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3M™ Dual Lock™ Reclosable Fastener SJ3550 250 Black, 1 in x 50 yd 0.22 in (5.6 mm), 2 per case Bulk

3M ID  70070521102    UPC#  00021200743795    3M Product Number  SJ3550     
3M™ Dual Lock™ Reclose Fastnr SJ3550 250 Black, 1inx50yd 0.22in
3M™ Dual Lock™ Reclose Fastnr SJ3550 250 Black, 1inx50yd 0.22in
3M™ Dual Lock™ Reclose Fastnr SJ3550 250 Black, 1inx50yd 0.22in
3M™ Dual Lock™ Reclosable Fastener SJ3550 solves attachment issues without the use of special tools or complicated, mechanical fastening systems. Our innovative reclosable design system allows you to attach access doors, panels, signs, display components, and many other frequently opened and closed parts for easy, repeated access with minimal loss of bonding strength over time.
  • Five times stronger in tensile than typical hook-and-loop fasteners
  • Easy peel-apart for quick access
  • Durable enough to be opened and closed 1,000 while maintaining 50% of its original strength
  • Mushroom shaped stems snap in place to ensure fastener is engaged
  • Foam tape backing allows for better contact with textured or irregular surfaces
  • General purpose acrylic adhesive bonds to metals, glass, and medium to high surface energy plastics
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Strength in Numbers
One little mushroom won't accomplish much in this world, but pair him up with a few hundred of his friends and he becomes nearly unstoppable. Teamwork, that's the idea behind the design on our 3M™ Dual Lock™ Reclosable Fastener SJ3550. When joined together, our unique, mushroom-shaped stems combine to interlock with one another, generating five times the closure strength of typical hook and loop fasteners while maintaining the ability to easily peel-apart for quick access.

Our 3M™ Dual Lock™ SJ3550 Reclosable Fastener contains approximately 250 mushroom-shaped head stems per square inch. When two pieces of Dual Lock™ are pressed together the stems flex and the mushroom heads slide past each other. After mating, the stem snaps back into its original position, interlocking with the opposing heads with an audible snaps that signals the fastener is engaged. This system can be opened and closed 1,000 times while maintaining 50% of the original tensile strength.

No Drilling, Screwing, Tightening, or Complex Installation
Our Dual Lock™ SJ3550 uses an acrylic adhesive that bonds well to a variety of high medium surface energy materials, including some plastics, metal, glass, and painted surfaces. This ensures a quick and easy installation without the use of a mechanical attachment processes. The adhesive sticks quickly and reaches full strength after 72 hours. Once bonded the interlocked, mushroom-shaped stems may hold as well as screws and rivets, yet separates easily for access.

Versatile, Durable and Invisible
There's no limit to the number of uses for our Dual Lock™ fasteners. The stems, mushroom tops, and film backing are constructed of clear polypropylene, and the polyolefin backing resist common solvents and alkaline solutions, making them ideal for a variety of purposes and environments. The fastener is recommended for use at temperatures ranging from -20°F/-29°C to 200°F/93”C. Hidden from view when attached, these fasteners provide a clean, unbroken surface, and stay strong through more than 1,000 open-close cycles.

Dual Lock™ SJ3550 fasteners feature an acrylic foam tape protected by a removable liner. This construction allows for better contact with surfaces having a slight texture or surface irregularities.

To gain various levels of holding power, this fastener can be mated with different 3M Dual Lock Reclosable Fastener types. Suggested combinations of mated fasteners are:

  • Type 250 to Type 170
  • Type 250 to Type 250
  • Type 170 to Type 400
  • Type 250 to Type 400

For a quick grab attachment with high strength, but limited cycle life any of our 3M™ Dual Lock™ products can be mated with 3M™ Hook and Loop™ Reclosable Fasteners.


 Adhesive Type‎‎ General Purpose Acrylic Adhesive
 Applications‎‎ Wall Panel Attachment,‎ Wall Headliner Attachment,‎ Attaching City Bus light fixtures,‎ Privacy Curtain Rail Attaching,‎ Ceiling Attachment,‎ Sunroof Trim Attachment
 Brand‎‎ Dual Lock
 Closure Life‎‎ 1000
 Color‎‎ Black
 Engaged Thickness‎‎ 0.23 Inch
 Flame Retardant‎‎ No
 Indoor/Outdoor‎‎ Both
 Industries‎‎ Transportation,‎ Specialty Vehicle,‎ Construction,‎ Automotive,‎ Furniture,‎ Medical,‎ Military & Government,‎ General Industrial,‎ Retail,‎ MRO,‎ Electronics,‎ Packaging
 Length‎‎ 50 Linear Yard
 Length (Metric)‎‎ 45.72 m
 Liner Thickness‎‎ 4 mil
 Liner Type‎‎ Clear Polyolefin
 Low Profile‎‎ No
 Maximum Operating Temperature (Celsius)‎‎ 93 Degree Celsius
 Maximum Operating Temperature (Fahrenheit)‎‎ 200 Degree Fahrenheit
 Product Family‎‎ Collage and assemblage
 Product Form‎‎ Roll
 Product Line‎‎ Adhesives, sealants and coatings
 Stem Density‎‎ 250
 Width‎‎ 1 Inch
 Width (Metric)‎‎ 25.4 mm