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.
8 products found
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All sizes at a glance
8 articles in 1 series. The article number links straight to the tool.
V-COIL Wire thread insert Free running type S
| Threadnominal size | Tapping drillØ in mm | 1.5 D |
|---|---|---|
| UNx8 1.1/8 x 8 | 28.75 | 087315 pcs. |
| UNx8 1.1/4 x 8 | 31.75 | 087325 pcs. |
| UNx8 1.3/8 x 8 | 35 | 087335 pcs. |
| UNx8 1.1/2 x 8 | 38 | 087345 pcs. |
| UNx8 1.5/8 x 8 | 41.5 | 087355 pcs. |
| UNx8 1.3/4 x 8 | 44.5 | 087365 pcs. |
| UNx8 1.7/8 x 8 | 47.75 | 087375 pcs. |
| UNx8 2" x 8 | 50.9 | 087385 pcs. |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes V-COIL”).
