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Helo Coil Tang Break-Off & Extraction Tools The driving tangs of helicoil inserts should be removed to eliminate their interference with the end of the assembled bolt. Their removal provides greater latitude in the depth location of the bolt. Manual tangbreak-off tools are available for use with inserts up through 18mm / 3/4" nominal diameter. Auto /spring loaded tang break-off tools are available for use with inserts up through 12mm / 1/2" nominal diameter. The operation of auto tang break-off tools is automatic, having a springloaded, easily triggered punch that strikes a sharp, uniform blow against the tang of the installed insert. It can be operated with one hand. For larger sizes use long nosed pliers. Bend tang up and down to snap off at notch. Tools to remove helicoil inserts are available for ranges M1. 6, M2 – M2. 2, 2. 5 - 4. 5mm, 3 - 8,. 5 - 10mm, 10 - 3/8", 11- 24mm, 7/16" - 1", 27 - 39mm, 1-1/8" - 1-1/2". Extraction is done by applying the tool to the insert, striking the head of the tool a light blow and turning it counterclockwise, maintaining steady downward pressure.