BSP Tapered Male x Tubeweld Female Straight Weld-On Adaptor

A BSP tapered male one end and a plain weld socket the other. Threads into a BSPT port and welds onto the tube.

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

Watch: Exploring Hydraulic Adaptors Part 1: Difference Between Branch Tee & Run Tee, Elbows Short and Long

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.
• Tubeweld Female (weld-on socket) – plain-bore socket sized to a tube OD, joined by welding rather than a thread. It has no seal of its own – the weld is the joint, so the tube must be clean, square and correctly prepared.

How to Choose

• Sized by tube outside diameter, not by thread. Measure the tube with vernier calipers rather than going by what the old fitting says.
• The BSPT end seals on the thread and needs sealant. Do not put sealant anywhere near the weld end.
• Weld it before you fit it to the machine wherever you can.

Technicians Advice

Weld quality is the joint here. Clean the tube back to bright metal, get it square in the socket, and tack it in two or three places before you run the full weld so it does not pull out of line. Pressure test before it goes back into service.

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.
• Tubeweld Female (weld-on socket) – fabricated tube runs on machinery builds, tank and reservoir plumbing, and repairs where a threaded connection is not wanted or there is no room for one.

Cross-Reference

• BSP Tapered Male – BSPT to ISO 7 / BS 21, written R for male. Sometimes labelled PT or BSP taper.
• Tubeweld Female (weld-on socket) – Weld-on socket, also called a weld nipple, weld boss or tubeweld end. Sized by tube outside diameter, not by 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-TWF-0404	1/4" BSPT	1/4" Tube	21mm	14mm	Mild steel	Plated finish
BTM-TWF-0406	1/4" BSPT	3/8" Tube	21mm	14mm	Mild steel	Plated finish
BTM-TWF-0604	3/8" BSPT	1/4" Tube	25mm	19mm	Mild steel	Plated finish
BTM-TWF-0606	3/8" BSPT	3/8" Tube	25mm	19mm	Mild steel	Plated finish
BTM-TWF-0608	3/8" BSPT	1/2" Tube	25mm	19mm	Mild steel	Plated finish
BTM-TWF-0808	1/2" BSPT	1/2" Tube	31mm	22mm	Mild steel	Plated finish
BTM-TWF-0810	1/2" BSPT	5/8" Tube	31mm	22mm	Mild steel	Plated finish
BTM-TWF-0812	1/2" BSPT	3/4" Tube	31mm	24mm	Mild steel	Plated finish
BTM-TWF-1212	3/4" BSPT	3/4" Tube	31mm	30mm	Mild steel	Plated finish
BTM-TWF-1216	3/4" BSPT	1" Tube	37mm	30mm	Mild steel	Plated finish
BTM-TWF-1616	1" BSPT	1" Tube	35mm	36mm	Mild steel	Plated finish
BTM-TWF-1620	1" BSPT	1.1/4" Tube	36mm	38mm	Mild steel	Plated finish
BTM-TWF-2020	1.1/4" BSPT	1.1/4" Tube	38mm	46mm	Mild steel	Plated finish
BTM-TWF-2424	1.1/2" BSPT	1.1/2" Tube	42mm	50mm	Mild steel	Plated finish
BTM-TWF-3232	2" BSPT	2" Tube	50mm	65mm	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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