Machine taps for BSW, Whitworth thread
Whitworth is the oldest standardised thread of all and still turns up on British machines, classic vehicles and older installations. The flank angle is 55° instead of the 60° of the metric thread, and the crests are rounded. Machine taps cut the thread in a single pass and run in a drilling machine, a machining centre or a tapping attachment.
VÖLKEL offers 107 versions to DIN 371, DIN 376 and ISO 529, in HSS-G and HSSE, from BSW 1/8 x 40 to BSW 2.1/2 x 4. Lead forms B and C cover through holes and blind holes.
All sizes at a glance
107 articles in 4 series. The article number links straight to the tool.
Series: Machine Tap ISO 529 HSS-G · Machine Tap JIS B-4430 HSSE · Machine Tap DIN 376 HSSE · Machine Tap DIN 371 HSSE
Machine Tap ISO 529 HSS-G
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° Spiral Flute |
|---|---|---|---|
| BSW 1/8 x 40 | 2.6 | 84506 | 84706 |
| BSW 5/32 x 32 | 3.1 | 84508 | – |
| BSW 3/16 x 24 | 3.6 | 84510 | 84710 |
| BSW 7/32 x 24 | 4.4 | 84512 | – |
| BSW 1/4 x 20 | 5.1 | 84514 | 84714 |
| BSW 5/16 x 18 | 6.5 | 84516 | 84716 |
| BSW 3/8 x 16 | 7.9 | 84518 | 84718 |
| BSW 7/16 x 14 | 9.3 | 84520 | 84720 |
| BSW 1/2 x 12 | 10.5 | 84522 | 84722 |
| BSW 9/16 x 12 | 12 | 84524 | 84724 |
| BSW 5/8 x 11 | 13.5 | 84526 | 84726 |
| BSW 3/4 x 10 | 16.5 | 84530 | 84730 |
| BSW 7/8 x 9 | 19.25 | 84534 | 84734 |
| BSW 1" x 8 | 22 | 84538 | 84738 |
| BSW 1.1/8 x 7 | 24.75 | 84540 | 84740 |
| BSW 1.1/4 x 7 | 27.75 | 84542 | 84742 |
| BSW 1.3/8 x 7 | 30.2 | – | 84744 |
| BSW 1.1/2 x 6 | 33.5 | 84546 | 84746 |
| BSW 1.5/8 x 5 | – | 84548 | – |
| BSW 1.3/4 x 5 | 38.5 | 84550 | – |
| BSW 2.1/4 x 4 | – | 84556 | – |
| BSW 2.1/2 x 4 | – | 84558 | – |
Machine Tap JIS B-4430 HSSE
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° Spiral Flute |
|---|---|---|---|
| BSW 1/8 x 40 | 2.6 | 94506 | 94706 |
| BSW 5/32 x 32 | 3.1 | 94508 | 94708 |
| BSW 3/16 x 24 | 3.6 | 94510 | 94710 |
| BSW 1/4 x 20 | 5.1 | 94514 | 94714 |
| BSW 5/16 x 18 | 6.5 | 94516 | 94716 |
| BSW 3/8 x 16 | 7.9 | 94518 | 94718 |
| BSW 7/16 x 14 | 9.3 | 94520 | 94720 |
| BSW 1/2 x 13 | 10.5 | 94522 | 94722 |
| BSW 9/16 x 12 | 12 | 94524 | 94724 |
| BSW 5/8 x 11 | 13.5 | 94526 | 94726 |
| BSW 3/4 x 10 | 16.5 | 94530 | 94730 |
| BSW 7/8 x 9 | 19.25 | 94534 | 94734 |
| BSW 1" x 8 | 22 | 94538 | 94738 |
| BSW 1.1/4 x 17 | 27.75 | 94540 | 94740 |
Machine Tap DIN 376 HSSE
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° Spiral Flute |
|---|---|---|---|
| BSW 1/4 x 20 | 5.1 | 71514 | 71714 |
| BSW 5/16 x 18 | 6.5 | 71516 | 71716 |
| BSW 3/8 x 16 | 7.9 | 71518 | 71718 |
| BSW 7/16 x 14 | 9.3 | 71520 | 71720 |
| BSW 1/2 x 12 | 10.5 | 71522 | 71722 |
| BSW 9/16 x 12 | 12 | 71524 | 71724 |
| BSW 5/8 x 11 | 13.5 | 71526 | 71726 |
| BSW 3/4 x 10 | 16.5 | 71530 | 71730 |
| BSW 7/8 x 9 | 19.25 | 71534 | 71734 |
| BSW 1" x 8 | 22 | 71538 | 71738 |
| BSW 1.1/4 x 7 | 27.75 | 71546 | 71746 |
| BSW 1.3/8 x 6 | 30.2 | 71550 | 71750 |
| BSW 1.1/2 x 6 | 33.5 | 71554 | 71754 |
Machine Tap DIN 371 HSSE
| Threadnominal size | Tapping drillØ in mm | Form B | Form C 35° Spiral Flute |
|---|---|---|---|
| BSW 1/8 x 40 | 2.6 | 70506 | 70706 |
| BSW 5/32 x 32 | 3.1 | 70508 | 70708 |
| BSW 3/16 x 24 | 3.6 | 70510 | 70710 |
| BSW 1/4 x 20 | 5.1 | 70514 | 70714 |
| BSW 5/16 x 18 | 6.5 | 70516 | 70716 |
| BSW 3/8 x 16 | 7.9 | 70518 | 70718 |
| BSW 7/16 x 14 | 9.3 | 70520 | 70720 |
| BSW 1/2 x 12 | 10.5 | 70522 | 70722 |
Tapping drill: drill diameter recommended by VÖLKEL (Technical Information “Tapping drill sizes”).
