Professional-grade 3M Dual Lock reclosable fastener with interlocking mushroom heads for strong, reusable bonding. Black foam tape with modified acrylic adhesive bonds to metals, paints, and plastics. 2 in x 45 yd roll with 250 stem density per square inch.
The 3M™ Dual Lock™ Reclosable Fastener SJ3870 is a professional-grade adhesive fastening solution designed as a convenient alternative to traditional fastening methods such as screws, nuts, and bolts. Featuring interlocking mushroom-shaped heads with 250 stem density per square inch, this black foam tape delivers exceptional strength with up to 5X the tensile strength of typical hook-and-loop products. The fastener is constructed with a black, modified acrylic, highly conformable foam tape that bonds securely to a variety of substrates including metals, powder-coated paints, and plastics such as acrylics, polycarbonate, and ABS.
This 45-yard roll comes with a removable film liner and is engineered for quick, tool-free installation without the need for drilling, screwing, or sewing. The product features an audible snap when secure, providing verification of closure, and can be opened and closed multiple times—maintaining strength throughout hundreds of reattachments. The fastener is chemical and UV resistant, making it suitable for both indoor and outdoor applications. With a maximum operating temperature of 180°F (82°C), it delivers long-lasting performance for access panels, graphic attachment, general industrial attachment, and small component fastening.
Designed for industrial and occupational use, the 3M™ Dual Lock™ Reclosable Fastener SJ3870 provides design flexibility, aesthetic improvements, and a lightweight alternative to metal fasteners that remains hidden beneath surfaces. The product mates with Type 170, Type 250, or Type 400 stem densities to provide different strength combinations based on specific project requirements.
Key Features
- Interlocking mushroom-shaped heads with 250 stem density per square inch for exceptional strength
- Up to 5X the tensile strength of typical hook-and-loop products
- Can be opened and closed multiple times with hundreds of reattachments without losing strength
- Audible snap when secure provides verification of closure
- Modified acrylic foam tape bonds to metals, powder-coated paints, and plastics including acrylics, polycarbonate, and ABS
- Chemical and UV resistant for durability
- Maximum operating temperature of 180°F (82°C)
- Tool-free installation without drilling, screwing, or sewing
- Mates with Type 170, Type 250, or Type 400 stem densities for customizable strength
- Suitable for both indoor and outdoor applications
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Dual Lock™ Reclosable Fastener SJ3870 |
| Part Number | SJ3870 |
| UPC Code | 00051111187951 |
| Product Color | Black |
| Overall Width (Imperial) | 2 in |
| Overall Width (Metric) | 50.8 mm |
| Overall Length (Imperial) | 45 yd |
| Overall Length (Metric) | 41.14 m |
| Product Form | Roll |
| Adhesive Type | Modified Acrylic |
| Stem Density | 250 per square inch |
| Engaged Thickness (Imperial) | 242 mil |
| Engaged Thickness (Metric) | 6.1 mm |
| Primary Liner Thickness (Imperial) | 5 mil |
| Primary Liner Thickness (Metric) | 0.13 mm |
| Maximum Operating Temperature (Fahrenheit) | 180°F |
| Maximum Operating Temperature (Celsius) | 82°C |
| Closure Life | 1000 cycles |
| Flame Retardant | No |
| Indoor/Outdoor | Indoor/Outdoor |
| Units per Case | 1 Roll |
| Smallest Saleable Unit | Roll |
| Compatible Stem Densities | Type 170, Type 250, Type 400 |
| Compatible Substrates | Metals, Powder-coated paints, Plastics (Acrylics, Polycarbonate, ABS) |
| Brand | 3M Dual Lock™ |
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