High-strength reclosable fastener with interlocking mushroom heads, 250 stem density, 1.5in x 50yd roll, rated for 1,000 reattachments, ideal for access panels and industrial applications
The 3M™ Dual Lock™ Reclosable Fastener SJ3550 is a revolutionary mushroom-shaped fastening system designed for industrial and occupational applications. With 250 stem density per square inch, this black fastener delivers exceptional strength and reliability, providing up to 5X the tensile strength of typical hook-and-loop products. The interlocking mushroom-shaped heads allow for repeated opening and closing up to 1,000 times before losing 50% of original strength, making it ideal for applications requiring frequent access or repositioning.
This fastening solution features a white, acrylic, conformable foam tape with a removable film liner, providing excellent adhesion to a variety of substrates including metals and plastics such as acrylics, polycarbonate, and ABS. The product is engineered with pressure-sensitive adhesive that is heat, chemical, and UV resistant, ensuring durability in both indoor and outdoor environments. The fastener operates at temperatures up to 200°F (93°C) and produces an audible snap when securely engaged, providing positive verification of closure.
The 3M™ Dual Lock™ Reclosable Fastener SJ3550 comes in rolls measuring 1.5 inches wide by 50 yards long, with 2 rolls per case. It serves as an excellent alternative to traditional fastening methods such as screws, nuts, and bolts, eliminating the need for drilling, screwing, or sewing tools. This innovative fastener is compatible with Type 170, Type 250, and Type 400 stem densities, allowing customization of strength combinations for various project requirements. Recommended applications include access panels, graphic attachment, specialty vehicle interior attachments, general industrial attachment, and small component fastening.
Key Features
- Black interlocking mushroom-shaped heads with 250 stem density per square inch for maximum strength
- Can be opened and closed up to 1,000 times before losing 50% of original strength
- Provides up to 5X the tensile strength of typical hook-and-loop fastening products
- White acrylic conformable foam tape bonds well to metals and plastics including acrylics, polycarbonate, and ABS
- Produces audible snap when securely engaged for positive closure verification
- Temperature resistant up to 200°F (93°C) with heat, chemical, and UV resistance
- Compatible with Type 170, Type 250, and Type 400 stem densities for customized strength combinations
- No drilling, screwing, or sewing required for quick and easy installation
- Hidden fastener design provides smooth aesthetic appearance with unbroken surface finish
- Suitable for both indoor and outdoor applications
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Dual Lock™ Reclosable Fastener SJ3550 |
| Part Number | SJ3550 |
| 3M Product Number | SJ3550 |
| 3M ID | 7000052214 |
| UPC | 00021200563461 |
| Product Form | Roll |
| Overall Width (Imperial) | 1.5 in |
| Overall Width (Metric) | 38.1 mm |
| Overall Length (Imperial) | 50 yd |
| Overall Length (Metric) | 45.72 m |
| Engaged Thickness (Imperial) | 0.23 in |
| Engaged Thickness (Metric) | 5.8 mm |
| Product Color | Black |
| Backing Material | Polypropylene |
| Backing (Carrier) Material | Polypropylene |
| Adhesive Color | Black |
| Stem Density | 250 stems per square inch |
| Closure Life | 1,000 cycles |
| Maximum Operating Temperature (Fahrenheit) | 200°F |
| Maximum Operating Temperature (Celsius) | 93°C |
| Primary Liner | Clear Polyolefin |
| Primary Liner Color | Transparent |
| Primary Liner Thickness (Imperial) | 4 mil |
| Primary Liner Thickness (Metric) | 0.1 mm |
| Flame Retardant | No |
| Indoor/Outdoor | Indoor/Outdoor |
| Units per Case | 2 rolls |
| Smallest Saleable Unit | Roll |
| Tensile Strength | 5X stronger than typical hook-and-loop products |
| Compatible Types | Type 170, Type 250, Type 400 stem densities |
| Application | Interior Mirror & Fixture Attachment, Trim & Molding Attachment, Wall & Door Panel Attachment |
| Brand | Dual Lock™ |
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