Hand taps 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. 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 64 versions to ISO 529, in HSS-G, from UN 1.1/8 x 8 to UN 4" x 8. Lead forms A, C and D cover through holes and blind holes.
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All sizes at a glance
64 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 |
|---|---|---|---|---|---|
| UN 1.1/8 x 8 | 25.5 | 82940 | 82940-1 | 82940-3 | 82940-2 |
| UN 1.1/4 x 8 | 28.75 | 82942 | 82942-1 | 82942-3 | 82942-2 |
| UN 1.3/8 x 8 | 31.75 | 82944 | 82944-1 | 82944-3 | 82944-2 |
| UN 1.1/2 x 8 | 35 | 82946 | 82946-1 | 82946-3 | 82946-2 |
| UN 1.5/8 x 8 | 38 | 82947 | 82947-1 | 82947-3 | 82947-2 |
| UN 1.3/4 x 8 | 41.5 | 82948 | 82948-1 | 82948-3 | 82948-2 |
| UN 1.7/8 x 8 | 44.5 | 82949 | 82949-1 | 82949-3 | 82949-2 |
| UN 2" x 8 | 47.75 | 82950 | 82950-1 | 82950-3 | 82950-2 |
| UN 2.1/8 x 8 | 50.9 | 82951 | 82951-1 | 82951-3 | 82951-2 |
| UN 2.1/4 x 8 | 54 | 82952 | 82952-1 | 82952-3 | 82952-2 |
| UN 2.3/8 x 8 | – | 82953 | 82953-1 | 82953-3 | 82953-2 |
| UN 2.1/2 x 8 | 60.4 | 82954 | 82954-1 | 82954-3 | 82954-2 |
| UN 2.3/4 x 8 | 66.7 | 82956 | 82956-1 | 82956-3 | 82956-2 |
| UN 3" x 8 | 73.1 | 82958 | 82958-1 | 82958-3 | 82958-2 |
| UN 3.1/2 x 8 | 85.8 | 82960 | 82960-1 | 82960-3 | 82960-2 |
| UN 4" x 8 | 98.5 | 82962 | 82962-1 | 82962-3 | 82962-2 |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
