JIC vs ORB Fittings: 37° Flare vs O-Ring Boss: Sealing, Threads, and When to Use Each

JIC makes metal-to-metal contact on a 37° cone flare, joining hose and tube ends. ORB, by contrast, relies on an elastomeric O-ring squeezed inside a straight-thread port. Both rely on straight UN/UNF threads, but don't mistake that for compatibility. You can't thread one directly into the other; a JIC-to-ORB adapter has to bridge the two.

On this page, "JIC" and "ORB" refer to fluid-system tube and hose end connections. JIC is the 37° flare fitting, per SAE J514. ORB is the SAE straight-thread O-ring boss port, per SAE J1926. Don't confuse either one with the automotive 45° SAE flare, and don't confuse "ORB" here with unrelated acronyms used outside fluid power.

JIC vs ORB at a Glance: 37° Flare vs O-Ring Boss Comparison

JIC and ORB rank among the most common hydraulic fitting types, so it's no surprise the question "JIC vs ORB" (or "ORB vs JIC", depending on how someone phrases it) comes up on nearly every build where a line has to meet a component port. Crestflo stocks both end types across its instrumentation tube fittings range. The two connections differ in one decisive way: JIC seals by pressing metal against metal at a 37° flare seat, while ORB seals by squeezing an O-ring against the flat face of a component port. Everything else follows from that: reusability, vibration tolerance, and where each one belongs in a system. The table below puts them side by side. Values reflect standard, published fitting-standard facts, and they're customizable to your requirements.

Also Known As: JIC and ORB Designations and Synonyms

Both connections go by several names, depending on the catalog, the drawing, or who's talking on the shop floor. JIC shows up as the JIC fitting, JIC thread, JIC 37°, 37 degree flare fitting, 37° cone flare, Joint Industry Council fitting, SAE 37° flare, or just "flare fitting." Its dimensional standard is SAE J514, and it traces back to the same lineage as the AN 37° flare used in aerospace work. ORB, meanwhile, gets called the O-ring boss, SAE ORB, SAE straight-thread O-ring port, boss seal, or "port fitting," with SAE J1926 as its governing standard. Knowing these aliases isn't just trivia. A request for a "37 flare" and a request for a "J514 male" point to the exact same JIC end. Ask for an "O-ring boss" or a "J1926 port," and you're asking for the same ORB connection either way.

What Is a JIC (37° Flare) Fitting?

A JIC fitting is a straight-thread connection that seals metal-to-metal on a 37° cone flare. That flare is the defining feature of the Joint Industry Council standard, codified as SAE J514. The male JIC carries a 37° flare seat machined behind a straight UN/UNF thread; the female JIC has a matching 37° inverted cone. Draw the two together and torque them down, and the flare seats press against each other to form the seal. The thread's job is purely mechanical, holding things together; the flare does the sealing. You'll find JIC ends connecting hose ends and tubing runs throughout hydraulic and instrumentation systems. Geometrically, the JIC 37° flare matches the ISO 8434-2 37° flare family, and that family is the basis for Crestflo's flare fittings. For product routes, see 37° JIC flare fittings and JIC-37 tube fittings.

What Is an ORB (O-Ring Boss) Fitting?

ORB stands for O-Ring Boss: a straight-thread port connection (SAE J1926) that seals by compressing an elastomeric O-ring against the flat face of the port boss, not against the threads. A male ORB fitting carries a straight UN/UNF thread with an O-ring held behind a back-up washer. Thread it into the machined boss on a component, bottom it against the port face, and the O-ring squeezes shut. Joint closed. Because the seal itself is a replaceable elastomer, an ORB connection handles vibration and thermal cycling well, and you can remake it many times over by fitting a fresh O-ring. ORB ends turn up at component ports: pump housings, valve bodies, hydraulic cylinders, manifold blocks. Pick the O-ring compound to match service temperature and media; see seal material by temperature. For the product route, check SAE-ORB tube fittings.

How JIC and ORB Seal: Metal-to-Metal Flare vs Elastomer O-Ring

In a JIC joint, two metal cones (the 37° flare and its seat) get forced together to form a seal. That means seal quality rides on the condition of the flare surface and on hitting the correct assembly torque. Over-torque the flare, under-torque it, or scratch the seat, and it'll leak. An ORB joint works differently: the O-ring deforms against the port face, and the rubber soaks up minor surface flaws, rides out vibration, and re-seats every time you renew it. That's why ORB tends to be the more forgiving, more vibration-tolerant connection, while a metal flare stays sensitive to how well it's installed. It's also why ORB gets the nod at leak-critical ports, whereas JIC remains the workhorse at hose and tube ends.

Are JIC and ORB Threads the Same? Straight UN/UNF Thread Reference

Both JIC and ORB fittings use straight (parallel) UN/UNF threads, and for a given dash size the nominal thread can look identical. A JIC male and an ORB male in the same dash often share the same thread callout. Here's the point that actually matters: the seal location is different. On a JIC, the seal sits at the flare seat. On an ORB, it's the O-ring pressing against the port face. That's why a JIC male won't seal in an ORB port, and an ORB male won't seal against a JIC flare, even when the threads happily engage. The table below shows where each connection seals and what it seals against, with NPT and O-ring face seal (ORFS) included for comparison.

Both come in male and female versions: a male JIC fits into a female JIC, while a male ORB threads into a female boss port that's been machined internally. If you're holding an end and can't identify it, check the thread identification guide or run it through the thread identifier tool.

JIC and ORB Dash Sizes: Tube OD and UN/UNF Thread Chart

JIC and ORB fittings both use the SAE dash sizing system. The dash number gives the tube's outside diameter in sixteenths of an inch, so -08 works out to 8/16", or 1/2" tube OD. For any given dash size, the JIC flare and the ORB port share the same nominal UN/UNF straight thread. The dimensions listed below come straight from the published SAE standard. They're not set in stone, though; they can be adjusted to fit specific requirements.

See how the dash and thread callouts line up with metric and fractional tube sizing? That's covered in metric vs imperial tube fittings.

How to Connect JIC to ORB: Adapters and Assembly

You don't thread a JIC end straight into an ORB port. Neither one will seal against the other. Instead, use a JIC-to-ORB adapter: the ORB end screws into the component boss and seals on its O-ring, and the JIC end presents a 37° flare to take the hose or tube line. Each end of the adapter carries one standard connection, a male ORB to male JIC, for example, so the port keeps its O-ring seal while the line keeps its flare seal. That's the standard, leak-free way to bring a JIC hose or tube run onto an ORB component port.

When to Choose JIC vs ORB: Port vs Hose End Decision Guide

The rule of thumb for choosing between flare and boss is simple: put ORB at the component port, and use JIC on the hose or tube run. ORB wins whenever a joint is leak-critical, faces vibration, or gets opened and remade often. The O-ring re-seats every time and soaks up vibration, and that's why component manufacturers machine ORB ports into pumps, valves, and manifolds. JIC handles the everyday work of connecting hose ends and tube ends, since its metal flare produces a joint that's tough, easy to find in stock, and simple to inspect. Here's the trade-off worth weighing honestly: a JIC flare seat is metal-to-metal, so it demands correct torque and can gall or wear after repeated reassembly. It also tolerates vibration less well than an O-ring seal. So when leak integrity under vibration matters most, an O-ring-based connection is the better bet.

JIC and ORB vs NPT and BSPP: Straight vs Tapered Threads

JIC and ORB are both straight-thread connections, and that's what separates them from NPT. NPT is a tapered pipe thread that seals on the thread flanks with a sealant. So even when the callouts look alike, an NPT thread and an ORB thread aren't the same thing and won't interchange. ORB isn't the same as BSPP either. Both are straight, parallel threads, sure, but the thread forms and pitches differ, so they won't intermate, and ORB follows SAE J1926 sizing. The safe rule is simple: match the connection to its own standard. Never assume a straight thread and a tapered thread, or two different straight-thread families, will seal together just because the size label matches.

For the tapered-versus-parallel pipe-thread detail, Crestflo's guides cover it well: see NPT vs BSP threads and NPT vs NPTF dryseal.

JIC and ORB vs ORFS (O-Ring Face Seal)

The ORFS fitting (O-ring face seal, SAE J1453) works by squeezing an O-ring, seated in a groove on the flat end face of a tube or hose fitting, against a flat mating face. Engineers often pick it over a flare when the tube or hose end needs the highest leak integrity under vibration. Here's the distinction worth remembering: ORB is a port seal, with the O-ring sealing inside a component boss, while ORFS seals at the tube or hose end, with the O-ring sitting on a flat face between two line ends. JIC, by contrast, is the metal-flare alternative to ORFS for tube and hose ends. For more on the O-ring face seal family, see face-seal fittings.

Don't Confuse JIC 37° with the SAE 45° Flare

JIC is a 37° flare per SAE J514. The SAE 45° flare (SAE J512), common in automotive and refrigeration work, uses a different angle entirely. A 37° flare won't seal against a 45° flare, and the two must never be mated, even when the nominal size matches, the cone angles don't line up, so the seats can't seal. Check the flare angle before you assemble anything. For the 45° family, see 45° SAE flare fittings, and for the wider selection, the flare fittings range covers both.

JIC and ORB Governing Standards: SAE J514, J1926 and ISO 8434-2

SAE standards define the two connections, and related standards cover the alternatives named above for contrast. The mini-table shows what each standard covers, and why it's relevant here. Standard editions apply. Values can be tailored to whatever the requirement calls for.

For the wider standards library, see instrumentation fitting standards.

JIC and ORB in Stainless, High-Nickel and CRA Alloys

Most hydraulic-catalog JIC and ORB fittings come in carbon steel. Crestflo offers both end types across a stainless, high-nickel, and corrosion-resistant-alloy menu instead, and that's the alloy-aware angle that matters for chloride, sour, and high-temperature service. Standard grades run from 316/316L through 904L, Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN, and Alloy 20, then up to the Inconel, Incoloy, Monel, and Hastelloy nickel alloys, Nickel 200/201, and Titanium Gr2. The choice climbs the menu as the service gets tougher: duplex and 6Mo for chloride-bearing and offshore duty, high-nickel alloys for sour or high-temperature media. Check the 316/316L material page, the full fitting materials library, material selection by service, and sour-service (NACE) selection.

Why Source JIC & ORB Fittings from Crestflo

Crestflo manufactures instrumentation fittings and valves, machining both JIC-37 and SAE-ORB end connections to spec. That's the point. This comparison comes from the shop that actually cuts the flare and the boss thread, not a reseller. The 37° flare fittings are built per ISO 8434-2, in end connections up to 2" (50 mm) OD, rated to 15,000 PSI and 350°C, NACE-compliant, and they combine with compression fittings. SAE-ORB ends come in the same alloy range; the O-ring compound and exact rating get specified to your service on the RFQ. Every part carries a heat-number mark under the EN 10204 3.1 material test certification standard, with 3.2 available on request. Crestflo's compression tube fittings are performance-qualified to ASTM F1387 for drop-in interchange. The company is the instrumentation division of a four-decade-old export house recognized by the Government of India, certified to ISO 9001, 14001, and 45001, plus PED. Product is of Indian origin, though US or European melt is available on request, with full material traceability. Standard items ship from stock; specials are made to order, and delivery runs 6 to 8 weeks. We Engineer Confidence.

Need JIC-37 or SAE-ORB fittings in stainless or a high-nickel alloy? Request a quote, or ask for a sample to check the fit first.

• Request a quote, JIC-37 & SAE-ORB in any alloy
• Request a sample
• JIC-37 tube fittings · SAE-ORB tube fittings · 37° JIC flare fittings

The Crestflo Engineering Team reviewed this document. Reach the US office at sales@crestflousa.com, call +1 346 594 9005, or find us in Houston, TX.

Frequently Asked Questions: JIC vs ORB

Related Resources

• JIC vs DIN 2353 (24° bite-type)
• NPT vs BSP threads
• NPT vs NPTF dryseal
• Thread identification guide
• Metric vs imperial tube fittings
• Seal material by temperature
• 37° JIC flare fittings · 45° SAE flare fittings · JIC-37 tube fittings · SAE-ORB tube fittings
• Instrumentation resources hub

Reviewed by the Crestflo Engineering Team