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SKU 7000052206
Legacy SKU 70070968345
UPC 00021200561009
Product Number SJ3220

3M™ Dual Lock™ Reclosable Fastener SJ3220 is a square reclosable fastener with a single disk base for insertion into a key hole slot. The surface is lined with polyolefin mushroom stems of density 400, and can be paired with other stem densities for varying levels of interlocking strength. Stems provide superior strength over hook and loop closures yet easily peel apart for internal access.

  • Interlocking mushroom-shaped stems snap together to form a strong, fast and easy attachment
  • Secures with an audible snap for closure verification
  • Resistant to high temperature and solvents, ideal for automotive applications
  • Strong holding power reduces the rattling and vibration of components
  • Does not require any special tools or processing equipment
  • Single disk base inserts into a key hole slot for 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 November 21  


Minimum Order 1,000 Items
Order Increment 1,000 Items
  Multiple Application Use
  Easy To Use
  Fantastic Price
Product Dimensions
Imperial Metric
Shipping Dimensions
Weight 4.15 lb
Length 9.812 in
Width 9.812 in
Height 10 in
Color Black


  1. What is the 3M™ Dual Lock™ Reclosable Fastener SJ3220?

    The 3M™ Dual Lock™ Reclosable Fastener SJ3220 is a black, stem density 400 reclosable fastener that can be used in many applications.

  2. What size and quantity does the product come in?

    The Pop-in Piece Part of 3M™ Dual Lock™ Reclosable Fastener SJ3220 comes with a diameter of 0.23 inches and you will get approximately1000 pieces per case when you purchase it bulk.

  3. Where can I use this product?

    Due to its versatility, this product can be widely used on both indoor and outdoor surfaces where there are temperature changes or vibration such as cars, televisions among others.

  4. How sticky is this product?

    : This reclosable fastening system has an acrylic adhesive that forms a strong bond immediately after application.

  5. : Can I recycle the packaging after using these products?

    : Yes! our distribution focuses profoundly on sustainability implementation so keep in mind all 3M packages are made from recyclables materials therefore feel free to recycle them once done.

Product Description

Convenient Assembly and Re-Assembly for Automotive Trim
Ideal for attaching automotive trim components, 3M™ Dual Lock™ Reclosable Fastener SJ3220 provides a high-strength closure that is easy to assemble and just as easy to open and reclose in high cycle applications. Moreover, the pieces audibly snap together with a satisfying click to form a secure, dependable and repeatable attachment.

Designed with hundreds of interlocking mushroom-shaped stems, this polypropelene fastener can replace conventional attachments such as screws or adhesives, which can be time-consuming to fit and assemble, may weaken the part, or are susceptible to vibration and weather extremes. Dual Lock fasteners are constructed with polyolefin stems and holds tight regardless of high heat, cold, moisture or humidity. These fasteners are also an excellent attachment solution when vibration is an issue – not only does the fastener hold tight, but it actually reduces vibration and rattling of components.

Additional Features include:

  • Fast assembly with no drilling or additional tools required
  • Hidden attachment avoids unsightly mechanical fasteners on the show surface
  • High temperature and solvent resistance
  • Mushroom heads that allow flexibility in alignment for easy attachment of components
  • Can be used to attach components before they enter the final assembly plant, thus helping to reduce the number of parts and the length of assembly time
  • Combinations of stem densities and the engaged area provide adjustable and proportional engagement and disengagement forces
  • An audible snap confirms that the part is correctly installed with minimal insertion force required by the assembly worker

How It Works
This pop-in fastener is designed to be popped into a key hole slot where attachment is desired. Its polypropylene disk base grips the inside of the hole and holds tight. The fastener can be snapped to a second Dual Lock fastener attached to another part – forming a secure, dependable and repeatable attachment.

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 fasteners can be used to attach components before they enter the final assembly plant, thus helping to reduce the number of parts and the length of assembly time.

Stem Densities
3M™ Dual Lock™ Reclosable Fasteners allow customers to combine different stem densities and engaged areas to create adjustable and proportional engagement and disengagement forces to suit their application. Dual Lock fasteners are offered in three different densities (stems per square inch): 170, 250, and 400. Dual Lock fastener SJ3220 has 400 stems per square inch, offering the tightest hold, and can be mated to Type 170 or 250. It should not be mated with another Type 400 fastener because the hold would be so tight that detachment would likely result in damage to the parts.

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. Some examples of applications include:

  • Headliners
  • Trunk liners
  • Door panels
  • Toll transponders
  • Vehicle headliners
  • Sunroofs
  • Interior lighting
  • Window and door trim
  • Vibration and sound dampening control
  • CHMSL – Center Height Mount Stop Lamp – cover plates
  • Center console flanges

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 ultraviolet radiation, high moisture levels and wide temperature ranges. For applications that require a key hole slot pop-in piece and multiple closures, look no further than the long-lasting durability of 3M™ Dual Lock™ Reclosable Fastener SJ3220. It is yet another outstanding example of how 3M technologies advance operations in the automotive industry, providing both ease of use and superior results.