3M™ Dual Lock™ Reclosable Fastener SJ3736, Slide-in Piece Part, Black, Stem Density 170, 25.4 mm x 170.31 mm

The 3M™ Dual Lock™ Reclosable Fastener SJ3736 represents an advanced fastening solution engineered from black polypropylene material. This innovative product features a square, slide-in base design coupled with a stem density of 170 stems per square inch, delivering reliable performance for demanding automotive applications. By eliminating many of the traditional challenges associated with conventional screw-based fastening and concealed fastener systems, this reclosable fastener enables straightforward installation without requiring specialized tools or equipment, making it an ideal choice for manufacturers seeking to streamline assembly processes.

The 3M™ Dual Lock™ Reclosable Fasteners represent a specialized category of positive-locking, blind fastening technology specifically engineered for automotive trim component attachment. These fasteners utilize distinctive mushroom-shaped polyolefin stems that mechanically interlock when pressed together, creating a robust and secure high-tensile closure. Primary applications include the attachment of rigid and semi-rigid materials such as automotive trim panels, door components, instrument panel bezels, interior headliners, and various decorative and functional trim elements found on both the interior and exterior of vehicles. Unlike many traditional fastening systems, these fasteners operate independently of pressure-sensitive adhesives and instead employ a mechanical slide-in base system that accommodates precision-engineered dimensional specifications.

The fastening mechanism operates by inserting the fastener into a channel of matching width at the desired attachment location. The polypropylene base component grips securely against the interior channel surfaces, establishing a stable foundation. When a second Dual Lock fastener—affixed to trim or another component—is brought into contact with the first fastener, the two units mate together to create a firm, permanent connection between the attached parts.

During the mating process, the flexible polypropylene stems compress and allow the distinctive mushroom-shaped heads to slide past one another. Once the opposing components have passed completely, the stems automatically return to their original configuration, causing the mushroom heads to interlock securely with one another. While these fasteners deliver impressive tensile strength capabilities, they maintain the practical advantage of easy disassembly—the closure can be opened simply by cleaving or carefully peeling apart the fastened joint. This combination of strength and serviceability eliminates alignment complications and completely eliminates any requirement for specialized installation equipment, enabling components to be securely attached before reaching the final assembly facility and thereby reducing overall parts inventory and production time.

The engagement and disengagement forces required for various applications can be precisely calibrated through strategic combinations of stem density levels and engaged surface area. The 3M™ Dual Lock™ fastener product line encompasses three distinct stem density options measured in stems per square inch: 170, 250, and 400. The SJ3736 model specifically features a stem density of 170 stems per square inch, equivalent to measurements of 25 millimeters.

The 3M™ Dual Lock™ Reclosable Fastener system functions as a versatile replacement for conventional mechanical fastening methods across numerous assembly and attachment scenarios where reclosability, serviceability, or component accessibility represents an important design requirement. These fasteners excel in automotive applications involving the secure attachment of rigid and semi-rigid structural elements. Specific use cases include:

The 3M™ Dual Lock™ Reclosable Fastener system represents an optimal solution for applications demanding both exceptional tensile strength and reliable reclosable fastening capabilities. Through the integration of advanced physics principles and sophisticated materials science methodologies, 3M engineers have developed a fastening technology that delivers consistent performance across challenging environmental conditions. These fasteners maintain their