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Black polypropylene tape with mushroom-shaped stems, acrylic adhesive backing, 10 ft roll

3M

3M Dual Lock Type 400 Reclosable Fastener Black Acrylic Adhesive SJ3551

SKU CH-JYRE-4MNPX

Black reclosable fastener with 400 stems per square inch and acrylic adhesive bonds to metal, glass and high-energy plastics for removable panels and displays

  • TypeAdhesive Tapes
  • ColorBlack
  • Reclosable up to 1,000 cycles with 400 stems per square inch
  • Five times stronger closure than hook-and-loop fasteners
  • Bonds metal, glass and high-energy plastics without tools
  • Mates with type 170, 250 or 400 counterparts for flexible strength
  • General-purpose acrylic adhesive on polypropylene carrier for durable hold

3M Dual Lock SJ3551 Reclosable Fastener

This 3M Dual Lock SJ3551 is a black reclosable fastener featuring 400 stems per square inch on a polypropylene carrier with acrylic adhesive. It is designed for makers and technicians who need a strong, reusable attachment method that allows for repeated access or repositioning of panels, signs, or components. The fastener engages with a thickness of .23 inches and offers a closure life of 1000 cycles, providing 5X the closure strength of standard hook-and-loop alternatives.

Compatible Stem Densities and Substrates

Type 400 fasteners mate with type 170, 250, or 400 counterparts, with combined stem density determining the final closure strength. The acrylic adhesive bonds effectively to metals, glass, and medium-to-high surface energy plastics and paints, replacing screws, rivets, or snaps in many applications. It will not adhere reliably to low surface energy materials such as polyethylene or polypropylene substrates without additional surface preparation.

Installation Notes and Common Issues

The roll measures 3/4 in. by 10 ft. and applies by pressing the adhesive side onto a clean, dry surface; no tools are required. Ensure both mating faces are Type 400, 250, or 170 to achieve a secure lock. A frequent problem is premature adhesive failure caused by installing on dusty, oily, or low-energy surfaces without proper cleaning or priming.

Highlights

  • Reclosable up to 1,000 cycles with 400 stems per square inch
  • Five times stronger closure than hook-and-loop fasteners
  • Bonds metal, glass and high-energy plastics without tools
  • Mates with type 170, 250 or 400 counterparts for flexible strength
  • General-purpose acrylic adhesive on polypropylene carrier for durable hold

Specifications

TypeAdhesive Tapes
ColorBlack

Questions about this item

Should I choose Type 400 or a lower stem density like 170 or 250 for my application?

Type 400 provides 400 stems per square inch and mates with 170, 250, or 400; the higher the combined stem count, the stronger the closure, so select based on the holding power you need.

What does the 0.23 inch engaged thickness mean when the fastener is closed?

When two pieces interlock, the total bonded stack measures 0.23 inches thick, so allow that gap in your panel or door design.

Does the acrylic adhesive on the polypropylene carrier bond to low-energy plastics?

The adhesive is designed for metals, glass, and medium-to-high surface energy plastics and paint; it is not recommended for low-energy plastics such as polyethylene or polypropylene substrates.

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