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3M™ Dual Lock™ reclosable fasteners

3M™ Dual Lock™ reclosable fasteners

3M Dual Lock is a unique reclosable fastener with a VHB clear acrylic adhesive tape for mounting. It features strong, interlocking mushroom-shaped heads that slide past each other and snap with high closure strength, but then can be reopened, making it perfect for attaching access panels, architectural panels, various vehicle components, portable devices like highway transponders or mobile cameras, as well as panels for signs, exhibits and displays. These 3M snap fasteners make an audible click when attached, giving the installer or assembly worker the confidence to know that the part has been securely attached.

Halco’s value to customers who use Dual Lock in their assembly process is our knowledge, expertise and converting capability. We have many years experience converting Dual Lock and know how to cut 3M Dual Lock tape into more usable strips, circles and die-cut shapes that fit our customer’s product design, manufacturing process and deliver the closure strength they need per square inch. In this way, we help our customers improve their quality and productivity when using 3M Dual Lock as an attachment system.


  • Transport
  • Industrial
  • Display & Graphics


  • White
  • Black
  • Transparent
A roller being used to snap together 3M dual lock reclosable fastener with a close up of interlocking mushroom-shaped heads.

Dual Lock Features

  • Interlocking mushroom-shaped heads have five times the tensile strength of hook and loop products
  • Durable — open and close up to 1,000 times before losing 50% of original tensile strength
  • Temperature, moisture and UV resistant
  • Different stem densities are available to create different closure strengths.
  • Dual Lock products using a 250 stem density are self mating. Dual pairing a 250:170 stem density have lesser closure strength while a 250:400 pairing has high closure strength
  • VHB pressure-sensitive adhesive easily forms a powerful bond
  • Easy to apply and maintain, easy to clean out dust or debris
  • Helps reduce vibration
  • Low profile Dual Lock option is approximately half the thickness of standard 3M™ Dual Lock Reclosable Fastener

Dual Lock Die Cutting & Converting

Halco is an expert at Dual Lock die-cutting and can cut specific shapes very efficiently to match your design. We’ve learned how to effectively convert Dual Lock reclosable fasteners without damaging their interlocking mushroom heads and can convert both mated and unmated pieces, including both strips and coins.


Custom die cut 3M dual lock fastener.


Product FamilyAdhesive TypeSubstratesType 170Type 250Type 400
SJ3540 (Black)Rubber-basedIndoor Use with:
Aluminum, Stainless Steel, Acrylic, PC, ABS, Powder Coated Paints, Polypropylene
SJ3550 (Black)Conformable AcrylicIndoor/Outdoor Use with:
Aluminum, Stainless Steel, Glass, Acrylic, PC, ABS
SJ3560 (Clear)Firm AcrylicIndoor/Outdoor Use with:
Aluminum, Stainless Steel, Glass, Acrylic, PC, ABS
SJ3870 (Black)Conformable Modified AcrylicIndoor/Outdoor Use with:
Aluminum, Stainless Steel, Acrylic, PC, ABS, Powder Coated Paints
For thinner applications, see our 3M Dual Lock low profile reclosable fasteners including: SJ4570 (clear, indoor use)SJ4575 (black) and SJ4580 (clear, indoor/outdoor use).

selecting the right dual lock stem density

One of the many benefits of Dual Lock is that it is self-engaging and makes an audible snap with it is engaged or disengaged. The Dual Lock products that end in zero have a wavy stem pattern that has a stem count of 250 stems per inch. These products mate to themselves and work for the vast majority of customer applications in most industries.

There are times, however, when a customer might want a different level of force for fastener engagement or disengagement. For these situations, 3M offers other Dual Lock products that have a lower stem density (170 stems per square inch) or a higher density (400 stems per square inch). These products are almost always mated to a 250 stem count product and are never mated to themselves. Provided below is a table that shows you the engagement and disengagement force of these different combinations.

Stem Density CombinationEngagement Force (Tensile)Disengagement Force (Tensile)
170 to 25013 lbs/sq in27 lbs/sq in
250 to 25022 lbs/sq in43 lbs/sq in
250 to 40031 lbs/sq in60 lbs/sq in
Low Profile Dual Lock to Itself27 lbs/sq in
Tensile strength of different Dual Lock stem density combinations


Interior Panel Attachments

– Passenger rail cars
– Buses
– Ambulances
– Marine vessels
– Elevators

Removable Access Panels

– Water and natural gas valves
– Electrical junctions
– Elevator control boxes
– Recessed lighting

Mobile Mounting

– Windshields
– Vehicle dashboards
– Electronics, sensors or trackers
– Motorcycle or RV accessories

Signage and Display

– Free-standing signage
– Kiosk assembly
– Point-of-sale system attachment
– Placards or retail price tags


Industry Standards and Certifications

  • REACH & RoHS Compliant

Request Full Product Specification Sheet >