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.
Market
- Transport
- Industrial
- Display & Graphics
Colors
- White
- Black
- Transparent
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.
3M™ Dual Lock™ PRODUCT SELECTION
| Product Family | Adhesive Type | Substrates | Type 170 | Type 250 | Type 400 |
 |  |  | |||
| SJ3540 (Black) | Rubber-based | Indoor Use with: Aluminum, Stainless Steel, Acrylic, PC, ABS, Powder Coated Paints, Polypropylene | SJ3542 | SJ3540 | SJ3541 |
| SJ3550 (Black) | Conformable Acrylic | Indoor/Outdoor Use with: Aluminum, Stainless Steel, Glass, Acrylic, PC, ABS | SJ3552 | SJ3550 | SJ3551 |
| SJ3560 (Clear) | Firm Acrylic | Indoor/Outdoor Use with: Aluminum, Stainless Steel, Glass, Acrylic, PC, ABS | SJ3562 | SJ3560 | SJ3561 |
| SJ3870 (Black) | Conformable Modified Acrylic | Indoor/Outdoor Use with: Aluminum, Stainless Steel, Acrylic, PC, ABS, Powder Coated Paints | SJ3872 | SJ3870 | SJ3871 |
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 Combination | Engagement Force (Tensile) | Disengagement Force (Tensile) |
| 170 to 250 | 13 lbs/sq in | 27 lbs/sq in |
| 250 to 250 | 22 lbs/sq in | 43 lbs/sq in |
| 250 to 400 | 31 lbs/sq in | 60 lbs/sq in |
| Low Profile Dual Lock to Itself | 27 lbs/sq in |
APPLICATIONS
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
Blog Articles About Dual Lock
SEE THIS PRODUCT IN PERSON
Industry Standards and Certifications
- REACH & RoHS Compliant
- CALIFORNIA PROP 65
