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Multisert from Tappex Thread Inserts Ltd

Multisert

The Tappex Multisert range of inserts for plastics has been developed to be a multi-purpose insert for various environments and application criteria. It includes four primary designs – Unheaded, Headed 1t & 1tr (single thickness head at standard & reduced diameters), Headed 2t & 2tr (double thickness head at standard & reduced diameters) and Microbarb.


Unheaded – Product Features

The most significant feature of the Mulitisert is its Barb Form that makes the insert suitable for different installation methods. The designer can therefore increase pull-out performance using the same insert by changing from press-fitting cold to heat or ultrasonic insertion.

Plain top ring gives a good bearing surface for mating components and traps any molten plastic forced upwards during insertion providing a clean flush fit (correct hole size must be used).

Free running internal thread – the insert is set in the plastic independently from the expansion action of the mating screw. This prevents rotation or screw breakage during assembly.

External Barb form gives good flow characteristics and high pull-out performance.

Plain location spigot and pilot barb ensures that the insert locates squarely in the drilled or moulded hole prior to assembly.


Unheaded – Design Aids

  • It should be specified for press-in applications in flexible thermoplastics, installation can be at the moulding machine to make use of operator time
  • It can be installed into most thermoplastics by heat or ultrasonics to give higher resistance to pull out loads

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