Industrial-grade reclosable fastener with interlocking mushroom heads, 250 stem density, providing 5X stronger tensile strength than hook-and-loop products. Reusable, audible snap closure, bonds to metals and plastics, temperature resistant to 140°F.
The 3M™ Dual Lock™ Reclosable Fastener SJ3870 is a premium industrial fastening solution designed as a convenient alternative to traditional fastening methods such as screws, nuts, and bolts. Featuring black interlocking mushroom-shaped heads with 250 stem density per square inch, this fastener delivers exceptional strength—up to 5X the tensile strength of typical hook-and-loop products. The product consists of a black, modified acrylic, highly conformable foam tape protected by a removable film liner, offering superior bonding to a wide variety of substrates including metals, powder-coated paints, and plastics such as acrylics, polycarbonate, and ABS.
This reclosable fastening system can be opened and closed multiple times without losing its strength, making it ideal for applications requiring frequent access or repositioning. The fastener produces an audible snap when secure, verifying closure of the attachment, and can be disengaged by simply peeling the pieces apart by hand. With excellent temperature resistance up to 140°F (60°C) and chemical and UV resistance, the 3M™ Dual Lock™ Reclosable Fastener SJ3870 is well-suited for both indoor and outdoor applications. The product comes in a convenient roll format with 4 rolls per case, each measuring 1/2 inch wide by 45 yards long, providing ample material for industrial assembly, access panels, graphic attachment, and general industrial attachment applications.
Designed for quick installation without the need for drilling, screwing, or sewing tools, this fastener offers significant design flexibility and aesthetic improvements. The interlocking mushroom-shaped heads easily slide over each other, allowing for positioning of parts before being snapped together. Additionally, this fastener is compatible with Type 170, Type 250, and Type 400 stem densities, enabling customization for different strength requirements and system performance needs.
Key Features
- Interlocking mushroom-shaped heads with 250 stem density per square inch for superior strength
- Up to 5X tensile strength compared to typical hook-and-loop fastening products
- Reusable and reclosable fastener maintains strength through hundreds of attachments and detachments
- Audible snap verification when secure, peels apart easily by hand for disengagement
- Modified acrylic conformable foam tape bonds to metals, powder-coated paints, and plastics
- Temperature resistant up to 140°F (60°C) with chemical and UV resistance
- No drilling, screwing, or sewing tools required for quick and easy installation
- Compatible with Type 170, Type 250, and Type 400 stem densities for customized strength
- Black color with removable film liner for clean application
- Suitable for both indoor and outdoor industrial applications
Technical Specifications
| Specification |
Value |
| Product Number | SJ3870 |
| UPC Code | 00051111187913 |
| 3M ID | 7000049435 |
| Product Color | Black |
| Product Form | Roll |
| Overall Width (Imperial) | 0.5 in |
| Overall Width (Metric) | 12.7 mm |
| Overall Length (Imperial) | 45 yd |
| Overall Length (Metric) | 41.14 m |
| Engaged Thickness (Imperial) | 242 mil |
| Engaged Thickness (Metric) | 6.1 mm |
| Primary Liner Thickness (Imperial) | 5 mil |
| Primary Liner Thickness (Metric) | 0.13 mm |
| Stem Density | 250 per square inch |
| Adhesive Type | Modified Acrylic |
| Maximum Operating Temperature (Fahrenheit) | 180°F |
| Maximum Operating Temperature (Celsius) | 82°C |
| Closure Life | 1000 cycles |
| Units per Case | 4 rolls |
| Smallest Saleable Unit | Roll |
| Flame Retardant | No |
| Indoor/Outdoor | Indoor/Outdoor |
| Brand | Dual Lock™ |
| Compatible Stem Densities | Type 170, Type 250, Type 400 |
| Chemical Resistance | Yes |
| UV Resistance | Yes |
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