BSP Tapered Male x NPT Tapered Female Straight Adaptor

BSPT male one end, NPT tapered female the other. The joiner for where American-built gear meets an Australian machine and neither thread will take the other.

Brand: Ayrtec – mild steel body with a plated finish, manufactured to the standards listed below.

Watch: How to Identify Hydraulic Hose Fittings and Hydraulic Adaptors JIC and BSP

Thread Standards

• BSP Tapered Male – BSPT to ISO 7 / BS 21. It seals on the tapered thread itself, so it needs PTFE tape or a liquid thread sealant.
• NPT Tapered Female – ANSI/ASME B1.20.1 tapered pipe thread. It seals on the thread and needs tape or sealant every time.

How to Choose

• Both ends seal on the thread, so both need sealant. Anaerobic sealant or PTFE tape wound the way the thread turns.
• BSPT is a 55° Whitworth form, NPT is 60°. They will start together and feel right for a turn or two, then tear.
• Do not go by the number on the port. 1/2" BSPT and 1/2" NPT are different pitches.

Technicians Advice

Keep tape back off the first two threads. Started on the leading thread it unravels as it goes in and the tail ends up loose in the circuit, and shredded PTFE in a valve spool is a much longer day than a weeping adaptor.

Where You’ll Find It

• BSP Tapered Male – Older Australian and British pipework, gauge ports, tank and return lines, and cast pump and gearbox housings.
• NPT Tapered Female – Female side of American pipework, adaptor blocks and gauge manifolds.

Cross-Reference

• BSP Tapered Male – BSPT to ISO 7 / BS 21, written R for male. Sometimes labelled PT or BSP taper.
• NPT Tapered Female – ANSI/ASME B1.20.1 tapered pipe thread.

Parker, Gates, Aeroquip and Ryco all manufacture to these same standards under their own part numbering, so a fitting built to the standard above will mate with theirs.

Cross-references are given at series level as a guide to the standard, not as a part-for-part substitution. Always confirm the thread form, size and seal type against the port before ordering.

📐Dimensions & thread sizes – every size in this range

← Swipe the table sideways to see every measurement →

Part code	A	B	L	H1	Material	Finish
BTM-NTF-0202	1/8" BSPT	1/8" NPT	26mm	14mm	Mild steel	Plated finish
BTM-NTF-0404	1/4" BSPT	1/4" NPT	37mm	19mm	Mild steel	Plated finish
BTM-NTF-0606	3/8" BSPT	3/8" NPT	37mm	22mm	Mild steel	Plated finish
BTM-NTF-0808	1/2" BSPT	1/2" NPT	49mm	27mm	Mild steel	Plated finish
BTM-NTF-1212	3/4" BSPT	3/4" NPT	51mm	36mm	Mild steel	Plated finish
BTM-NTF-1616	1" BSPT	1" NPT	60mm	41mm	Mild steel	Plated finish

Key: L overall length, H1 centre to face 2. Measurements in millimetres unless shown otherwise. Thread columns show what each end mates with. Dimensions are nominal – check critical clearances against the part.

Downloads

📄 Thread Identification Chart (PDF)

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