A variety of heavy-duty, zinc-plated carbon steel SAE O-Ring Boss fittings, engineered for high-pressure hydraulic systems.

Steel SAE O-Ring Boss (ORB) Fittings | Wholesale & OEM Supply

Q: What's the difference between ORB and NPT threads?

ORB (O-Ring Boss) uses straight threads for mechanical strength and a dedicated O-ring for a superior, leak-proof seal. NPT (National Pipe Taper) relies on tapered threads deforming into each other, which is prone to leaks. ORB is the modern, more reliable standard for high-pressure port connections.

Q: Are JIC and ORB threads the same? Can they connect?

While they often share the same thread size (e.g., 3/4"-16), their sealing methods are completely different. JIC seals on a 37° metal-to-metal flare, while ORB uses an O-ring. They are not interchangeable and cannot create a seal without a proper adapter.

Q: When should I choose ORB over ORFS fittings?

Use ORB for connecting a fitting into a port (e.g., on a pump or valve). Use ORFS (O-Ring Face Seal) for connecting two tube or hose ends to each other, especially in high-vibration systems. ORB seals ports; ORFS connects lines.

Q: Do I need sealant or Teflon tape on ORB fittings?

Absolutely not. The O-ring performs 100% of the sealing. Adding tape or sealant is unnecessary and can contaminate the hydraulic system.

The Industry Standard for a Reason: It Just Works.

For When You're Done Chasing Leaks.

Let's be blunt. Chasing a leak from a tapered pipe thread is a waste of time and money. You can crank on it, slather it with dope, and it can still weep under vibration or a pressure spike. It's a gamble. The SAE O-Ring Boss (ORB) fitting is the system that smart engineers spec'd to end that gamble for good. It's governed by the SAE J1926 rulebook for a reason: it's a brutally effective and reliable way to seal a port.

The magic is there is no magic. The straight threads provide pure mechanical clamping force. That's all they do. The real work of sealing is handled by a tough Buna-N O-ring that gets squeezed into a dedicated groove. Two separate jobs, done right. We forge these fittings from solid carbon steel - the stuff that builds tractors and presses - and then give them a tough-as-nails zinc plating right here in our own plant. For the OEM, wholesaler, or distributor, this is your inventory workhorse. It’s the reliable, leak-free connection your customers depend on, and we keep them stocked deep because we know downtime costs a hell of a lot more than a fitting.

SAE O-Ring Boss (ORB) Fitting Catalog (Steel)

37° JIC Male x SAE ORB Male Adapter

Part #: 6400

Straight adapter connecting a female JIC swivel fitting/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

37° JIC Male x SAE ORB Male Adapter Long

Part #: 6400L

Similar to 6400 but with an extended length on the ORB male end for reaching recessed ports.

SAE ORB Male x NPTF Pipe Male Adapter

Part #: 6401

Straight adapter connecting a female NPTF port to an SAE O-Ring Boss port. Male ORB x Male NPTF ends.

SAE ORB Male x 37° JIC Female Swivel Nut Adapter

Part #: 6402

Straight adapter connecting a male JIC flare fitting/tube to an SAE O-Ring Boss port. Male ORB x Female JIC Swivel ends.

SAE ORB Female x NPTF Pipe Male Adapter

Part #: 6404

Straight adapter connecting a male NPTF pipe/fitting into a female ORB threaded cavity (Note: Sealing via ORB threads not standard).

SAE ORB Male x NPTF Pipe Female Adapter

Part #: 6405

Straight adapter connecting a female NPTF pipe/fitting into an SAE O-Ring Boss port. Male ORB x Female NPTF ends.

SAE ORB Male x SAE ORB Male Union

Part #: 6407

Straight union connecting two female SAE O-Ring Boss ports of the same size. Male ORB ends.

SAE ORB Hex Head Plug

Part #: 6408 / 6408H

Seals an unused female SAE O-Ring Boss port. Features an O-ring seal and external hex head for tightening.

SAE ORB Hex Socket Plug

Part #: 6409

Seals an unused female SAE O-Ring Boss port. Features an internal hex (Allen) socket for flush or recessed installation.

SAE ORB Male x SAE ORB Female Reducer/Expander

Part #: 6410

Adapter to connect different ORB thread sizes. Male ORB x Female ORB ends, typically reducing or expanding.

SAE ORB Female x SAE ORB Female Coupler

Part #: 6425

Connects two male ORB fittings. Female ORB threads both ends. (Use limited, sealing relies on male fitting O-rings).

37° JIC Male x SAE ORB Male 90° Elbow

Part #: 6801

90° adapter elbow connecting a female JIC swivel/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

37° JIC Male x SAE ORB Male 90° Elbow Long

Part #: 6801L

Long version of the 90° JIC Male x ORB Male elbow, providing extended reach on one or both ends.

JIC Male x ORB Male 90° Elbow Extra Long

37° JIC Male x SAE ORB Male 90° Elbow Extra Long

Part #: 6801LL

Extra long version of the 90° JIC Male x ORB Male elbow for maximum reach requirements.

37° JIC Male x SAE ORB Male 45° Elbow

Part #: 6802

45° adapter elbow connecting a female JIC swivel/tube to an SAE O-Ring Boss port. Male JIC x Male ORB ends.

SAE ORB Male x NPSM Pipe Female Swivel 90° Elbow

Part #: 6901

90° adapter elbow connecting an ORB port to a male NPSM (straight pipe thread) fitting, featuring a swivel nut.

37° JIC Male x SAE ORB Male Run Tee

Part #: 6804

Tee adapter with two male ORB ends on the run and one male JIC end on the branch.

SAE ORB Male x NPTF Female 90° Elbow

Part #: 6805

90° adapter elbow connecting an ORB port to a male NPTF pipe/fitting. Male ORB x Female NPTF ends.

SAE ORB Male x NPTF Female 90° Long Elbow

Part #: 6805L

Long version of the 90° ORB Male x NPTF Female elbow for extended reach.

SAE ORB Male x NPTF Male 90° Elbow

Part #: 6806

90° adapter elbow connecting an ORB port to a female NPTF port. Male ORB x Male NPTF ends.

SAE ORB Male x SAE ORB Male 90° Elbow

Part #: 6807

90° elbow connecting two female ORB ports. Male ORB ends.

SAE ORB Male x 37° JIC Female Swivel 90° Elbow

Part #: 6809

90° adapter elbow connecting an ORB port to a male JIC flare fitting/tube. Male ORB x Female JIC Swivel ends.

SAE ORB Male x SAE ORB Female 90° Elbow

Part #: 6815

90° elbow adapter with one male ORB end and one female ORB end. (Use may be limited).

SAE ORB Male x NPTF Pipe Female Swivel Adapter

Part #: 6900

Straight adapter connecting an ORB port to a male NPTF pipe/fitting, featuring a swivel nut.

SAE ORB Male x NPSM Pipe Female Swivel 45° Elbow

Part #: 6902

45° adapter elbow connecting an ORB port to a male NPSM pipe/fitting, featuring a swivel nut.

Related Accessories

Steel Case of 288 Assorted O-Rings

Part #: 30002

Convenient assortment case containing various sizes of O-rings suitable for hydraulic adapters, including ORB fittings.

Buna N O-Ring for SAE ORB Adapters

Part #: OB1 Series

Standard Buna-N (Nitrile) O-rings specifically sized for SAE O-Ring Boss ports. Suitable for common hydraulic fluids and moderate temperatures.

Viton® O-Ring for SAE ORB Adapters

Part #: OB2 Series

Viton® (FKM) O-rings sized for SAE ORB ports, offering enhanced chemical resistance and higher temperature tolerance compared to Buna-N.

The Nuts and Bolts of the ORB System

Any guy with field experience knows a good connection is everything. The SAE J1926 O-Ring Boss standard wasn't designed in a lab; it was designed by engineers fed up with failures. Here's the no-fluff breakdown of why it's the standard for any piece of equipment that has to earn its keep.

How It Works: Muscle and a Gasket

The concept is dead simple and that's why it's brilliant. It separates the job of holding the fitting tight from the job of sealing it.

Straight Threads for Clamping: The UN/UNF threads are just for muscle. They pull the fitting down and hold it against vibration and pressure spikes. They do zero sealing. This means you can take them apart and put them back together without wrecking the seal.
The O-Ring for Sealing: A tough, 90-durometer Buna-N O-ring sits on the "shoulder" of the fitting. When you tighten it into a proper ORB port, that O-ring is compressed into a machined chamfer. It's a positive, protected seal.

What You're Really Paying For

Fewer Callbacks: This connection is designed to stop leaks. No more Monday morning puddles under a brand new machine. That saves your reputation.
Handles Real-World Pressure: We forge these from carbon steel to handle thousands of PSI day-in and day-out. They don't stretch or crack under load.
Reusable & Serviceable: Since you're not mashing threads together for a seal, you can service a line and reuse the fitting. Just check the O-ring and torque it back down.
Cleaner Systems: You don't need pipe dope or Teflon tape. That means no risk of that junk breaking loose and clogging up a valve or pump screen downstream.

The Rules of the Road (No Shortcuts)

Use the Right Port: An ORB fitting needs a proper ORB port machined to the SAE standard. You can't just drill a hole and tap it. It needs that chamfer for the O-ring to seat in.
Respect the O-Ring: That little rubber ring is the most important part of the system. Make sure it's the right size, not nicked or dried out, and has a little clean hydraulic oil on it before install. A ten-cent O-ring protects a fifty-thousand-dollar engine. Act like it.
Use a Torque Wrench: This isn't a strongman competition. Overtightening will crush the O-ring or even crack the port. Too loose, and it will leak. Use a torque wrench and get it right.

For 95% of the hydraulic jobs out there - from tractors to factory presses - zinc-plated steel ORB isn't just the economical choice; it's the right choice. It's the standard for a reason.

Straight Answers to Common ORB Questions

What's the difference between ORB and NPT threads?

ORB (O-Ring Boss) uses straight threads solely for mechanical strength and a dedicated O-ring for a superior, leak-proof seal. NPT (National Pipe Taper) relies on tapered threads deforming into each other, which is prone to leaks under vibration and pressure. ORB is the modern, more reliable standard for high-pressure port connections.

Learn more in our complete ORB Guide →

Are JIC and ORB threads the same? Can they connect?

While they often share the same thread size (e.g., 3/4"-16 for -8), their sealing methods are completely different. JIC seals on a 37° metal-to-metal flare, while ORB uses an O-ring. They are not interchangeable and cannot create a seal with each other without a proper adapter (like our Part #6400).

See our JIC vs. ORB vs. ORFS comparison →

When should I choose ORB over ORFS fittings?

Use ORB for connecting a tube or hose fitting into a port on a pump, valve, or cylinder. Use ORFS (O-Ring Face Seal) for connecting two tube or hose ends to each other, especially in high-vibration environments. ORB seals ports; ORFS connects lines.

Read our guide on high-pressure sealing choices →

Do I need sealant or Teflon tape on ORB fittings?

Absolutely not. The O-ring does 100% of the sealing. Adding tape or pipe dope is unnecessary and dangerous, as fragments can break off and contaminate your hydraulic system, leading to pump or valve failure. Simply lubricate the O-ring with clean hydraulic fluid before installation.

Understand the difference between mechanical and sealing threads →

The Workhorse Fitting Your Inventory Needs.

As a direct manufacturer, we keep these essential steel ORB adapters on the shelf and ready to move. For volume quotes and blanket orders that will actually show up on time, talk to the people who run the machines.

Get a Factory-Direct Quote See Stainless Steel Options