Machine taps for UNC left-hand thread
The left-hand version of the Unified coarse thread, for parts whose direction of rotation would loosen a right-hand thread. Machine taps cut the thread in a single pass and run in a drilling machine, a machining centre or a tapping attachment.
VÖLKEL offers 26 versions to DIN 371 and DIN 376, in HSSE, from UNC No. 6 x 32 to UNC 1" x 8. Lead forms B and C cover through holes and blind holes.
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All sizes at a glance
26 articles in 2 series. The article number links straight to the tool.
Machine Tap DIN 376 HSSE left hand thread
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° SP |
|---|---|---|---|
| UNC 7/16 x 14 LH | 9.4 | 74228 | 74248 |
| UNC 1/2 x 13 LH | 10.8 | 74229 | 74249 |
| UNC 9/16 x 12 LH | 12.2 | 74230 | 74250 |
| UNC 5/8 x 11 LH | 13.5 | 74231 | 74251 |
| UNC 3/4 x 10 LH | 16.5 | 74232 | 74252 |
| UNC 7/8 x 9 LH | 19.5 | 74233 | 74253 |
| UNC 1" x 8 LH | 22.25 | 74234 | 74254 |
Machine Tap DIN 371 HSSE left hand thread
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° SP |
|---|---|---|---|
| UNC No. 6 x 32 LH | 2.85 | 74203 | 74212 |
| UNC No. 8 x 32 LH | 3.5 | 74204 | 74213 |
| UNC No. 10 x 24 LH | 3.9 | 74205 | 74214 |
| UNC 1/4 x 20 LH | 5.2 | 74207 | 74216 |
| UNC 5/16 x 18 LH | 6.6 | 74208 | 74217 |
| UNC 3/8 x 16 LH | 8 | 74209 | 74218 |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
