Industrial-grade reclosable fastener with interlocking mushroom heads, 170 stem density, non-adhesive backing, 50-yard roll, 1000 closure cycles, suitable for hot melt, epoxy, or liquid adhesive attachment.
The 3M™ Dual Lock™ Reclosable Fastener SJ3442 is an innovative fastening solution featuring black, interlocking mushroom-shaped heads with 170 stem density per square inch. This product delivers strong, reliable, and durable fastening that can be opened and closed multiple times, making it an ideal alternative to traditional fastening methods such as screws, nuts, and bolts. The fastener is designed for industrial and occupational use, providing a snug fit with a smooth aesthetic appearance while maintaining exceptional strength through its unique interlocking design.
The SJ3442 comes in a convenient roll format measuring 0.75 inches in width and 50 yards in length, with 2 rolls per case. It features a non-adhesive back, allowing for flexible attachment using hot melt, epoxy, or liquid adhesives. The fastener produces an audible snap when secure, verifying proper closure of the attachment. With a closure life of 1000 cycles, this product maintains its strength throughout multiple attachments and detachments, offering long-lasting performance for demanding applications.
Designed for both indoor and outdoor use, the 3M™ Dual Lock™ Reclosable Fastener SJ3442 mates with Type 250 or Type 400 stem densities to provide different strength combinations tailored to specific project requirements. The backing material is made from durable polyolefin, and it offers good temperature resistance up to 200°F (93°C). This lightweight alternative to metal fasteners remains hidden beneath surfaces, providing design flexibility without interfering with material integrity.
Key Features
- Interlocking mushroom-shaped heads with 170 stem density per square inch for strong, reliable fastening
- Reclosable design allows opening and closing hundreds of times with maintained strength and 1000 closure cycles
- Non-adhesive back compatible with hot melt, epoxy, and liquid adhesives for flexible attachment options
- Produces audible snap when secure, providing verification of proper closure and attachment
- Compatible with Type 250 and Type 400 stem densities for customizable strength combinations
- Temperature resistant up to 200°F (93°C) for both indoor and outdoor applications
- Hidden fastener design provides smooth aesthetic appearance without interfering with material integrity
- Lightweight alternative to metal fasteners with no drilling or screwing required
Technical Specifications
| Specification |
Value |
| Product Number | SJ3442 |
| Overall Width (Imperial) | 0.75 inches |
| Overall Width (Metric) | 19.05 millimeters |
| Overall Length (Imperial) | 50 yards |
| Overall Length (Metric) | 45.72 meters |
| Product Form | Roll |
| Product Color | Black |
| Adhesive Type | Non-adhesive |
| Backing Material | Polyolefin |
| Stem Density | 170 stems per square inch |
| Engaged Thickness (Imperial) | 0.16 inches |
| Engaged Thickness (Metric) | 4.1 millimeters |
| Maximum Operating Temperature (Fahrenheit) | 200°F |
| Maximum Operating Temperature (Celsius) | 93°C |
| Closure Life | 1000 cycles |
| Units per Case | 2 rolls |
| Smallest Saleable Unit | Roll |
| Flame Retardant | No |
| Brand | 3M Dual Lock |
| UPC Code | 00021200863714 |
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