SAE ORB Fittings

The SAE straight thread O-ring boss seals at the mouth of the port, not along the thread. An O-ring sits between the shoulder of the stud end and a machined spotface around the port opening; the parallel UN/UNF thread only draws the two together until that ring is squeezed. How far the fitting goes in has no bearing on whether it seals.

That independence is the point. The adjustable form adds a lock nut and washer, so an elbow can be run in, rotated to face wherever the line goes, and locked there — a freedom no tapered thread offers. SAE J1926 and ISO 11926 set the thread, spotface and O-ring dimensions, making this the default port on pumps, valves and manifolds built in North America. It does demand a machined port face: a rough spotface leaks however hard the fitting is pulled up.

Where it's specified

• Pump, motor and valve ports — the connection those components are already tapped for
• Elbows that must point a set way — the adjustable stud end clocks and locks, no guessing at thread turns
• Manifold blocks — ports are drilled and spotfaced in one setup, each sealing on its own face
• Ports opened repeatedly — a straight thread neither wears nor buries itself deeper with each remake

Range and materials. Adjustable and rigid stud ends, straights, elbows, tees, run tees, plugs and caps, plus adapters to JIC 37°, ORFS, NPT, BSP or metric, in thread sizes from -2 to -32. Carbon steel with zinc plating, 316 stainless and brass are all stocked.

Ordering notes. Choose adjustable or rigid first: rigid is cheaper and shorter, adjustable earns its keep wherever outlet direction matters. Fit the O-ring dry, run the stud down until the washer touches the spotface, back off to aim the outlet, then torque the lock nut. Metric ISO 6149 ports look similar and will not interchange, so confirm the thread before ordering.