Professional-grade reclosable fastener with interlocking mushroom heads, 250 stem density, 1/2 inch x 50 yard roll, 4 rolls per case, up to 1,000 reattachments, suitable for industrial applications.
The 3M™ Dual Lock™ Reclosable Fastener SJ3550 is a professional-grade fastening solution featuring black interlocking mushroom-shaped heads with 250 stem density per square inch. This innovative fastener provides exceptional strength through its unique design, delivering up to 5X the tensile strength of typical hook-and-loop products. The fastener can be opened and closed up to 1,000 times before losing 50% of its original strength, making it ideal for applications requiring repeated access or repositioning. The white acrylic conformable foam tape bonds securely to a variety of substrates including metals and plastics such as acrylics, polycarbonate, and ABS.
Designed for industrial and occupational use, the SJ3550 comes in rolls measuring 1/2 inch wide by 50 yards long, with 4 rolls per case. The mushroom heads easily slide over each other, allowing precise positioning of parts before being snapped together to create a firm fastening attachment. This reclosable fastener is protected by a removable film liner and features a solid, pressure-sensitive foam tape that is heat, chemical, and UV resistant. With a maximum operating temperature of 200°F (93°C), this fastener is well-suited for both indoor and outdoor applications.
The SJ3550 offers an excellent alternative to traditional fastening methods such as screws, nuts, or bolts. Installation requires no drilling, screwing, or sewing tools, ensuring quick and efficient assembly. When mated, the fasteners remain hidden from view, providing an unbroken surface for a smooth, clean aesthetic appearance. The fastener produces an audible snap when secure, verifying proper closure. It mates with Type 170, Type 250, or Type 400 stem densities to provide different strength combinations based on specific project requirements.
Key Features
- Black interlocking mushroom-shaped heads with 250 stem density per square inch for strong, reliable fastening
- Can be opened and closed up to 1,000 times before losing 50% of original strength
- Up to 5X the tensile strength of typical hook-and-loop products
- White acrylic conformable foam tape with heat, chemical, and UV resistance
- Audible snap verification when secure, with simple hand-peel disengagement
- Compatible with Type 170, Type 250, and Type 400 stem densities for custom strength combinations
- Maximum operating temperature of 200°F (93°C) for indoor and outdoor use
- Quick tool-free installation without drilling, screwing, or sewing
- Hidden fastener provides smooth aesthetic appearance with unbroken surface
- Comes in convenient 1/2 inch x 50 yard rolls, 4 rolls per case
Technical Specifications
| Specification |
Value |
| Product Number | SJ3550 |
| Overall Width (Imperial) | 0.5 inches |
| Overall Width (Metric) | 12.7 millimeters |
| Overall Length (Imperial) | 50 yards |
| Overall Length (Metric) | 45.72 meters |
| Product Form | Roll |
| Product Color | Black |
| Adhesive Color | Black |
| Stem Density | 250 stems per square inch |
| Engaged Thickness (Imperial) | 0.23 inches |
| Engaged Thickness (Metric) | 5.8 millimeters |
| Maximum Operating Temperature (Fahrenheit) | 200°F |
| Maximum Operating Temperature (Celsius) | 93°C |
| Backing Material | Polyolefin |
| Primary Liner | Clear Polyolefin |
| Primary Liner Color | Transparent |
| Primary Liner Thickness (Imperial) | 4 mils |
| Primary Liner Thickness (Metric) | 0.1 millimeters |
| Closure Life | 1,000 cycles |
| Units per Case | 4 rolls |
| Smallest Saleable Unit | Roll |
| Flame Retardant | No |
| Indoor/Outdoor | Indoor/Outdoor |
| Brand | 3M Dual Lock |
| UPC Code | 00021200658150 |
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