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Small Joint Assemblies

3M Small Joint Assembly 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 these 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 to help resist stress.

  • 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

  • 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.​​​

  • Peel and Shear Stress of Overlap Joints

     


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Performance Factors for Small Joint Assemblies

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

  • + = Good ++ = Better +++ = Best

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