The Tappex Trisert range of inserts for plastics has been developed for various environments and application criteria. It includes three primary designs – Double ended, Reduced headed and Headed, all available as Normal limit and Close limit.
Three primary and three secondary equidistant cutting flutes over the length of the external form, give a more balanced cutting load than other forms of self-tapping insert. The cutting action takes place at a larger number of points on the thread form over the length and circumference of the insert.
Lead on both ends allows the insert to be installed either way up, therefore, where the volumes dictate that bowl feeding equipment is required, it is not necessary to incorporate complex flighting systems to orientate the insert, which makes bowl feeding simpler and reduces tooling costs.
Free running internal thread due to there being no interruption to the internal thread, as the external longitudinal flutes produce the cutting action during installation.
Reduced outward stress – During the installation process the cutting action of self-tapping inserts results in slight outward stress. This is reduced to an absolute minimum with the Trisert and enables the insert to be used in brittle materials and also where there are thin walls.
Improved axial alignment – The balanced cutting load of the Trisert reduces side thrust caused by predominantly only one cutting edge. This has the effect of guaranteeing much closer axial alignment of the insert in the hole.
The reduced headed version of the Trisert incorporates the same special truncated thread form containing three primary and three secondary equidistant cutting flutes, but provides the designer and production engineer with a higher performance flush fitting insert to match product availability to common assembly problems.
Reduced head at the same diameter as the external truncated thread form provides an increased bearing surface.
The headed version of the Trisert incorporates the same special truncated thread form containing three equidistant cutting flutes, but provides the designer and production engineer with standard options to match product availability to common assembly problems.
Large diameter head prevents jack out in applications where elongated slots or larger than standard clearance holes are necessary in the mating component. It has a larger bearing surface that is required in high torque applications.
The Tappex Trisert can be installed using our specifically designed Tappex FlexiArm, used in conjunction with our production drivers, which provides a method of accurately installing inserts at various heights and positions in a moulding. Click the videos tab to see the FlexiArm in use. Alternatively they can be installed by hand using our 031 range of Hand Installation Tools that come complete with alignment bushes to aid correct installation. Please contact our applications department for further information and details.
Material: Brass - to BS EN 12164 CW 614N
REACH/RoHS compliant as per the candidate list of substances of very high concern.
Finish: Self-Colour. Special finishes to customer requirements, at extra cost.
Description: The Trisert Double Ended is a self-tapping insert. Three length options are available as standard. Its main feature is a truncated external thread form with three equidistant main and three secondary cutting flutes.
Application: For use in most engineering plastics, Triserts give maximum performance in applications where there is a gap between the mating parts. Trisert Advanced should be specified for thin walls, hard Urea, Melamine and Phenolic materials or similar.
Hole Size: Moulded and drilled hole diameters vary dependent upon the nature of the final assembly, component geometry and plastic material. Please consult our technical department for a precise recommendation, to ensure optimum production conditions.Sizes given are for reference purposes only.
Hole Design: The hole design information is intended to indicate the approximate dimensional requirements for satisfactory installation of the insert. They should not be specified for production tooling without prior consultation with our Application Engineering Department - we accept no responsibility should the use of this information without consultation result in product failure. Please call our application engineers for assistance +44 (0) 1789 206600
Installation: Self-tapping using a hand tool (part no.031) or reversible drive mechanism. Tappex offer pneumatic reversible tools mounted in a Tappex FlexiArm, used in conjunction with a Tappex production driver (part no.029).
MANY VARIATIONS ON ALL OUR STANDARD PARTS, INCLUDING MALE INSERTS, ARE AVAILABLE. IMPERIAL THREAD SIZES USE NEAREST METRIC EQUIVALENT FOR EXTERNAL DETAIL. PLEASE CONTACT US WITH YOUR REQUIREMENTS.
|Pitch (external) P:||0.79|
|Diameter (external) B:||3.5|
|Hole Diameter C:||3.1-3.3|
|Hole Depth Y:||4.4|
|Boss Diameter X:||5.8|
|Wall Thickness W:||1.25|
The following are downloads relating to the Trisert range, although a downloads may also be applicable to other product ranges. General information can be found on our downloads page.
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The following are videos relating to the Trisert range, although a video may also be applicable to other product ranges.
Please choose a video from the list on the left to watch it