Industrial-grade reclosable fastener with interlocking mushroom heads, 400 stem density, non-adhesive back, 1000 cycle closure life, temperature resistant to 220°F, suitable for indoor/outdoor use.
The 3M™ Dual Lock™ Reclosable Fastener SJ3441 is an innovative fastening solution featuring black interlocking mushroom-shaped heads with 400 stem density per square inch. This industrial-grade fastener provides strong, reliable, and durable fastening that can be opened and closed multiple times, making it an excellent alternative to traditional screws, nuts, and bolts. The non-adhesive back allows for easy attachment using hot melt, epoxy, or liquid adhesives, providing design flexibility and simplifying assembly processes.
Designed for industrial and occupational use, this reclosable fastener delivers exceptional performance with an audible snap that verifies secure closure. The product features good temperature resistance up to 220°F (104°C) and is suitable for both indoor and outdoor applications. With a closure life of 1000 cycles, the fastener maintains its strength throughout multiple attachments and detachments, offering hundreds of reattachments without performance degradation. The mushroom heads easily slide over each other, allowing for positioning before being snapped together, creating a durable attachment with fast product assembly.
This fastener is engineered to mate with Type 170 or Type 250 stem densities, providing different strength combinations to customize for specific project requirements. The lightweight alternative to metal fasteners remains hidden beneath surfaces without interfering with material integrity, providing aesthetic improvements and design flexibility. Ideal for construction, electronics, furniture, medical devices, military applications, packaging, and transportation industries.
Key Features
- Black interlocking mushroom-shaped heads with 400 stem density per square inch for strong, reliable fastening
- Reclosable design allows opening and closing multiple times with 1000 cycle closure life
- Non-adhesive back compatible with hot melt, epoxy, and liquid adhesives for flexible attachment
- Audible snap verification ensures secure closure and provides confirmation of proper engagement
- Temperature resistant up to 220°F (104°C) with good performance in indoor and outdoor applications
- Compatible with Type 170 and Type 250 stem densities for customizable strength combinations
- Lightweight alternative to metal fasteners providing aesthetic improvements and design flexibility
- Durable construction maintains strength throughout multiple attachments and detachments
Technical Specifications
| Specification |
Value |
| Part Number | SJ3441 |
| Product Form | Roll |
| Overall Width (Imperial) | 6 inches |
| Overall Width (Metric) | 152.4 millimeters |
| Overall Length (Imperial) | 50 yards |
| Overall Length (Metric) | 45.72 meters |
| Product Color | Black |
| Adhesive Type | Non-adhesive |
| Backing Material | Polyolefin |
| Stem Density | 400 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 |
| Temperature Resistance | 220°F (104°C) |
| Closure Life | 1000 cycles |
| Flame Retardant | No |
| Units per Case | 1 Roll |
| Smallest Saleable Unit | Roll |
| Brand | 3M Dual Lock™ |
| 3M Product Number | SJ3441 |
| 3M ID | 7000124121 |
| UPC | 00048011579139 |
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