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3M™ Dual Lock™ Reclosable Fastener SJ3731, Pop-In Piece Part, Stem Density 400, Black, 20 mm x 20 mm

3M™ Dual Lock™ Reclosable Fastener SJ3731
3M™ Dual Lock™ Reclosable Fastener SJ3731
3M™ Dual Lock™ Reclosable Fastener SJ3731 is a black, polypropylene reclosable fastener with a pop-in square top, a single disk base and a stem density of 400 stems per square inch.
  • Mushroom heads allow flexibility in alignment for easy attachment of components.
  • Can be opened and re-closed in high cycle applications.
  • Provides hidden component attachment, preventing disruption on the show surface.
  • Strong holding power reduces the rattling and vibration of components.
  • Does not require any special tools or processing equipment.
  • Can be used to attach components before they enter the final assembly plant, thus helping to reduce the number of parts and the length of assembly time.
  • Combinations of stem densities and the engaged area provide adjustable and proportional engagement and disengagement forces.
  • Audibly snaps together to form a secure, dependable and repeatable attachment.
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Key Attributes

3M™ Dual Lock™ Reclosable Fasteners Pop-In Parts attach without the use of pressure sensitive adhesive, and come with a variety of bases that can be inserted into holes of precise dimension. They are easy to install and require no special equipment or skills.


Engaged Thickness Range (metric)8.86 to 9.42 Millimetre
Hole TypeKey Hole Slot
Insertion ForceLow
Manufacturing SegmentInterior, Exterior
Panel Thickness Range2.5 to 2.8 Millimetre
Piece Parts TypePop-In
Post Length5 Millimetre
Product FormPiece
Pull Out Force91 - 93 Pound
Stem Area20 x 20 Millimetre
Stem ColorBlack
Stem Density400