NPSM Swivel Female x SAE O-Ring Boss Male 45° Compact Elbow

Screws into an SAE straight-thread boss and presents a re-breakable NPSM swivel at 45°. Useful where a gauge, sensor or short line has to come off regularly and the port is O-ring boss.

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

• NPSM Swivel Female – ANSI B1.20.1 straight pipe thread with a 60° internal cone. It seals on the cone seat rather than the thread, so it must not be taped.
• SAE O-Ring Boss Male (UNO/UNF) – SAE J1926 / ISO 11926 straight thread O-ring boss. It seals on an O-ring squeezed against the port spotface, not on the thread.

How to Choose

• Two straight-thread ends with two different seals: an O-ring at the boss and a 60° cone at the swivel. Neither one wants tape.
• Match the ORB thread to the port and the NPSM to the mating male. They are commonly different sizes on the same fitting.
• Confirm the boss has a spotface. Without one the O-ring has nothing flat to seal against.

Where You’ll Find It

• NPSM Swivel Female – Gauges, filter heads, sensors and return lines where the joint has to come apart regularly.
• SAE O-Ring Boss Male (UNO/UNF) – Cylinder end caps, pump and valve bosses on US-built plant. Common on Australian-assembled cylinders too, where it is usually called UNO.

Cross-Reference

• NPSM Swivel Female – ANSI B1.20.1 straight pipe thread with a 60° internal seat. Written NPSM, sometimes called an NPT swivel.
• SAE O-Ring Boss Male (UNO/UNF) – SAE J1926 / ISO 11926 straight thread O-ring boss. Also written ORB, SAE ORB or UNO. Thread form is UN/UNF.

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.

Technicians Advice

Because neither end is tapered, a leak here is almost always a damaged O-ring or a scored cone rather than not enough torque. Pull it apart and look before reaching for a bigger spanner, since more torque on a straight thread only damages the port.

📐Dimensions & thread sizes – every size in this range

← Swipe the table sideways to see every measurement →

Part code	A	B	Material	Finish
NSF-UNM-45C-0614	7/8" UNO	3/8" NPT	Mild steel	Plated finish
NSF-UNM-45C-0814	7/8" UNO	3/8" NPT	Mild steel	Plated finish

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)

Same Threads, Other Angles

🔗 Straight – same threads🔗 90° Compact – same threads

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