BLIND SELF-TAPPING THREADED INSERTS
Blind threaded inserts offer standard metric internal threads with 30 degree inclusive form coarse pitch self-tapping external threads. We would recommend blind self-tapping inserts (Series STB) for use in applications where fluid ingression along the internal thread could be an issue. The coarse thread of this type of insert is designed to give more strength, particularly when used on composite materials or softer materials such as wood, fibreglass or plastics. We can custom manufacture inserts to drawing, and our standard range spans M2 to M20 sizes in marine grade stainless steel 316 (A4) or stainless steel 303 (A2) - request a quote today.
We also produce a more robust, heavy duty version of the popular M6, M8 and M10 sizes, with a length of 30mm, to give more external surface area and a deeper, courser thread than the standard inserts. It will also provide more grip strength and is suited to heavier duty applications and are again, available in marine grade stainless steel.
The insert has a 45 degree shoulder with an undercut to seat it when fully inserted, this provides an area where a sealant or bonding agent can be applied to prevent any fluids passing along the external surface of the insert into the host material or the area behind the insert. The lead-in is chamfered at 10 degrees, with three notches milled into it, to help remove host material, provide a sharp cutting edge and assist keeping the insert parallel on insertion.