SJ3252

SJ3252 Datasheet


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3 Dual LockTM Reclosable Fasteners for Transportation Industry

Selection Guide

Product Information

March, 2004

General Description Benefits
3M Dual Lock Reclosable Fasteners are positive-locking, blind fasteners designed for attaching headliner, wall and door panels in the transportation industry. The products feature mushroom-shaped polyolefin stems that snap together, forming a high tensile closure. Dual Lock reclosable fasteners are used primarily to secure rigid and semi-rigid surfaces. Some examples are to prevent headliner sag, attach center consoles, instrument panel bezels, headliners, wall and door panels and other interior trim.

Dual Lock reclosable fasteners overcome the often difficult alignment and installation problems of screws and hidden fasteners. Dual Lock reclosable fasteners offer a cost effective alternative to traditional fasteners.

Easy Alignment Dual Lock reclosable fasteners engage in any orientation. The heads slide over each other until they are engaged with firm pressure, eliminating concerns about misalignment, premature or incomplete engagement.

Reclosability Dual Lock reclosable fasteners can be opened and reclosed in high cycle life applications.

Rattle-Free Dual Lock reclosable fasteners typically won’t rattle loose.

Blind Attachment Dual Lock reclosable fasteners can be attached on the backside of a trim piece where it won’t interrupt the show surface.

Ease of Assembly Dual Lock reclosable fasteners can be attached to components before they enter the assembly plant, reducing the number of parts and the required assembly time.

Multiple Attachment Methods Dual Lock reclosable fasteners can be attached to a variety of surfaces by A adhesive attachment with hot melt or pressure-sensitive adhesives, B mechanical attachment using rigid back parts, C high strength popin parts, D sewing, E stapling, or F ultrasonic fusing. Custom mold-in parts for low temperature/low pressure mold applications are also available.

Positive Locking Dual Lock reclosable fasteners fasten with an audible snap, assuring secure closure.
3M Dual Lock Reclosable Fasteners for Transportation Industry

Selection Guide
3M Dual Lock Reclosable Fasteners are available in three stem densities:

Type 170 Type 250 Type 400 Low Profile
170 stems/sq in approximately 26 stems/sq cm 250 stems/sq in approximately 39 stems/sq cm 400 stems/sq in approximately 62 stems/sq cm 705 stems/sq in approximately 110 stems/sq cm

Dual Lock Reclosable Fasteners can be mated in the following combinations:
170 to 250

Easy opening for multiple closures. low engagement force, low tensile strength.
250 to 250 170 to 400

Medium engagement force balanced with moderate tensile strength.
250 to 400

Higher engagement force balanced with high tensile strength.

Dual Lock to 3M Scotchmate Loop Quick grab engagement giving high peel force.

Low Profile

One half the thickness of Dual Lock, easier to engage, flexible.

Trunk liners v

Headliners v

Door panels v

CHMSL Covers

Trim panels Instrument panel bezels v
3M Dual Lock Reclosable Fasteners for Transportation Industry

Selection Guide

Attachment Options
3M Dual Lock Reclosable Fasteners Plain Back/Pressure-Sensitive/Non-Woven Backed

All available in 50 yard rolls except as noted, up to 4 in. mm wide. Plain Back Dual Lock reclosable fasteners can be attached to surfaces by sewing, stapling, ultrasonically fusing to many polypropylene materials or use of liquid adhesives which bond polypropylene. Pressure-Sensitive Dual Lock reclosable fasteners utilize 3M High Performance Acrylic Foam Tapes, which adhere to most automotive surfaces such as painted steel, aluminum, stainless steel and ABS. On some surfaces, primers may be required. Non-Woven Backed Dual Lock reclosable fasteners utilizes a polyolefin non-woven loop backing to facilitate attachment with hot melt or liquid adhesives to substrates. Recommended combinations, listed in order of increasing strength 170 to 250, 170 to 400, 250 to 250, 705 to 705, 250 to 400, Dual Lock to 3M Scotchmate loop. Note Type 170 to 170 and Type 400 to 400 are not recommended combinations.

Approx. stems/cm2

Engaged Thicknessa mils mm
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Datasheet ID: SJ3252 519999