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SKU 7000049438
Legacy SKU 70006651148
UPC 00051111187975
Catalog Number SJ3871
Product Number SJ3871

The 3M Dual Lock Reclosable Fastener SJ3871 has a modified acrylic adhesive on the back of a black polypropylene reclosable fastener. This product can be used both indoors and outside in a variety of applications; and has a slim 0.24 engaged thickness and long service life.

  • Reclosable system is up to five times stronger than hook-and-loop fasteners
  • Snap-in-place installation replaces screws, nails, snaps and rivets
  • Black fastener is hidden when closed, providing a clean, smooth appearance
  • Modified acrylic adhesive bonds to many plastics, powder coated paints and medium to low surface energy materials with little or no surface preparation
  • Type 400 stem density polyolefin fastener mates to type 170 or 250
  • Ideal for indoor and outdoor use to attach doors, flexible solar panels, headliners, access panels, signs and display components
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On it's way to you May 24  


Minimum Order 2 Rolls
Order Increment 2 Rolls
  Multiple Application Use
  Easy To Use
  Fantastic Price
Product Dimensions
Imperial Metric
Length 45 yd 41.14 m
Shipping Dimensions
Weight 10.00017 lb
Length 20.98425 in
Width 20.98425 in
Height 2.79528 in
Color Black


  1. What is 3M™ Dual Lock™ Reclosable Fastener SJ3871 used for?

    The 3M™ Dual Lock™ Reclosable Fastener SJ3871, Black, Type 400 is a versatile fastening solution that can be used in various applications such as securing carpets or floor mats, attaching signs, posters and banners.

  2. How strong is the adhesive on this product?

    The strength of the adhesive depends on many factors including surface type and roughness. However, you can expect it to have superior holding power compared to traditional hook-and-loop fasteners due to its mushroom shaped stem provide more engagement with the opposing half of the closure.

  3. Can I reuse this fastener tape?

    Yes! Because it's a reclosable fastener tape design that allows for easy disengagement and reattachment—the peel bonds alternatively engages/disengages multiple times before losing its ability to stick securely.

  4. Is it heat-resistant/suitable for outdoor use?

    : Definitely! This product has high temperature performance (up to +200°F) ensuring suitability for indoor/outdoor use. It also resists moisture as well because IP67 rated when combined with specific types of substrates making it ideal even exposed direct sunlight or inclement weather situations.

  5. Q:Is there anything else important I should know about this product?

    A:The neat thing about 3M's products line is each one comes from science. When inventing our new adhesives we investigated all aspects systematically so employers & hobbyists like yourself could benefit from both short-term & long-term solutions that save time/money - thanks part mental effort invested by our focus groups/testing lab experts during production process -- both leading edge technology yet affordable too

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.
The 3M™ Dual Lock™ Reclosable Fastener SJ3871

The 3M™ Dual Lock™ Reclosable Fastener SJ3871 is a remarkable product that can be opened and closed up to 1,000 times before losing 50% of its original strength. The mushroom heads easily slide over each other, allowing for positioning of parts before they are snapped together to create a firm fastening attachment. When mated, the fasteners are hidden from view, leaving you with an unbroken surface to help create a smooth, clean appearance. The type 400 stem density polyolefin fastener mates to type 170 or 250, giving the user the option of different closure strength depending upon application.

Recommended Applications
  • General industrial
  • Transportation
  • Specialty vehicle
  • Medical
  • Military
  • Packaging
  • Point of purchase displays
  • Exhibits
  • Electronics
  • Construction
  • Furniture
  • Maintenance repair and operations (MRO)

This fastener is backed by a modified acrylic adhesive that bonds to many plastics (polyethylene, acrylic, polycarbonate, and ABS), powder-coated paints, and medium to low surface energy materials with little or no surface preparation.

"Snap!" It's the one word that best defines the extensive line of 3M™ Dual Lock™ Reclosable Fastener products. When two pieces of 3M Dual Lock Reclosable Fastener are pressed together, the stems flex, and the mushroom heads slide past each other. After passing the mushroom heads on the opposing mating piece, a stem snaps up into its original position, interlocking with the opposing heads. Listen for the audible snap to signal that the fastener is engaged. The attachment formed may be as effective as screws or rivets, but will peel apart for repositioning. 3M Dual Lock Reclosable Fasteners are used extensively in transportation, electronics, business equipment, machinery, medical, and sign and display markets.

The bond is strong but can easily be detached; just pull apart to disengage and reattach as needed. This means that this product gives you a strong, hidden closure with the convenience of multiple openings and closings so you can lose the screws, rivets, hooks, bolts, zippers, and other unsightly attachment methods. In short – this product is an aesthetically pleasing fastener that doesn't sacrifice attachment strength. In fact, the 3M™ Dual Lock™ Reclosable Fastener SJ3871 is about five times stronger in tensile strength than 3M Hook and Loop fasteners used in comparable applications. In many cases, this attachment method also saves the user money with less material used. Additionally, there's no need to drill holes that might weaken the part or substrate, and no tools required to assemble or remove the part.

You expect more options to secure, attach, and connect surfaces. 3M Dual Lock Reclosable Fasteners offer quick installation and high-strength attachment, yet can be opened as easily as zippers. That functional flexibility, as well as superior aesthetics, reduced weight, and savings in labor and installation costs, make innovative 3M fasteners a popular and effective solution.

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