Threaded inserts for plastics and alloys
Over the years the Tappex name has become synonymous with the design and manufacture of threaded inserts for plastics and, more recently, non-ferrous castings. Threaded parts for plastics in both male and female parts for use in all grads of plastics. products are available for most pre/in/post-mould applications, and include more than 20 standards and variations from M1.6 to M12 diameters and larger. The fasteners are manufactured in-house from machine grade brass, case-hardening and stainless steels to suit specific installation and environment requirements.
To this range Tappex recently added the Trisert-3 - a new range of steel fasteners for plastic and metal alloy applications. Designed for robust performance in critical applications these fasteners are available in two grades of stainless steel (303 and 316) and also in case hardened steel with zinc nickel, trivalent passivated finish. This fastener range is primarily for post-mould installation and features three cutting features to provide more balanced cutting forces. As a result, reduced installation torque is required, compared to many cross-slot designs available, that only have two cutting features.
The Trisert-3 design maintains the complete cylinder that provides a stronger body, size for size, than a slotted design and allows it to be used in both pull-in and push-through applications, without any problems due to the increased assembly torque associated with slotted designs. Trisert-3 is able to withstand harsh environments and corrosive atmospheres.
To enable hand installation of its Trisert and Trisert-3 self tapping inserts in thread sizes from M2 to M10, Tappex has introduced a new Hand Tool Assembly with a range of features to assist the operator in quick and consistent installation. Used in conjunction with the company's recommended hole designs for the customer's grade of plastic or metal alloys, and cutting fluid where required, this tool will help to maximise the performance of the insert in a given application. The alignment bush is not hardened and may be removed or machined to allow its use in mould corners or where access is restricted.
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