UNO O-Ring Boss Female x UNO O-Ring Boss Male Straight Adaptor

SAE O-ring boss female one end, UNO male the other. The UNO extension and size-change piece, used to bring a UNO port out or step between UNO sizes on American-built gear.

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

• UNO O-Ring Boss Female (UNF) – SAE J1926 / ISO 11926 straight thread O-ring boss, female. It takes a UNO male whose O-ring seals against the spotface inside the port, never on the thread.
• 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

• The male end seals on its O-ring at the port spotface. The female end takes a male that does the same inside it.
• No sealant on either thread. Both ends work on a soft seal.
• A UNO male will start into a BSPP port and strip. Check the full callout before you wind it in.

Technicians Advice

Wind the male end in until the O-ring just kisses the spotface then take it the specified turn and stop. Past that the ring extrudes out the side, and the leak looks like a thread fault when it is a torque fault.

Where You’ll Find It

• UNO O-Ring Boss Female (UNF) – American-built pumps, motors, valve banks and cylinders – Eaton, Parker, Sauer-Danfoss, Vickers – and anything built to SAE port standards. Common on skid steers, telehandlers and US-sourced attachments.
• 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

• UNO O-Ring Boss Female (UNF) – SAE J1926-1 / ISO 11926 straight thread O-ring boss. Often written UNO, UN/UNF or SAE ORB. Parker call it Triple-Lok on the port side. Not the same as a JIC 37° female even where the thread size matches.
• 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	L	H1	Material	Finish
UNF-UNM-0709	9/16" UNO	7/16" UNO	31mm	20.6mm	Mild steel	Plated finish
UNF-UNM-0712	3/4" UNO	7/16" UNO	34mm	27.0mm	Mild steel	Plated finish
UNF-UNM-0714	7/8" UNO	7/16" UNO	40mm	28.6mm	Mild steel	Plated finish
UNF-UNM-0907	7/16" UNO	9/16" UNO	31mm	20.6mm	Mild steel	Plated finish
UNF-UNM-0912	3/4" UNO	9/16" UNO	35mm	27.0mm	Mild steel	Plated finish
UNF-UNM-0914	7/8" UNO	9/16" UNO	40mm	28.6mm	Mild steel	Plated finish
UNF-UNM-0917	1.1/16" UNO	9/16" UNO	44mm	34.9mm	Mild steel	Plated finish
UNF-UNM-1212	3/4" UNO	3/4" UNO	37mm	27.0mm	Mild steel	Plated finish
UNF-UNM-1214	7/8" UNO	3/4" UNO	40mm	28.6mm	Mild steel	Plated finish
UNF-UNM-1217	1.1/16" UNO	3/4" UNO	44mm	34.9mm	Mild steel	Plated finish
UNF-UNM-1221	1.5/16" UNO	3/4" UNO	45mm	41.3mm	Mild steel	Plated finish
UNF-UNM-1230	1.7/8" UNO	3/4" UNO	50mm	63.5mm	Mild steel	Plated finish
UNF-UNM-1417	1.1/16" UNO	7/8" UNO	45mm	34.9mm	Mild steel	Plated finish
UNF-UNM-1421	1.5/16" UNO	7/8" UNO	45mm	41.3mm	Mild steel	Plated finish
UNF-UNM-1714	7/8" UNO	1.1/16" UNO	45mm	34.9mm	Mild steel	Plated finish
UNF-UNM-1721	1.5/16" UNO	1.1/16" UNO	48mm	41.3mm	Mild steel	Plated finish
UNF-UNM-1726	1.5/8" UNO	1.1/16" UNO	49mm	54.0mm	Mild steel	Plated finish
UNF-UNM-1730	1.7/8" UNO	1.1/16" UNO	50mm	63.5mm	Mild steel	Plated finish
UNF-UNM-2126	1.5/8" UNO	1.5/16" UNO	50mm	54mm	Mild steel	Plated finish
UNF-UNM-2130	1.7/8" UNO	1.5/16" UNO	50mm	63.5mm	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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