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3M™ Dual Lock™ Reclosable Fastener SJ3872 170 Black, 3/4 in x 45 yd 0.22 in (5.6 mm) 2 per case Bulk

3M ID  70006716552    UPC#  00051111974292    3M Product Number  SJ3872     
3M™ Dual Lock™ Reclosable Fastener
3M™ Dual Lock™ Reclosable Fastener
3M™ SJ3870
3M(TM) Dual Lock(TM) SJ4580 Stem Close Up
3M Dual Lock Reclosable Fastener 170 Stems Per Inch Black
The 3M™ Dual Lock™ Reclosable Fastener TB3560 has a clear acrylic adhesive on the back of a clear polypropylene reclosable fastener. This product can be used both indoors and outside in a variety of applications; and has a slim 0.23 inch engaged thickness and long service life.
  • Reclosable system is up to five times stronger in tensile strength than hook-and-loop fasteners
  • Snap-in-place installation replaces screws, nails, snaps and rivets
  • Clear hidden fastener provides a clean, smooth appearance
  • Clear acrylic adhesive bonds to metals, glass and high surface energy plastics
  • Type 250 stem density polyolefin fastener mates to type 170, 250 or 400, increasing fastening options
  • Ideal for indoor and outdoor use to attach doors, access panels, signs, cushions, headliners and display components
  • High temperature resistance – up to 220°F (104 °C)
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Our remarkable 3M™ Dual Lock™ Reclosable Fastener SJ3872 can be opened and closed up to 1,000 times before losing 50% of the original strength for repeated access or repositioning. 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 and leave you with an unbroken surface to help create a smooth, clean appearance. The Type 170 stem density polyolefin fastener mates to Type 250 or 400 (SJ3870 or SJ3871) giving the user the option of different closure strength depending upon application.


  • General industrial
  • Transportation
  • Specialty vehicle
  • Medical
  • 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.

3M™ Dual Lock™ Reclosable Fastener SJ3872
Unique mushroom-shaped heads snap shut and stay locked
Hear the Snap
"Snap!" It's the one word that best defines our extensive line of 3M™ Dual Lock™ Reclosable Fastener products. Here's how it works: 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.

Lose the Screws
The bond is strong but can easily be detached; just pull apart to disengage and reattach as needed. This means that our 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 — 3M™ Dual Lock™ Reclosable Fastener is an aesthetically pleasing product that doesn't sacrifice attachment strength; in fact, the 3M™ Dual Lock™ Reclosable Fastener SJ3872 is about five times stronger in tensile strength than typical Hook and Loop Fasteners. 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 our innovative fasteners a popular and effective solution.


 Adhesive Type‎‎ Modified Acrylic Adhesive
 Brand‎‎ Dual Lock
 Closure Life‎‎ 1000
 Color‎‎ Black
 Consumer Label‎‎ No
 Engaged Thickness‎‎ 0.24 Inch
 Flame Retardant‎‎ No
 Indoor/Outdoor‎‎ Both
 Industries‎‎ Transportation,‎ Specialty Vehicle,‎ Construction,‎ Furniture,‎ Medical,‎ Military & Government,‎ General Industrial,‎ Retail,‎ MRO,‎ Electronics,‎ Packaging
 Length‎‎ 45 Linear Yard
 Length (Metric)‎‎ 41.14 m
 Low Profile‎‎ No
 Maximum Operating Temperature (Celsius)‎‎ 82 Degree Celsius
 Maximum Operating Temperature (Fahrenheit)‎‎ 180 Degree Fahrenheit
 Primary Liner‎‎ Red Polyethylene
 Product Form‎‎ Roll
 Stem Density‎‎ 170
 Width‎‎ 0.75 Inch
 Width (Metric)‎‎ 19.05 mm