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Small Joint Assemblies

3M Small Joint Assembly product solutions hold tight, last longer.

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Small Joint Assembly Applications

Small joints are typically irregularly shaped with only a small area available for bonding. The smaller, more irregular the joint, the greater the challenge to create a firm hold that can withstand heavy wear. Generally, they are insertion or overlap joints (or some combination of the two). They are very prominent in sporting goods, electronics, furniture, motors and electrical components.

  • Wood blocks held together by Mortise and tenon joints

    Mortise and tenon joints rely on the strength of the wood.

  • Golf club

    Shaft-hosel designs transfer the impact force of a golf club head when striking a ball.

  • 3M™ Scotch-Weld™ Threadlocker TL72 being applied to ceiling fire sprinkler

    Small joints attached with threaded mechanical fasteners provide stiff, structural assemblies.

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Common joint types and stresses in Small Joint Assemblies

  • tube-in-shaft small joint assembly

    Most small joint assemblies are 3-dimensional and are generally insertions such as mortise-and-tenon or tube-in-shaft. Because the joints are small, with forces being applied from multiple directions, the joint receives stress in nearly all forms – tension, compression, shear and cleavage. The insertion design of the joint allows the adhesive to handle the tension, compression and shear stresses while the substrates themselves help handle the cleavage.​

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Peel and Shear Stress of Overlap Joints

  • Peel and Shear Stress of Overlap Joints

    Some small joint assemblies are 2-dimensional with a majority of the stress applied as shear or peel/cleavage. Unlike panel-to-frame assemblies which have relatively long lineal lengths to disperse the load, small joint assemblies require very high strength adhesives capable of handling the stresses with very little area.​​


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Product Categories for Small Joint Assembly

  • 3M™ Scotch-Weld™ Structural Adhesives

    Acrylic, epoxy and urethane structural adhesives hold over 6.8MPa (1,000psi) in overlap shear strength. Best choice for highest strength, fatigue and environmental resistance especially for metal to metal bonds.

  • 3M™ Scotch-Weld™ Instant Adhesives

    One part solvent-free adhesive that reaches handling strength in 5–10 seconds. Best for small bondlines (<10 cm²). Commonly used on rubbers and plastics. Very tight bondlines are achievable with near instant strength.

  • 3M™ Scotch-Weld™ PUR Adhesives

    One component, hot applied thermosetting adhesive with immediate strength and holding power. Final cured strength over 6.8MPa (1,000psi). Best for wood and plastic.

  • 3M™ Scotch-Weld™ Retaining Compounds

    These unique adhesives are easy-to-dispense, cure rapidly, and provide effective torque strength while resisting temperature and vibration and sealing out moisture and gasses to protect against corrosion.

  • 3M™ Hot Melt Adhesive

    100% solid, thermoplastic resins that reach bond strength in seconds. Best for wood and plastic.


Performance Factors for Small Joint Assemblies

All 3M technologies shown below are commonly used in small joint applications. Use the list below as a relative comparison of product performance.

  • + = Good ++ = Better +++ = Best

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Need help finding the right product for your project? Contact us if you need product, technical or application advice or want to collaborate with a 3M technical specialist, or give us a call at 0330 0538936.
Need help finding the right product for your project? Contact us if you need product, technical or application advice or want to collaborate with a 3M technical specialist, or give us a call at 0330 0538936.
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