SAE O-Ring Boss Male x SAE O-Ring Boss Male 90° Compact Elbow

O-ring boss at both ends in a 90° body, for joining two SAE straight-thread bosses or turning between two boss ports on American-built plant.

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

Watch: 90 ° Hydraulic Adaptors How They Work and the Importance of O'Rings

Thread Standards

• 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

• Both ends need a machined boss with a spotface. Neither will seal in a tapered port.
• Unequal sizes are stocked, so check the thread at each port rather than assuming they match.
• Two O-rings, both consumable, and both must suit the fluid.

Technicians Advice

Two boss O-rings means two chances to pinch one. Lubricate both with clean system oil, check both spotfaces for burrs, and wind each in until the O-ring just touches before nipping up. Neither end wants heavy torque.

Where You’ll Find It

• 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

• 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.

📐Dimensions & thread sizes – every size in this range

← Swipe the table sideways to see every measurement →

Part code	A	B	Material	Finish
UNM-UNM-90C-0912	9/16" UNO	3/4" UNO	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

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