O-Ring Boss Fittings

Q: How do I choose the right ORB to ORB fitting for my project?

Identify the ORB dash size and thread pitch of both ports first. Then choose either an equal size connector or an ORB reducer that matches both ends. Also confirm that both mating ports are female SAE O-ring boss ports with the correct machined sealing surface. The Evil Energy swivel ORB to ORB fitting is offered in 6 ORB to 6 ORB, 6 ORB to 8 ORB, 8 ORB to 8 ORB, 8 ORB to 10 ORB, 10 ORB to 10 ORB and 10 ORB to 12 ORB options. Do not select a fitting by hose outside diameter or thread engagement alone.

Q: Are AN, JIC and ORB fittings interchangeable?

No. AN and JIC fittings seal at a 37 degree flare, while ORB fittings seal with an O-ring against the machined face of an ORB port. Some corresponding sizes use the same thread diameter and pitch, so an AN fitting may appear to screw into an ORB port, but that does not make the sealing methods interchangeable. Use a purpose-built AN to ORB adapter fitting when connecting an AN hose end to an ORB port. The applicable inch-thread ORB port dimensions are defined by SAE J1926/1 .

Q: Should I choose a straight, 45 degree or 90 degree ORB adapter?

Choose a straight ORB adapter when the hose naturally aligns with the port and there is enough room for assembly tools. A 45 degree ORB fitting can create a gradual direction change, while a 90 degree ORB fitting is useful where a straight connection would force the hose into a tight bend or nearby component. Before ordering, check hose routing, hex clearance, swivel clearance and access for tightening. The angle helps solve packaging problems, but it does not change the required port size or sealing type.

Q: Should I use PTFE tape on ORB fittings, and can they be reused?

Do not apply PTFE tape to the ORB thread . The O-ring creates the seal; the straight threads retain the fitting. Tape can prevent correct seating and may introduce debris into a fuel or oil system. Before assembly, inspect the O-ring and apply only a light coating of lubricant that is compatible with the system fluid and seal material. ORB fittings can be disconnected and reassembled, but the O-ring should be replaced if it is cut, flattened, hardened or swollen. Tighten according to the component or fitting manufacturer’s specification and inspect the connection under operating pressure.

Shop Evil Energy ORB fittings for connecting AN plumbing to O-ring boss ports on fuel rails, fuel pumps, fuel filters, fuel pressure regulators and oil coolers. These O-ring boss fittings seal at the O-ring against the machined port face, while the straight threads hold the connection in place. Before ordering, identify the connection on both ends, the ORB port size, the AN line size and the available installation space.

How to Choose the Right ORB Fitting

Start with the component port, not the hose diameter. Confirm that the port is an SAE ORB port, then match its dash size and thread pitch. Next, choose the opposite end required by your plumbing: male AN flare, female AN flare or an ORB to ORB fitting. AN and ORB connections can share a thread size, but they do not use the same sealing surface, so thread engagement alone does not confirm compatibility.

Route AN to ORB Fittings in Tight Engine Bays

Choose a straight AN to ORB fitting when the hose can approach the port without interference. Use a 45° or 90° ORB adapter fitting when a direct route would force a tight hose bend or contact nearby components. Evil Energy offers compact fuel adapter fittings for common performance plumbing layouts. Complete the connection with the matching AN fittings, and verify the port thread, fitting gender, angle, working pressure and fluid compatibility for the selected part before installation.

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FAQs about O-Ring Boss Fittings

How do I choose the right ORB to ORB fitting for my project?

Identify the ORB dash size and thread pitch of both ports first. Then choose either an equal size connector or an ORB reducer that matches both ends. Also confirm that both mating ports are female SAE O-ring boss ports with the correct machined sealing surface.

The Evil Energy swivel ORB to ORB fitting is offered in 6 ORB to 6 ORB, 6 ORB to 8 ORB, 8 ORB to 8 ORB, 8 ORB to 10 ORB, 10 ORB to 10 ORB and 10 ORB to 12 ORB options. Do not select a fitting by hose outside diameter or thread engagement alone.

Are AN, JIC and ORB fittings interchangeable?

No. AN and JIC fittings seal at a 37 degree flare, while ORB fittings seal with an O-ring against the machined face of an ORB port. Some corresponding sizes use the same thread diameter and pitch, so an AN fitting may appear to screw into an ORB port, but that does not make the sealing methods interchangeable.

Use a purpose-built AN to ORB adapter fitting when connecting an AN hose end to an ORB port. The applicable inch-thread ORB port dimensions are defined by SAE J1926/1.

How do I determine the size of an O-ring boss fitting?

Check the port documentation first, then measure the major thread diameter and verify the thread pitch with a thread gauge. Common sizes include 4 ORB with 7/16-20 UNF, 6 ORB with 9/16-18 UNF, 8 ORB with 3/4-16 UNF, 10 ORB with 7/8-14 UNF and 12 ORB with 1-1/16-12 UNF.

The dash number is a nominal size designation, not the measured thread diameter. Always match the complete size and thread specification rather than relying on the “AN” or “ORB” number alone.

Should I choose a straight, 45 degree or 90 degree ORB adapter?

Choose a straight ORB adapter when the hose naturally aligns with the port and there is enough room for assembly tools. A 45 degree ORB fitting can create a gradual direction change, while a 90 degree ORB fitting is useful where a straight connection would force the hose into a tight bend or nearby component.

Before ordering, check hose routing, hex clearance, swivel clearance and access for tightening. The angle helps solve packaging problems, but it does not change the required port size or sealing type.

Should I use PTFE tape on ORB fittings, and can they be reused?

Do not apply PTFE tape to the ORB thread. The O-ring creates the seal; the straight threads retain the fitting. Tape can prevent correct seating and may introduce debris into a fuel or oil system.

Before assembly, inspect the O-ring and apply only a light coating of lubricant that is compatible with the system fluid and seal material. ORB fittings can be disconnected and reassembled, but the O-ring should be replaced if it is cut, flattened, hardened or swollen. Tighten according to the component or fitting manufacturer’s specification and inspect the connection under operating pressure.

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