thread conversion specialists - redapt · pdf filethread form comparison chart note 1:pf...
TRANSCRIPT
THREAD DIMENSION CHARTSNational Pipe Taper
NPT3⁄8"1⁄2"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
31⁄2"4"
Major Dia.17.05mm21.22mm26.57mm33.23mm41.99mm48.05mm60.09mm72.70mm88.61mm101.60mm114.30mm
TPI181414
11.511.511.511.5
8888
PG DIN 40430PG
PG7PG9PG11
PG13.5PG16PG21PG29PG36PG42PG48
Major Dia.12.50mm15.20mm18.60mm20.40mm22.50mm28.30mm37.00mm47.00mm54.00mm59.30mm
TPI20181818181616161616
BSP BS2779BSP
3⁄8"1⁄2"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
Major Dia.16.66mm20.96mm26.44mm33.25mm41.91mm47.80mm59.61mm75.18mm87.88mm
TPI191414111111111111
Imperial Conduit BS31ET5⁄8"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
Major Dia.15.88mm19.05mm25.40mm31.75mm38.10mm50.80mm63.50mm76.20mm
TPI1816161614141414
THREAD FORM COMPARISON CHART
Note 1: PF Thread Form (Japan) = BSP ParallelG Thread Form (Europe) = BSP ParallelGK Thread Form (Europe) = BSP Taper
Note 2: NPT/BSPT Taper @ 1⁄16 on Major Dia.
ISO Metric – 1.5mm PitchMetricM16M20M25M32M40M50M63M75M90M100
Major Dia.15.97mm19.97mm24.97mm31.97mm39.97mm49.97mm62.97mm74.97mm89.97mm99.97mm
TPI16.9316.9316.9316.9316.9316.9316.9316.9312.7012.70
MetricM16M20M25M32M40M50M63M75M90M100
NPT3⁄8"1⁄2"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
31⁄2"
PG7, 9, 1113.5, 16PG21PG29PG36PG42PG48
BSP3⁄8"1⁄2"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
ET5⁄8"3⁄4"1"
11⁄4"11⁄2"2"
21⁄2"3"
Thread Conversion Specialists