Slip Stream 24/7 – Global Supply and Distribution Company providing 3M Industrial, Commercial & Safety Solutions
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SKU 7100136225
Legacy SKU 70070521037
UPC 00021200658099
Product Number SJ3440

3M™ Dual Lock™ Reclosable Fastener SJ3440 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 black fastener is most commonly attached by applying hot melt, epoxy or liquid adhesive.

  • Black, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times
  • Mates with Type 170, Type 250 or Type 400 stem densities to provide different strength combinations
  • Non-adhesive back 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
Estimated date of shipment July 11  


Minimum Order 1 Roll
Order Increment 1 Roll
  Multiple Application Use
  Easy To Use
  Fantastic Price
Product Dimensions
Imperial Metric
Width 2 in 50.8 mm
Length 50 yd 45.72 m
Shipping Dimensions
Weight 6.2 lb
Length 21 in
Width 21 in
Height 2.8 in
Color Black


  1. What is 3M™ Dual Lock™ Reclosable Fastener SJ3440?

    3M® Dual Lock® Reclosable Fastener SJ3440 is a versatile, high-strength reclosable fastening system that allows for easy detachment and reattachment of items. It comes in rolls, pads or precut shapes ready for application.

  2. What makes the SJ3440 different from other dual lock systems?

    The SJ3440 features thousands of mushroom-shaped stems interlocking to form a secure bond, making it ideal for applications where repeated openings and closings are required.

  3. What sizes does the black SJ3440 product come in?

    Our SKU size for this product in black is 2 inches x 50 yards - we also offer various sized square/rectangular pieces designed to fit your needs

  4. . Can the SJ3440 be used indoors as well as outdoors?

    . Absolutely! With an operating temperature range of -30°F to +140°F (-34°C to +60°C), it can be used both indoors/outdoors – great resistance against UV light exposure!

  5. . Is there anything else I should know about the packaging itself?

    . This item will ship with one roll per case; we ensure speedy delivery due thanks our trusted shipping partners so you can rest assured that working together goes beyond just distributing products!

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 SJ3440 has exceptional strength through its interlocking mushroom-shaped heads (250 stem density per square inch). With 3M™ Dual Lock™ Reclosable Fastener SJ3440, there is no need for any drilling or screwing. This fastener is most commonly attached by applying hot melt, epoxy or liquid adhesive.

Recommended Applications:

Alternative to pressure sensitive adhesives

Design Flexibility
3M™ Dual Lock™ Reclosable Fastener SJ3440 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. Reclosable fasteners can also engage with different stem densities for varying levels of strength and system performance.

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. These 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.