3M™ Dual Lock™ Reclosable Fastener SJ3550

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Black, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times

Mates with Type 170, Type 250 or Type 400 stem densities to provide different strength combinations

White, acrylic, conformable foam tape bonds well to a variety of substrates including metals and plastics such as acrylics, polycarbonate and ABS

Overall Width (Imperial)

Overall Width (Metric)

Adhesive Type

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Details

Highlights

Black, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times
Mates with Type 170, Type 250 or Type 400 stem densities to provide different strength combinations
White, acrylic, conformable foam tape bonds well to a variety of substrates including metals and plastics such as acrylics, polycarbonate and ABS
Strong fastener secures with an audible snap, verifying closure
An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance
Features good temperature resistance of 200°F (93°C)
Best suited for indoor and outdoor use

Unlock simplicity, super strength and ultimate ease. The remarkable 3M™ Dual Lock Reclosable Fastener can be opened and closed up to 1,000 times before losing 50% of its original strength, for repeated access or repositioning. The mushroom heads easily slide over each other allowing 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 for a smooth, clean appearance.

Unlock Simplicity
Durable and secure, 3M™ Dual Lock™ Reclosable Fastener SJ3550 has exceptional strength through its interlocking mushroom-shaped heads (250 stem density per square inch), providing up to 5X the tensile strength of typical hook-and-loop products. We designed this fastener with a white, acrylic, conformable foam tape protected by a removable, film liner. This solid, pressure sensitive foam tape features a strong, durable bond that is heat, chemical and UV resistant. With 3M™ Dual Lock™ Reclosable Fastener SJ3550, there is no need for any drilling, screwing or sewing tools which makes for quick installation.

Durable and secure, 3M™ Dual Lock™ Reclosable Fastener SJ3550 has exceptional strength through its interlocking mushroom-shaped heads (250 stem density per square inch), providing up to 5X the tensile strength of typical hook-and-loop products

3M™ Dual Lock™ Reclosable Fasteners are available in three stem densities to customize for the strength requirements of your project

Recommended Applications:

Access panels
Graphic attachment
Specialty vehicles (interior attachments)
General industrial attachment
Small components

Design Flexibility
3M™ Dual Lock™ Reclosable Fastener SJ3550 consists of interlocking mushroom-shaped heads that easily slide over each other, allowing for positioning of parts before being snapped together. This fastening process creates a durable attachment and provides fast product assembly with great design flexibility. Our reclosable fasteners can also engage with different stem densities for varying levels of strength and system performance.

3M™ Dual Lock™ Reclosable Fasteners sound an audible snap when secure, which verifies closure of the attachment. To disengage, simply peel the pieces apart by hand. Our fasteners maintain their strength throughout multiple attachments and detachments. A lightweight alternative to metal fasteners, this product remains hidden beneath surfaces and does not interfere with the integrity of your material—providing aesthetic improvements and design flexibility.

Hundreds of Reattachments in a Snap
When two pieces of 3M™ Dual Lock™ Reclosable Fasteners mate, the stems flex and the mushroom heads slide past each other. After passing the opposing mating piece, the stems snap back into their original position and the opposing mushroom heads interlock. These fasteners can provide high tensile strength but can be opened by simply cleaving or peeling open the closure. This product is well suited for many indoor and outdoor applications where a high strength and versatile reclosable fastening system is required.

Delivers Long-Lasting Performance
Not all design requirements are easily satisfied, but you can simplify your attachments. When you need a strong, reliable, yet removable closure, 3M™ Dual Lock™ Reclosable Fasteners are the easy alternative to traditional fastening methods such as screws, nuts or bolts.

Typical properties

Details

Adhesive Color	White
Adhesive Type	General Purpose Acrylic Adhesive, Acrylic
Application	Trim & Molding Attachment, Interior Mirror & Fixture Attachment, Wall & Door Panel Attachment, Sunroof Trim Attachment, Wall Headliner Attachment, Wall Panel Attachment, Attaching City Bus light fixtures, Privacy Curtain Rail Attaching, Ceiling Attachment, Fastening Headliner & Ceiling Systems, Wiring Harness Attachment, Panel Attachment Systems, Mounting Boat Accessories, Guitar Pedal Board Assembly, Mounting Surveillance Cameras, Wood Blinds Trim Attachment, Attaching Graphics, Kiosk Assembly, Dashboard Attachment, Sensor Attachment, Drone Accessory Attachment, Mounting RV Accessories, Power Strip Attachment, Point of Sales System Attachment
Backing (Carrier) Material	Polypropylene
Brands	Dual Lock™
Closure Life	1000
Engaged Thickness (Imperial)	0.23 in
Engaged Thickness (Metric)	5.8 mm
Flame Retardant	No
Indoor/Outdoor	Indoor/Outdoor
Industries	Construction, Furniture, Medical, MRO, Retail, General Industrial, Military & Government, Packaging, Specialty Vehicle, Automotive, Electronics, Transportation, Marine, Appliance
Maximum Operating Temperature (Celsius)	93 ℃
Maximum Operating Temperature (Fahrenheit)	200 ℉
Primary Liner	Clear Polyolefin
Primary Liner Color	Transparent
Primary Liner Thickness (Imperial)	4 mil
Primary Liner Thickness (Metric)	0.1 mm
Product Color	Black
Product Form	Roll
Smallest Saleable Unit	Roll
Solution for	Wireless Network: Infrastructure Accessories
Stem Density	250
Units per Case	1.0, 2.0, 4.0

Dimensions and Classifications

Overall Length (Imperial)	50 yd
Overall Length (Metric)	45.72 m
Overall Width (Imperial)	0.5 in, 0.75 in, 1 in, 1.5 in, 2 in, 6 in
Overall Width (Metric)	12.7 mm, 19.05 mm, 25.4 mm, 38.1 mm, 50.8 mm, 152.4 mm

Resources

3M™ Dual Lock™ Reclosable Fastener SJ3550

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	Current product 3M™ Dual Lock™ Reclosable Fastener SJ3550	3M™ Dual Lock™ Reclosable Fastener SJ3561	3M™ Dual Lock™ Reclosable Fastener SJ3540	3M™ Dual Lock™ Reclosable Fastener SJ3441
Overall Width (Metric)	12.7 mm, 19.05 mm, 25.4 mm, 38.1 mm, 50.8 mm, 152.4 mm
Product Form	Roll
Overall Width (Imperial)	0.5 in, 0.75 in, 1 in, 1.5 in, 2 in, 6 in
Backing (Carrier) Material	Polypropylene
Product Color	Black
Adhesive Type	General Purpose Acrylic Adhesive, Acrylic

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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.