V-COIL thread inserts for UN-8, Unified constant-pitch thread

Eight threads per inch across all diameters — the series for large threads where a proportional pitch would come out too coarse. A thread insert restores a stripped thread and can give it a load capacity above that of the original. The stainless steel wire coil is screwed into the hole after it has been drilled out and re-tapped with the STI tool.

VÖLKEL offers 8 versions.