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SKU 7100017244
Legacy SKU 75347238588
UPC 00051115550850
Product Number SJ3240

3M™ Dual Lock™ Reclosable Fastener SJ3240 is a black, polypropylene reclosable fastener with a 20 mm x 20 mm, rectangular base that slides into a channel of precise dimension. It is lined with polyolefin mushroom stems of density 250 per 25mm², and can be paired with other stem densities for varying levels of strength. Stems offer more strength than hook and loop closures yet easily peel apart.

  • Interlocking mushroom-shaped stems snap together to form a strong, fast and easy attachment
  • Provides hidden component attachment, preventing disruption on the show surface
  • Strong holding power reduces the rattling and vibration of components
  • Resistant to high temperatures and solvents
  • Does not require any special tools or processing equipment for installation
  • Audibly snaps together for a secure, dependable and repeatable attachment
  • Mates with other stem densities to achieve a variety of engagement and disengagement forces
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On it's way to you October 31  


Minimum Order 5,000 Items
Order Increment 5,000 Items
  Multiple Application Use
  Easy To Use
  Fantastic Price
Product Dimensions
Imperial Metric
Width 0.787 in 20 mm
Shipping Dimensions
Weight 13 lb
Length 15.375 in
Width 11.25 in
Height 11.5 in
Color Black


  1. What type of surface does the 3M™ Dual Lock™ SJ3240 fastener adhere to?

    The SJ3240 fastener is designed to bond well with various surfaces, including metals, glass and high-energy plastics.

  2. Can I easily remove and reuse this product?

    Yes absolutely! The 3M™ Dual Lock™ SJ3240 reclosable fastener can be opened and closed multiple times without losing its holding strength.

  3. Do you have other color options or sizes available for this product?

    Yes we do! We offer a range of sizes and colors in this specific dual lock tape series, please let us know your requirements.

  4. How strong is this product? Is it appropriate for industrial purposes?

    Absolutely - these are quite popular among industries as they provide both strength & durability!

  5. . Can you help me with installation instructions if required?

    . Of course we would be more than happy to support you with that - These are extremely easy to install but just incase you need assistance our team will assist promptly.

Designed to Hold
3M™ Dual Lock™ Reclosable Fastener SJ3240 is a black, polypropylene reclosable fastener with a 20 mm x 20 mm, slide-in with extended sides and has a stem density of 250 stems per square inch. This product overcomes the often difficult alignment and installation problems of screws and hidden fasteners, offering simple installation with no additional tools required. 3M™ Dual Lock™ Reclosable Fasteners are positive-locking, blind fasteners designed for attaching automotive trim components. The products feature mushroom-shaped polyolefin stems that snap together, forming a high tensile closure.

These fasteners attach without the use of pressure sensitive adhesive, and come with extended sides that can slide into a formed or molded bracket for easy installation. They are easy to install and require no special equipment or skills.

How It Works
When two pieces of 3M™ Dual Lock™ Reclosable Fasteners are pressed together, the stems flex and the mushroom heads slide past each other. After passing the opposing mating piece, the stems snap back into their original position and the opposing mushroom heads interlock. These fasteners can provide high tensile strength but can be opened by simply cleaving or peeling open the closure.

Alignment and re-alignment are easy and no special tools are required. This means that the Dual Lock fastener can be used to attach components before they enter the final assembly plant, helping to reduce the number of parts and assembly time.

Stem Densities
Combinations of stem densities and the engaged area provide adjustable and proportional engagement and disengagement force to meet application requirements. Dual Lock fasteners are offered in three different densities (stems per square inch): 170, 250, and 400. The Dual Lock fastener SJ3240 has 250 stems per square inch (25mm), offering the tightest hold, and can be mated to Type 170, 250 or 400.

Recommended Applications
3M™ Dual Lock™ Reclosable Fasteners can replace conventional mechanical fasteners in a wide range of assembly and attachment applications where reclosability or serviceability is desired. Dual Lock fasteners are used primarily to secure rigid and semi-rigid surfaces such as trim or door panels, instrument panel bezels, headliners, and other automotive interior and exterior trim. Other application examples include attaching accessories and equipment, window and door trim panels, sunroof rings and vibration and sound damping control.

3M Science Delivers Closures You Can Count On
3M™ Dual Lock™ Reclosable Fasteners are ideal for many applications where a high strength, reclosable fastening system is required. 3M engineers have uniquely combined physics and materials science to bring the automotive industry reliable fasteners that supply high performance even after exposure to high moisture levels and wide temperature ranges. For applications that require a slide-in piece and multiple closures, look no further than the long-lasting durability of the 3M™ Dual Lock™ Reclosable Fastener SJ3240 Slide-In Piece Part. It is yet another outstanding example of how 3M technologies advance operations in the automotive industry, providing both ease of use and superior results.