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SKU 7000126079
Legacy SKU 70070485464
UPC 00021200646997
Product Number SJ3443

3M™ Dual Lock™ Reclosable Fastener SJ3443 is the easy and clear alternative to traditional fastening methods, such as screws, nuts or bolts. It is designed to deliver a durable, reclosable fastening solution, which can be opened and closed multiple times. This fastener is most commonly attached by applying hot melt, epoxy or liquid adhesive.

  • Black, interlocking mushroom-shaped heads (400 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times
  • Mates with Type 170 or Type 250 stem densities to provide different strength combinations
  • Non-woven backing allows for attachment with hot melt, epoxy or liquid adhesives
  • Strong fastener secures with an audible snap, verifying closure
  • An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance
  • Features good temperature resistance of 220°F (104°C), though temperature resistance may change based on adhesive used
  • Suited for indoor or outdoor use
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On it's way to you January 25  


Minimum Order 4 Rolls
Order Increment 4 Rolls
  Multiple Application Use
  Easy To Use
  Fantastic Price
Product Dimensions
Imperial Metric
Width 1 in 25.4 mm
Length 50 yd 45.72 m
Shipping Dimensions
Weight 11.5 lb
Length 21 in
Width 21 in
Height 2.8 in
Color Black


  1. What is 3M™ Dual Lock™ Reclosable Fastener SJ3443?

    3M™ Dual Lock™ Reclosable Fastener SJ3443 is a black, interlocking mushroom-shaped fastener with an adhesive backing that provides strong attachment for a variety of applications.

  2. What size is the 3M™ Dual Lock™ Reclosable Fastener SJ3443?

    The product comes in rolls that are one inch wide by 50 yards long and there are two rolls per case.

  3. Which industries use this type of reclosable fastener?

    This versatile product can be used in a wide range of industries such as electronics, automotive, aerospace, and healthcare.

  4. Is the Type 400 version easy to remove and reposition ?

    Yes, thanks to its reusability. It possesses high tensile strength which makes it suitable for bonding many different types of substrates. When you pull apart this high-strength tape, you would have hear an audible snap verifying closure

  5. . Can it withstand extreme temperatures or UV exposure?

    . The reclosable fasteners are rated to handle between -40°F (-40°C) up until up to +200°F (+93°C). They’re also resistant against UV light abuse making them ideal under diverse atmospheres like outdoor use h frequencies

For industrial/occupational use only. Not for consumer sale or use.
3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.
Unlock Simplicity

Durable and secure, 3M™ Dual Lock™ Reclosable Fastener SJ3443 has exceptional strength through its interlocking mushroom-shaped heads (400 stem density per square inch), providing up to 5X the tensile strength of typical hook-and-loop products. With 3M™ Dual Lock™ Reclosable Fastener SJ3443, there is no need for any drilling or screwing.

Recommended Applications:
  • Alternative to pressure sensitive adhesives
Design Flexibility

3M™ Dual Lock™ Reclosable Fastener SJ3443 consists of interlocking mushroom-shaped heads that easily slide over each other, allowing for positioning of parts before being snapped together. This fastening process creates a durable attachment and provides fast product assembly with great design flexibility. 3M reclosable fasteners can also engage with different stem densities for varying levels of strength and system performance.

Available in Convenient Mini Packs

3M™ Dual Lock™ Reclosable Fasteners sound an audible snap when secure, which verifies closure of the attachment. To disengage, simply peel the pieces apart by hand. 3M fasteners maintain their strength throughout multiple attachments and detachments. A lightweight alternative to metal fasteners, this product remains hidden beneath surfaces and does not interfere with the integrity of your material—providing aesthetic improvements and design flexibility.

Hundreds of Reattachments in a Snap

When two pieces of 3M™ Dual Lock™ Reclosable Fasteners mate, 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. This product is well suited for many indoor applications where a good performance, high strength, reclosable fastening system is required.

Delivers Long-Lasting Performance

Not all design requirements are easily satisfied, but you can simplify your attachments. When you need a strong, reliable, yet removable closure, 3M™ Dual Lock™ Reclosable Fasteners are the easy alternative to traditional fastening methods such as screws, nuts or bolts.

Brochures, Catalogs & Data Sheets
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Lead times are estimates and may vary based on our suppliers' product availability.