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SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment
SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment

SJ3550 Black Die Cut Waterproof Dual Lock Reclosable Fastener Type 250 for Ceiling & Bag Sealing Attachment

Product Name 3M™ Dual Lock™ Reclosable Fastener SJ3550
Color Black (fastener), Clear/White (adhesive)
Fastener Type Interlocking mushroom-shaped stems (Type 250)
Stem Density 250 stems/in² (38.75 stems/cm²)
Base/Backing Material Black polyolefin
Adhesive Type Acrylic foam pressure-sensitive adhesive
Engaged Thickness 5.7 mm (0.22 in)
Total Thickness Approx. 5.7 mm
Closure Cycle Life > 1,000 cycles (50% strength retention)
Maximum Operating Temperature 93 °C (200 °F) (long-term); 149 °C (300 °F) (short-term)
Key Features High tensile strength, audible snap, reusability, UV & chemical resistant
Compatible Substrates Metals, glass, ABS, acrylic, polycarbonate, medium/high surface energy plastics
Standard Sizes 12.7 mm, 25.4 mm, 50.8 mm x 45.7 m rolls

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Reclosable FastenerIndustrial FastenerAutomotive FastenerDual Lock3m Sj3550Mushroom Head Tape
Product Description
Product Overview
3M™ Dual Lock™ SJ3550 is a heavy-duty, reclosable fastening solution, serving as a reliable alternative to screws, bolts, and rivets. Featuring a black polyolefin base with 250 interlocking mushroom-shaped stems per square inch (Type 250), it bonds securely via a clear/white acrylic foam pressure-sensitive adhesive. Its interlocking design delivers up to 5 times the tensile strength of standard hook-and-loop products, ensuring robust, long-term performance
Core Features & Benefits
  • Superior Holding Power: Type 250 stem density balances strength and removability, with an audible "snap" confirming full engagement for confident installation
  • Reusable & Durable: Engineered for over 1,000 open/close cycles while maintaining 50% of original strength, ideal for frequent access needs.
  • Easy Installation: Foam adhesive conforms to textured/irregular surfaces, tool-free application for quick, clean setup
  • Versatile Bonding: Bonds strongly to metals, glass, ABS, acrylic, polycarbonate, and most medium/high surface energy plastics
  • Environmental Resistance: Resists UV, moisture, and chemicals for reliable performance in indoor/outdoor environments
  • Design Flexibility: Mates with Type 170, 250, or 400 stem densities to customize fastening strength, adapting to diverse application needs
Recommended Applications
  • Automotive: Headliners, door panels, trim, sun visors, and access panels.
  • Electronics & Equipment: Monitor mounts, sensor attachments, industrial equipment panels, and small component securing.
  • Signage & Displays: Graphic overlays, point-of-purchase displays, and decorative trim.
  • Furniture & Construction: Partition kick plates, wall panels, and modular furniture assemblies.
  • General Industrial: Mounting brackets, cable management, and camera/surveillance equipment fixation.

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