3M™ Dual Lock™ SJ4570 Reclosable Fastener

3M™ Dual Lock™ Reclosable Fastener SJ4570: High-performance removable fastening

The 3M™ Dual Lock™ Reclosable Fastener SJ4570 provides a high-performance removable fastening solution capable of supporting significant loads while remaining repositionable.

Its interlocking mushroom-shaped stem system creates a firm and reliable hold, without the need for aggressive adhesives or special tools.

Ideal for demanding industrial environments, it is resistant to vibration, humidity, and temperature fluctuations.

A must-have for any application requiring repeatedly detachable fastening on rigid surfaces.

What is the 3M™ Dual Lock™ Reclosable Fastener SJ4570?

The 3M™ Dual Lock™ Reclosable Fastener SJ4570 is a removable fastening system based on polypropylene mushroom stems. It snaps onto itself, or any other compatible Dual Lock™ tape, without the need for separate male/female components.

It is the industrial alternative to classic hook-and-loop: stronger, cleaner, and more reusable. The SJ4570 is designed for demanding applications where the fastener must hold over time while remaining detachable.

Dual Lock™ technology: How do the mushroom stems work?

Each side of the tape is covered with mushroom-shaped stems. When two surfaces face each other and are pressed together, the heads of the stems interlock mechanically with an audible snap. No hooks, no loops: just a rigid bond between two identical geometries.

The SJ4570 features a density of 400 stems/in², providing high shear strength. The assembly withstands repeated opening/closing cycles without significant loss of performance.

The back of the tape is equipped with a high-performance pressure-sensitive acrylic adhesive. It bonds directly to most smooth surfaces: metal, plastic, glass, and composites.

Here is how the SJ4570 compares to other Dual Lock™ references:

Reference	Stem density	Shear strength	Typical usage
SJ4570	400 stems/in²	High	Industrial fastening, panels, equipment
SJ3550	250 stems/in²	Medium	Displays, light signage
SJ3560	400 stems/in²	High	Similar applications, adhesive-free
Industrial Hook & Loop (other manufacturer)	N/A (hook/loop)	Medium to high	General purpose, textiles, light fastening

Technical characteristics and typical properties of the SJ4570

The 3M™ Dual Lock™ SJ4570 is a reclosable fastener designed to replace screws, rivets, and mechanical fasteners in many industrial applications.

Its operating principle is based on the mechanical interlocking of polypropylene mushroom stems. Two strips of SJ4570 snap together face-to-face with an audible click, ensuring a firm and repeatable bond.

The stem density is 400 stems/in², placing it in the high-performance range of the Dual Lock series. This density offers superior peel and shear strength compared to lower-density tapes.

The adhesive backing is a high-performance acrylic, compatible with many substrates: metal, ABS plastic, polycarbonate, and composites. It is resistant to vibrations and moderate thermal stress.

Typical properties of the SJ4570 include:

• Stem material: Black polypropylene
• Density: 400 stems/in²
• Adhesive: High-performance acrylic
• Service temperature: -40°C to +70°C
• Shear strength: High (repeatable fastening for up to several hundred cycles)
• Total thickness: approximately 3.3 mm (stems + adhesive)

Product	Density (stems/in²)	Adhesive	Max temperature	Typical usage
3M™ Dual Lock™ SJ4570	400	HP Acrylic	+70°C	Industry, electronics, panels
3M™ Dual Lock™ SJ3550	250	Standard Acrylic	+60°C	General purpose, light loads
3M™ Dual Lock™ SJ3560	400	Standard Acrylic	+60°C	Light to moderate assembly
Industrial Hook & Loop	-	Variable	+60°C	Textile fastening, common usage

Unlike classic hook-and-loop, the Dual Lock SJ4570 does not use hooks and loops: both sides are identical and snap into each other, which simplifies inventory management.

Comparison: SJ4570 vs. other Dual Lock™ references and removable fastening systems

The SJ4570 is not the only Dual Lock™ reference in the 3M catalog. Here is how it compares to other available options.

Comparison table of major 3M Dual Lock™ references

Reference	Stem density (stems/cm²)	Engagement force	Backing	Typical usage
SJ4570	170 stems/cm²	High	Acrylic foam	Irregular surfaces, robust fastening
SJ3550	170 stems/cm²	High	Polyester	Rigid flat surfaces
SJ3560	400 stems/cm²	Very high	Polyester	Intensive industrial assembly
SJ4560	400 stems/cm²	Very high	Acrylic foam	Curved or textured surfaces
Industrial Hook & Loop	-	Moderate	Variable	Light fastening, textiles

The SJ4570 stands out due to its acrylic foam backing. It compensates for surface micro-irregularities, whereas a polyester backing like the SJ3550 requires a perfectly flat surface.

Compared to the SJ4560 (400 stems/cm²), the SJ4570 offers a lower engagement force. The result is easier assembly/disassembly, ideal when frequent access is required.

Compared to industrial hook-and-loop, the Dual Lock™ SJ4570 does not wear out from fiber snagging. Its rigid stem structure ensures repeated cycles without significant loss of performance.

In summary, the SJ4570 is the right choice when you have:

• Irregular or slightly curved application surfaces
• A need for regular disassembly
• Environments subject to vibrations or moderate impacts

Applications and fields of use for the Dual Lock™ SJ4570 fastener

The Dual Lock™ SJ4570 fastener adapts to a wide range of situations where a removable, clean, and resistant fastening is needed. It effectively replaces screws, rivets, or permanent adhesives in many industrial and commercial contexts.

Its interlocking stem design allows it to support significant loads while remaining detachable by hand. This is a major advantage for any assembly requiring regular maintenance.

Here are the main areas of application:

• Electronics and IT: securing cases, cables, control modules
• Automotive: holding interior panels, trims, onboard screens
• Displays and signage: mounting and quick replacement of signs, POS materials, advertisements
• Industry: assembly of machine guards, hoods, access covers
• Medical: securing lightweight equipment on carts or mobile stands
• Interior design: laying carpets, mats, removable wall coverings

The SJ4570 is particularly valued in environments subject to vibrations or repeated mechanical stress. It maintains its cohesion where classic textile hook-and-loop would quickly fail.

At Dagobert Industrie, we observe strong demand for this tape in the embedded electronics and temporary signage sectors, two areas where the reversibility of the fastener is a non-negotiable requirement.

Installation tips and best practices for optimal fastening

The Dual Lock™ SJ4570 offers excellent performance, but careful installation makes all the difference. Here are the key points to follow.

Prepare the surface first. Clean both surfaces with isopropanol or an appropriate cleaner. Any trace of grease, dust, or moisture compromises the adhesion of the backing.

Let it dry completely before applying the tape. A drying time of 1 to 2 minutes is sufficient in most cases.

Apply firm and uniform pressure along the entire length of the tape during installation. Use a roller or your thumb with successive passes. This activates the acrylic adhesive and ensures maximum contact.

Allow for a curing time of 24 to 72 hours before putting stress on the fastener. The adhesive reaches its full strength gradually after application.

For reliable stem engagement, press both sides against each other with moderate pressure. A characteristic click confirms the bond. To disassemble, peel from one side, never by pulling straight apart.

• Minimum recommended surface area: 6 cm² per fastening point
• Ideal installation temperature: between 15°C and 38°C
• To be avoided: porous surfaces, non-stick paints, unprepared flexible plastics
• Opening/closing cycles: up to 1,000 cycles without significant loss of performance

Whether indoors or outdoors, the SJ4570 holds up over time as long as these simple steps are followed.

FAQ - 3M™ Dual Lock™ Reclosable Fastener SJ4570

1. What is the difference between Dual Lock™ SJ4570 and classic hook-and-loop?

The Dual Lock™ SJ4570 works with rigid polypropylene mushroom stems, not textile hooks and loops.

Result: significantly higher fastening strength than standard hook-and-loop, with symmetrical interlocking, both sides are identical.

It also resists repeated opening and closing cycles much better.

2. Is the SJ4570 suitable for curved or irregular surfaces?

Its acrylic adhesive backing allows for good adhesion on flat and slightly curved surfaces.

For very irregular or porous surfaces, surface preparation remains essential: careful degreasing with a primer or 3M cleaner before application.

3. How much weight can the SJ4570 tape support?

The SJ4570 develops high shear strength, typically around 350 stems/cm², making it suitable for light to medium fastening.

It is not designed for heavy loads in direct tension. For higher requirements, the Dual Lock™ SJ3560 (higher density) may be more appropriate.

4. Can the SJ4570 be used outdoors?

The SJ4570 tolerates moderate exposure to humidity and UV, but it is not designed for prolonged immersion or permanent outdoor exposure.

For intensive outdoor applications, 3M offers specific versions with reinforced adhesive.

5. How many opening/closing cycles can the SJ4570 withstand?

The Dual Lock™ SJ4570 is designed for approximately 1,000 engagement/disengagement cycles without significant loss of performance.

This is a major advantage over permanent adhesive solutions or textile hook-and-loop that wear out quickly.

6. Which materials does the SJ4570 adhere to properly?

The acrylic adhesive works well on smooth surfaces: metal, ABS plastic, polycarbonate, glass, and composite panels.

It adheres less well to low surface energy materials like raw polypropylene or polyethylene, a 3M primer is recommended in these cases.