BLIND SELF-TAPPING 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 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 M4 to M20 sizes.

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.

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. 

Blind threaded inserts have an internal and external thread and are self-cutting, and are supplied in a choice of steel, stainless steel 303 or marine grade stainless steel 316:

Blind Inserts Length ID OD OD Thread Type & Pitch Cutting Relief
M4 9mm M4 x 0.7mm 6.0mm 30 degree flank self tapping P=1.25mm 3 x milled notch
M5 10mm M5 x 0.8mm 8.0mm 30 degree flank self tapping P=1.5mm 3 x milled notch
M6 12mm M6 x 1.0mm 9.0mm 30 degree flank self tapping P=1.75mm 3 x milled notch
M6 30mm M6 Heavy Duty 18.0mm 30 degree flank self tapping P=3.0mm 3 x milled notch
M8 15mm M8 x 1.25mm 12.0mm 30 degree flank self tapping P=2.0mm 3 x milled notch
M8 30mm M8 Heavy Duty 20.0mm 30 degree flank self tapping P=3.0mm 3 x milled notch
M10 20mm M10 x 1.5mm 14.0mm 30 degree flank self tapping P=2.5mm 3 x milled notch
M10 30mm M10 Heavy Duty 20.0mm 30 degree flank self tapping P=3.0mm 3 x milled notch
M12 25mm M12 x 1.75mm 16.0mm 30 degree flank self tapping P=2.75mm 3 x milled notch
M16 35mm M16 x 2.0mm 25.0mm 30 degree flank self tapping P=3.50mm 3 x milled notch
M20 40mm M20 x 2.5mm 30.0mm 30 degree flank self tapping P=3.50mm 3 x milled notch