Hand taps for UNEF, Unified extra fine thread
UNEF is finer still than UNF. It appears in thin-walled sleeves, fittings and instruments where there is simply no wall thickness for a coarser thread. Hand taps are turned by hand in a tap wrench. The thread is cut in several passes, because the work is shared between taper, second and bottoming tap.
VÖLKEL offers 40 versions to ISO 529, in HSS-G, from UNEF 1/4 x 32 to UNEF 1" x 20. Lead forms A, C and D cover through holes and blind holes.
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40 articles in 1 series. The article number links straight to the tool.
Hand Tap ISO 529 HSS-G
| Threadnominal size | Tapping drillØ in mm | set of 3 pieces | Taper Form A | Bottoming Form C | Second Form D |
|---|---|---|---|---|---|
| UNEF 1/4 x 32 | 5.6 | 83821 | 83821-1 | 83821-3 | 83821-2 |
| UNEF 5/16 x 32 | 7.2 | 83822 | 83822-1 | 83822-3 | 83822-2 |
| UNEF 3/8 x 32 | 8.8 | 83823 | 83823-1 | 83823-3 | 83823-2 |
| UNEF 7/16 x 28 | 10.25 | 83824 | 83824-1 | 83824-3 | 83824-2 |
| UNEF 1/2 x 28 | 11.8 | 83825 | 83825-1 | 83825-3 | 83825-2 |
| UNEF 9/16 x 24 | 13.3 | 83826 | 83826-1 | 83826-3 | 83826-2 |
| UNEF 5/8 x 24 | 14.9 | 83827 | 83827-1 | 83827-3 | 83827-2 |
| UNEF 3/4 x 20 | 17.75 | 83829 | 83829-1 | 83829-3 | 83829-2 |
| UNEF 7/8 x 20 | 21 | 83831 | 83831-1 | 83831-3 | 83831-2 |
| UNEF 1" x 20 | 24.25 | 83833 | 83833-1 | 83833-3 | 83833-2 |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
