (Imperial) | 226 mil |
| Engaged Thickness (Metric) | 5.8 mm |
| Maximum Operating Temperature (Fahrenheit) | 120°F |
| Maximum Operating Temperature (Celsius) | 49°C |
| Closure Life | 1000+ cycles |
| Indoor/Outdoor | Indoor |
| Flame Retardant | No |
| Units per Case | 2 rolls |
| Smallest Saleable Unit | Roll |
| Brand | 3M Dual Lock™ |
| Tensile Strength | Up to 5X typical hook-and-loop products |
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