Technifast have a range of self-tapping inserts which are suitable for use with light metals such as aluminium.  View the details and size charts below to determine the most appropriate insert for your particular application.  For non standard threaded inserts, please contact our manufacturing team for details.

Series 300 Inserts

Series 300 inserts are self-tapping inserts with a fine external thread for use in harder materials, such as light metals and other non-ferrous metals, as well as plastics and thermosetting resins. A feature of the Series 300 insert is the slot cut into the insertion end at 180 degrees, this slot aids the removal of host material and provides a sharp cutting edge.

This series is available in case hardened steel (plated zinc and yellow passivate), brass and stainless steel 303 or marine grade stainless steel 316.  

The insert must always be inserted slotted end first, as the slot provides the cutting action to tap into the application material.

Nominal Thread Size M3 M4 M5 M6 M8 M10 M12 M14 M16
External Thread Size M5 X0.5 M6.5 X 0.75 M8 X 1 M10 X 1.5 M12  X 1.5 M14 X 1.5 M16 X 1.5 M18 X 1.5 M20 X 1.5
Length (mm) 6 8 10 14 15 18 22 24 25
Recommended Hole Size Min / Max 4.6 / 4.8 5.8 / 6.2 7.1/ 7.6 8.6 / 9.4 10.06 / 11.4 12.6 / 13.4 14.6 / 15.4 16.6 / 17.4 18.6 / 19.4


Series 301 Inserts

This type of insert is similar to Series 300 Inserts, but has a special 30 degree external tapping thread, and three milled notches to aid the cutting action. 

Also available with a blind tapped thread in Series 303, these inserts are manufactured in stainless steel 303 and marine grade stainless steel 316.

Nominal Thread Size M4 M5 M6 M8 M10 M12
Length 10mm 12mm 14mm 16mm 20mm 26mm
ID M4 X 0.7 M5 X 0.8 M6 X 1.0 M8 X 1.25 M10 X 1.5 M12 X 1.75
OD 6.0mm 8.0mm 9.0mm 12.0mm 14.0mm 16.0mm
OD Thread-Type & Pitch 30 degree flank self-tapping P=1.25mm 30 degree flank self-tapping P=1.5mm 30 degree flank self-tapping P=1.75mm 30 degree flank self-tapping P=2.0mm 30 degree flank self-tapping P=2.5mm 30 degree flank self-tapping P=2.75mm
Cutting Relief 3 x milled notch 3 x milled notch 3 x milled notch 3 x milled notch 3 x milled notch 3 x milled notch