UNO O-Ring Boss Female x UNO O-Ring Boss Female Straight Socket

SAE O-ring boss female both ends. Joins two UNO male fittings back to back, most often seen on American-built pumps, motors and valve banks.

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.

How to Choose

• Each male going in seals on its O-ring against the spotface inside the socket, never on the thread.
• Inspect both internal spotfaces before you fit anything. A nick in there weeps past a good O-ring and is invisible once assembled.
• UNO and UNF callouts are the same family. Go by the full callout, for example 7/8-14, not the fraction alone.

Technicians Advice

Neither of these threads takes sealant and both look like they should. If it weeps, the answer is the O-ring or the spotface, not the tape tin. Oil each ring and ease it in rather than dragging it over the thread dry.

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.

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.

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	L	Hex	Material	Finish
UNF-UNF-0707	36mm	15.9mm	Mild steel	Plated finish
UNF-UNF-0909	36mm	19.1mm	Mild steel	Plated finish
UNF-UNF-1212	36mm	27.0mm	Mild steel	Plated finish
UNF-UNF-1717	47mm	34.9mm	Mild steel	Plated finish
UNF-UNF-2121	55mm	50.8mm	Mild steel	Plated finish
UNF-UNF-1414	41mm	28.6mm	Mild steel	Plated finish

Key: L overall length, Hex across flats. 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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