Hand taps for G pipe thread (BSP)
G is the parallel British pipe thread. It does not seal in the thread itself but through a gasket on the seating face, which is why diameter and pitch stay the same over the whole length. 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 179 versions to DIN 5157 and ISO 529, in HSS-G and HSSE, from G 1/16 x 28 to G 4" x 11. Lead forms A, C and D cover through holes and blind holes.
All sizes at a glance
179 articles in 4 series. The article number links straight to the tool.
Series: Hand Tap ISO 529 HSS-G · Hand Tap DIN 5157 HSS-G · Hand Tap JIS B-4430 HSS-G · Hand Tap DIN 5157 HSSE
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 |
|---|---|---|---|---|---|
| G (BSP) 1/8 x 28 | 8.8 | 86412 | 86412-1 | 86412-3 | 86412-2 |
| G (BSP) 1/4 x 19 | 11.8 | 86414 | 86414-1 | 86414-3 | 86414-2 |
| G (BSP) 3/8 x 19 | 15.25 | 86416 | 86416-1 | 86416-3 | 86416-2 |
| G (BSP) 1/2 x 14 | 19 | 86418 | 86418-1 | 86418-3 | 86418-2 |
| G (BSP) 5/8 x 14 | 21 | 86420 | 86420-1 | 86420-3 | 86420-2 |
| G (BSP) 3/4 x 14 | 24.5 | 86422 | 86422-1 | 86422-3 | 86422-2 |
| G (BSP) 7/8 x 14 | 28.25 | 86424 | 86424-1 | 86424-3 | 86424-2 |
| G (BSP) 1" x 11 | 30.75 | 86426 | 86426-1 | 86426-3 | 86426-2 |
| G (BSP) 1.1/8 x 11 | 35.3 | 86430 | 86430-1 | 86430-3 | 86430-2 |
| G (BSP) 1.1/4 x 11 | 39.5 | 86434 | 86434-1 | 86434-3 | 86434-2 |
| G (BSP) 1.1/2 x 11 | 45.25 | 86442 | 86442-1 | 86442-3 | 86442-2 |
| G (BSP) 1.3/4 x 11 | 51.1 | 86448 | 86448-1 | 86448-3 | 86448-2 |
| G (BSP) 2" x 11 | 57 | 86454 | 86454-1 | 86454-3 | 86454-2 |
| G (BSP) 2.1/4 x 11 | 63.1 | 86458 | 86458-1 | 86458-3 | 86458-2 |
| G (BSP) 2.1/2 x 11 | 72.6 | 86460 | 86460-1 | 86460-3 | 86460-2 |
| G (BSP) 3" x 11 | 85.3 | 86464 | 86464-1 | 86464-3 | 86464-2 |
| G (BSP) 4" x 11 | – | 86478 | 86478-1 | 86478-3 | 86478-2 |
Hand Tap DIN 5157 HSS-G
| Threadnominal size | Tapping drillØ in mm | set of 2 pieces | Rougher | Finisher |
|---|---|---|---|---|
| G (BSP) 1/8 x 28 | 8.8 | 25312 | 25312-1 | 25312-2 |
| G (BSP) 1/4 x 19 | 11.8 | 25314 | 25314-1 | 25314-2 |
| G (BSP) 3/8 x 19 | 15.25 | 25316 | 25316-1 | 25316-2 |
| G (BSP) 1/2 x 14 | 19 | 25318 | 25318-1 | 25318-2 |
| G (BSP) 5/8 x 14 | 21 | 25320 | 25320-1 | 25320-2 |
| G (BSP) 3/4 x 14 | 24.5 | 25322 | 25322-1 | 25322-2 |
| G (BSP) 7/8 x 14 | 28.25 | 25324 | 25324-1 | 25324-2 |
| G (BSP) 1" x 11 | 30.75 | 25326 | 25326-1 | 25326-2 |
| G (BSP) 1.1/8 x 11 | 35.3 | 25330 | 25330-1 | 25330-2 |
| G (BSP) 1.1/4 x 11 | 39.5 | 25334 | 25334-1 | 25334-2 |
| G (BSP) 1.3/8 x 11 | 41.7 | 25338 | 25338-1 | 25338-2 |
| G (BSP) 1.1/2 x 11 | 45.25 | 25342 | 25342-1 | 25342-2 |
| G (BSP) 1.5/8 x 11 | – | 25346 | 25346-1 | 25346-2 |
| G (BSP) 1.3/4 x 11 | 51.1 | 25350 | 25350-1 | 25350-2 |
| G (BSP) 2" x 11 | 57 | 25354 | 25354-1 | 25354-2 |
| G (BSP) 2.1/4 x 11 | 63.1 | 25358 | 25358-1 | 25358-2 |
| G (BSP) 2.1/2 x 11 | 72.6 | 25362 | 25362-1 | 25362-2 |
| G (BSP) 2.3/4 x 11 | 78.9 | 25366 | 25366-1 | 25366-2 |
| G (BSP) 3" x 11 | 85.3 | 25370 | 25370-1 | 25370-2 |
| G (BSP) 3.1/2 x 11 | – | 25374 | 25374-1 | 25374-2 |
| G (BSP) 4" x 11 | – | 25378 | 25378-1 | 25378-2 |
Hand Tap JIS B-4430 HSS-G
| Threadnominal size | Tapping drillØ in mm | set of 2 pieces | Taper Form A | Bottoming Form C |
|---|---|---|---|---|
| G (BSP) 1/16 x 28 | – | 96402 | 96402-1 | 96402-3 |
| G (BSP) 1/8 x 28 | 8.8 | 96406 | 96406-1 | 96406-3 |
| G (BSP) 1/4 x 19 | 11.8 | 96414 | 96414-1 | 96414-3 |
| G (BSP) 3/8 x 19 | 15.25 | 96418 | 96418-1 | 96418-3 |
| G (BSP) 1/2 x 14 | 19 | 96422 | 96422-1 | 96422-3 |
| G (BSP) 3/4 x 14 | 24.5 | 96430 | 96430-1 | 96430-3 |
| G (BSP) 1" x 11 | 30.75 | 96438 | 96438-1 | 96438-3 |
| G (BSP) 1.1/4 x 11 | 39.5 | 96446 | 96446-1 | 96446-3 |
| G (BSP) 1.1/2 x 11 | 45.25 | 96454 | 96454-1 | 96454-3 |
| G (BSP) 2" x 11 | 57 | 96470 | 96470-1 | 96470-3 |
Hand Tap DIN 5157 HSSE
| Threadnominal size | Tapping drillØ in mm | set of 2 pieces | Rougher | Finisher |
|---|---|---|---|---|
| G (BSP) 1/8 x 28 | 8.8 | 55312 | 55312-1 | 55312-2 |
| G (BSP) 1/4 x 19 | 11.8 | 55314 | 55314-1 | 55314-2 |
| G (BSP) 3/8 x 19 | 15.25 | 55316 | 55316-1 | 55316-2 |
| G (BSP) 1/2 x 14 | 19 | 55318 | 55318-1 | 55318-2 |
| G (BSP) 3/4 x 14 | 24.5 | 55322 | 55322-1 | 55322-2 |
| G (BSP) 1" x 11 | 30.75 | 55326 | 55326-1 | 55326-2 |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
