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.

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管螺紋轉換器 — BSP / BSPT

ISO 228 (G 平行) 與 ISO 7-1 (R 錐度) 管螺紋參考資料。選擇螺紋尺寸以查看 OD、TPI、螺距及攻牙鑽頭。

ISO 228ISO 7-1BSP / BSPT55° 惠氏螺紋

螺紋資料

螺紋標稱

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大徑 OD (mm)

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TPI (每吋牙數)

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螺距 (mm)

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攻牙鑽頭 — 平行 (mm)

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攻牙鑽頭 — 錐度 (mm)

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尺寸	OD (mm)	TPI	螺距 (mm)	G 型鑽頭 (mm)	R 型鑽頭 (mm)

⚠️ 注意： 攻牙鑽頭尺寸僅供參考。實際導鑽孔徑可能因材質而異。對於錐度螺紋，鑽頭鑽出的是直孔；錐度由絲攻本身切削而成。

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BSP/BSPT 管螺紋轉換器 — ISO 228 / ISO 7 工具

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