Machine taps for 8-UN, 12-UN, UNS and UN
These series hold the pitch constant across all diameters — eight or twelve threads per inch — instead of letting it grow with the diameter. UNS and UN cover the special pitches outside the standard series. Machine taps cut the thread in a single pass and run in a drilling machine, a machining centre or a tapping attachment.
VÖLKEL offers 90 versions to ISO 529, in HSSE, from UN 5/16 x 20 to UN 4" x 12, plus UNS 1/4 x 24 to UNS 1" x 14. Lead forms B and C cover through holes and blind holes.
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All sizes at a glance
90 articles in 1 series. The article number links straight to the tool.
Machine Tap ISO 529 HSSE
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° Spiral Flute |
|---|---|---|---|
| UN 5/16 x 20 | – | 83220 | – |
| UN 5/16 x 28 | 7 | 83221 | – |
| UN 3/8 x 20 | 8.3 | 83222 | – |
| UN 3/8 x 28 | 8.6 | 83223 | – |
| UN 7/16 x 32 | 10.3 | 83224 | – |
| UN 1/2 x 32 | 11.9 | 83225 | – |
| UN 9/16 x 20 | 10.9 | 83226 | – |
| UN 9/16 x 28 | 11.3 | 83227 | – |
| UN 9/16 x 32 | 11.4 | 83228 | – |
| UN 5/8 x 20 | 14.6 | 83229 | – |
| UN 5/8 x 28 | 15 | 83230 | – |
| UN 11/16 x 16 | 15.9 | 83232 | – |
| UN 11/16 x 20 | 16.2 | 83231 | – |
| UN 1" x 32 | 24.6 | 83233 | – |
| UN 1.1/16 x 8 | 23.9 | 83101 | 83151 |
| UN 1.1/8 x 8 | 25.5 | 83102 | 83152 |
| UN 1.3/16 x 8 | 27.1 | 83103 | 83153 |
| UN 1.1/4 x 8 | 28.75 | 83104 | 83154 |
| UN 1.5/16 x 8 | 30.3 | 83105 | 83155 |
| UN 1.3/8 x 8 | 31.75 | 83106 | 83156 |
| UN 1.1/2 x 8 | 35 | 83107 | 83157 |
| UN 1.5/8 x 8 | 38 | 83108 | 83158 |
| UN 1.5/8 x 12 | 39.2 | 83301 | 83351 |
| UN 1.3/4 x 8 | 41.5 | 83109 | 83159 |
| UN 1.3/4 x 12 | 42.4 | 83302 | 83352 |
| UN 1.7/8 x 8 | 44.5 | 83110 | 83160 |
| UN 1.7/8 x 12 | 45.6 | 83303 | 83353 |
| UN 2" x 8 | 47.75 | 83111 | 83161 |
| UN 2" x 12 | 48.75 | 83304 | 83354 |
| UN 2.1/8 x 8 | 50.9 | 83112 | 83162 |
| UN 2.1/8 x 12 | 51.9 | 83305 | 83355 |
| UN 2.1/4 x 8 | 54 | 83113 | 83163 |
| UN 2.1/4 x 12 | 55.1 | 83306 | 83356 |
| UN 2.1/2 x 8 | 60.4 | 83115 | 83165 |
| UN 2.1/2 x 12 | 61.5 | 83308 | 83358 |
| UN 2.3/4 x 8 | 66.7 | 83116 | 83166 |
| UN 2.3/4 x 12 | 67.8 | 83309 | 83359 |
| UN 3" x 8 | 73.1 | 83117 | 83167 |
| UN 3" x 12 | 74.2 | 83310 | 83360 |
| UN 3.1/4 x 8 | 79.4 | 83118 | 83168 |
| UN 3.1/4 x 12 | 80.5 | 83311 | 83361 |
| UN 3.1/2 x 8 | 85.8 | 83119 | 83169 |
| UN 3.1/2 x 12 | 86.9 | 83312 | 83362 |
| UN 3.3/4 x 8 | 92.1 | 83120 | 83170 |
| UN 3.3/4 x 12 | 93.2 | 83313 | 83363 |
| UN 4" x 8 | 98.5 | 83121 | 83171 |
| UN 4" x 12 | 99.6 | 83314 | 83364 |
| UNS 1/4 x 24 | 5.4 | 83201 | – |
| UNS 1/4 x 36 | 5.7 | 83202 | – |
| UNS 1/4 x 40 | 5.75 | 83203 | – |
| UNS 3/8 x 27 | 8.35 | 83204 | – |
| UNS 7/16 x 24 | 10.1 | 83205 | – |
| UNS 1/2 x 24 | 11.75 | 83206 | – |
| UNS 5/8 x 27 | 14.7 | 83207 | – |
| UNS 3/4 x 24 | 18 | 83208 | – |
| UNS 7/8 x 18 | 21 | 83209 | – |
| UNS 1" x 14 | 23.75 | 83210 | – |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
