What is the difference between BSP and BSPT threads?

BSP (G thread, ISO 228) is parallel (straight) and uses a gasket or O-ring for sealing. BSPT (R thread, ISO 7) is tapered at 1:16 (55° Whitworth form) and seals by thread interference, often with PTFE tape.

What is the thread angle for BSP threads?

BSP threads use the Whitworth thread form with a 55° included angle, rounded crests and roots. This differs from NPT threads which use a 60° angle.

Are BSP and NPT threads interchangeable?

No, BSP and NPT are not compatible. BSP uses a 55° thread angle while NPT uses 60°. The OD values and TPI are different for most sizes. Adapters are required to connect between systems.

How do I identify BSP thread size?

Measure the OD of the male thread and count TPI (threads per inch). Then match to the BSP table. For example, ~20.9 mm OD with 14 TPI = G½. Note: BSP sizes refer to the bore of the pipe, not the thread OD.

What PTFE tape should I use on BSPT threads?

Use standard PTFE tape (0.1 mm thick, 12 mm wide) for water and air. For gas, use yellow gas-rated PTFE tape or liquid thread sealant. Apply 3–5 wraps in the tightening direction.

Ferramenta de Engenharia Gratuita — #150

Conversor de Roscas de Tubo — BSP / BSPT

Referência de roscas de tubo ISO 228 (G paralela) e ISO 7-1 (R cônica). Selecione o tamanho da rosca para visualizar OD, TPI, passo e broca para tarugos.

ISO 228ISO 7-1BSP / BSPTWhitworth 55°

Dados da Rosca

Designação da Rosca

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OD Maior (mm)

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TPI (Roscas/pol)

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Passo (mm)

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Broca para Tarugos — Paralela (mm)

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Broca para Tarugos — Cônica (mm)

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Diâmetro	DE (mm)	TPI	Passo (mm)	Broca G (mm)	Broca R (mm)

⚠️ Nota: Os tamanhos das brocas para tarugos são apenas para orientação. O furo piloto real pode variar conforme o material. Para roscas cônicas, a broca cria um furo reto; a conicidade é cortada pelo tarugo em si.

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