V-COIL thread inserts for UNC, Unified coarse thread
UNC is the standard series for screws and nuts in the USA and Canada. Nominal diameters are given in inches and as gauge numbers, the pitch as threads per inch. 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 174 versions, from UNC No. 2 x 56 to UNC 1.1/2 x 6.
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All sizes at a glance
174 articles in 2 series. The article number links straight to the tool.
V-COIL Wire thread insert Free running type S
| Threadnominal size | Tapping drillØ in mm | 1.0 D | 1.5 D | 2.0 D | 2.5 D | 3.0 D |
|---|---|---|---|---|---|---|
| UNC No. 2 x 56 | 2.4 | 08200100 pcs. | 08300100 pcs. | 08400100 pcs. | 08500100 pcs. | 08600100 pcs. |
| UNC No. 4 x 40 | 3 | 08201100 pcs. | 08301100 pcs. | 08401100 pcs. | 08501100 pcs. | 08601100 pcs. |
| UNC No. 5 x 40 | 3.4 | 08202100 pcs. | 08302100 pcs. | 08402100 pcs. | 08502100 pcs. | 08602100 pcs. |
| UNC No. 6 x 32 | 3.7 | 08203100 pcs. | 08303100 pcs. | 08403100 pcs. | 08503100 pcs. | 08603100 pcs. |
| UNC No. 8 x 32 | 4.4 | 08204100 pcs. | 08304100 pcs. | 08404100 pcs. | 08504100 pcs. | 08604100 pcs. |
| UNC No. 10 x 24 | 5.1 | 08205100 pcs. | 08305100 pcs. | 08405100 pcs. | 08505100 pcs. | 08605100 pcs. |
| UNC No. 12 x 24 | 5.7 | 08206100 pcs. | 08306100 pcs. | 08406100 pcs. | 08506100 pcs. | 08606100 pcs. |
| UNC 1/4 x 20 | 6.7 | 08207 | 08307100 pcs. | 08407100 pcs. | 08507100 pcs. | 08607100 pcs. |
| UNC 5/16 x 18 | 8.3 | 08208100 pcs. | 08308100 pcs. | 08408100 pcs. | 08508100 pcs. | 08608100 pcs. |
| UNC 3/8 x 16 | 9.9 | 08209 | 08309100 pcs. | 08409100 pcs. | 08509100 pcs. | 08609100 pcs. |
| UNC 7/16 x 14 | 11.6 | 08210100 pcs. | 08310 | 08410100 pcs. | 08510100 pcs. | 08610100 pcs. |
| UNC 1/2 x 13 | 13 | 08211100 pcs. | 08311100 pcs. | 08411100 pcs. | 08511100 pcs. | 08611100 pcs. |
| UNC 9/16 x 12 | 14.8 | 0821250 pcs. | 0831250 pcs. | 0841250 pcs. | 0851250 pcs. | 0861250 pcs. |
| UNC 5/8 x 11 | 16.5 | 0821450 pcs. | 0831450 pcs. | 0841450 pcs. | 0851450 pcs. | 0861450 pcs. |
| UNC 3/4 x 10 | 19.75 | 0821625 pcs. | 0831625 pcs. | 0841625 pcs. | 0851625 pcs. | 0861625 pcs. |
| UNC 7/8 x 9 | 23 | 0821810 pcs. | 0831810 pcs. | 0841810 pcs. | 0851810 pcs. | 0861810 pcs. |
| UNC 1" x 8 | 26.25 | 0821910 pcs. | 0831910 pcs. | 0841910 pcs. | 0851910 pcs. | 0861910 pcs. |
| UNC 1.1/8 x 7 | 29.5 | – | 083205 pcs. | – | – | – |
| UNC 1.1/4 x 7 | 33 | – | 083215 pcs. | – | – | – |
| UNC 1.3/8 x 6 | 36 | – | 083225 pcs. | – | – | – |
| UNC 1.1/2 x 6 | 39.5 | – | 083235 pcs. | – | – | – |
V-COIL Wire thread inserts Refill pack Free running type S
| Threadnominal size | Tapping drillØ in mm | 1.0 D | 1.5 D | 2.0 D | 2.5 D | 3.0 D |
|---|---|---|---|---|---|---|
| UNC No. 2 x 56 | 2.4 | 4420010 pcs. | 4430010 pcs. | 4440010 pcs. | 4450010 pcs. | 4460010 pcs. |
| UNC No. 4 x 40 | 3 | 4420110 pcs. | 4430110 pcs. | 4440110 pcs. | 4450110 pcs. | 4460110 pcs. |
| UNC No. 5 x 40 | 3.4 | 4420210 pcs. | 4430210 pcs. | 4440210 pcs. | 4450210 pcs. | 4460210 pcs. |
| UNC No. 6 x 32 | 3.7 | 4420310 pcs. | 4430310 pcs. | 4440310 pcs. | 4450310 pcs. | 4460310 pcs. |
| UNC No. 8 x 32 | 4.4 | 4420410 pcs. | 4430410 pcs. | 4440410 pcs. | 4450410 pcs. | 4460410 pcs. |
| UNC No. 10 x 24 | 5.1 | 4420510 pcs. | 4430510 pcs. | 4440510 pcs. | 4450510 pcs. | 4460510 pcs. |
| UNC No. 12 x 24 | 5.7 | 4420610 pcs. | 4430610 pcs. | 4440610 pcs. | 4450610 pcs. | 4460610 pcs. |
| UNC 1/4 x 20 | 6.7 | 4420710 pcs. | 4430710 pcs. | 4440710 pcs. | 4450710 pcs. | 4460710 pcs. |
| UNC 5/16 x 18 | 8.3 | 4420810 pcs. | 4430810 pcs. | 4440810 pcs. | 4450810 pcs. | 4460810 pcs. |
| UNC 3/8 x 16 | 9.9 | 442095 pcs. | 443095 pcs. | 444095 pcs. | 445095 pcs. | 446095 pcs. |
| UNC 7/16 x 14 | 11.6 | 442105 pcs. | 443105 pcs. | 444105 pcs. | 445105 pcs. | 446105 pcs. |
| UNC 1/2 x 13 | 13 | 442115 pcs. | 443115 pcs. | 444115 pcs. | 445115 pcs. | 446115 pcs. |
| UNC 9/16 x 12 | 14.8 | 442125 pcs. | 443125 pcs. | 444125 pcs. | 445125 pcs. | 446125 pcs. |
| UNC 5/8 x 11 | 16.5 | 442135 pcs. | 443145 pcs. | 444145 pcs. | 445135 pcs. | 446145 pcs. |
| UNC 3/4 x 10 | 19.75 | 442165 pcs. | 443165 pcs. | 444165 pcs. | 445165 pcs. | 446165 pcs. |
| UNC 7/8 x 9 | 23 | 442185 pcs. | 443185 pcs. | 444185 pcs. | 445185 pcs. | 446185 pcs. |
| UNC 1" x 8 | 26.25 | 442195 pcs. | 443195 pcs. | 444195 pcs. | 445195 pcs. | 446195 pcs. |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes V-COIL”).
