37° JIC Flare Fittings: Stainless Steel & Alloy (SAE J514 / ISO 8434-2)
A 37° JIC flare fitting is a metal flared tube and hose fitting that seals on a 37° cone, made to SAE J514 and ISO 8434-2. Crestflo manufactures the full line, male, female swivel, union, tee, elbow and adapter forms, in stainless steel and corrosion-resistant alloys, in both imperial and metric sizes, up to 2" (50 mm) OD, rated up to 15,000 PSI and up to 350 °C, available NACE MR0175 / ISO 15156-compliant in suitable grades. On this page, "37° JIC flare fitting" means an instrumentation- and fluid-power-grade metal flared tube fitting, not an automotive 45° inverted brake flare and not a plumbing or refrigeration flare.
What "37° JIC" Means: JIC vs AN vs SAE J514 Flare Fittings
JIC stands for Joint Industry Council, the body that standardized the 37° flare that now carries the SAE J514 and ISO 8434-2 designations. The seal is metal-to-metal: the 37° cone machined on the tube nose is drawn against the fitting's 37° seat by a UNF straight-thread nut, so the thread provides the clamping force while the flare face makes the seal. Dimensionally the 37° JIC flare shares its seat angle with the military AN (Army-Navy) flare and with SAE J514, which is why the three families interchange on the standard geometry. An AN fitting is the same 37° JIC entity carried under the Army-Navy designation, so AN fittings and JIC fittings mate on the shared 37° geometry. The differences between them lie in tolerance class, inspection regime and material pedigree rather than in the sealing angle.
| Designation | Flare / seat angle | Governing spec | Notes |
|---|---|---|---|
| JIC 37° flare | 37° | SAE J514 | Joint Industry Council standard for fluid-power and instrumentation |
| AN 37° flare | 37° | MIL / AN series | Military lineage; same 37° seat geometry |
| SAE J514 | 37° | SAE J514 | Dimensional standard for 37° flared tube fittings |
| ISO 8434-2 | 37° | ISO 8434-2 | International 37° flare series; Crestflo manufacturing basis |
Values per SAE J514 / ISO 8434-2; customizable to requirement.
Also Specified As: JIC 37° Flare, SAE J514 Flare & 37 Degree Flare Fittings
Across drawings, purchase specs and catalogs, the same fitting is written many ways. Engineers and buyers commonly specify it as a JIC fitting, a JIC 37° flare, a 37 degree flare fitting, an SAE 37° flare, an SAE J514 flare, an ISO 8434-2 (37° series) fitting, a 37° AN flare, an AN fitting (the AN 37° flare is the same 37° JIC entity), or simply a flared tube fitting. Component call-outs include male JIC connector, female JIC swivel, JIC union, JIC bulkhead, JIC tee and cross, JIC elbow (45°, 90° and long-drop), JIC cap and plug, and the JIC flare nut and sleeve. All of these designate one entity: the 37° flared connection covered on this page.
37° JIC Flare Fitting Types: Male, Female Swivel, Union, Tee, Elbow, Bulkhead
Crestflo produces the complete configuration set so a panel, hose assembly or process line can be built from a single alloy family with matched heat traceability.
| Configuration | Description | Typical use |
|---|---|---|
| Male JIC connector | External UNF straight thread, 37° flare nose | Tube-to-port terminations |
| Female JIC swivel | Captive swivel nut, 37° seat | Non-orienting hose and tube ends |
| Union | 37° flare both ends | Straight tube-to-tube joints |
| Bulkhead union | Panel-mount body with lock-nut | Through-panel pass-through |
| Tee (run / branch) | Three 37° flare ends | Line branching |
| Cross | Four 37° flare ends | Four-way distribution |
| 45° / 90° / long-drop elbow | Angled 37° flare ends; long-drop adds reach past an obstruction | Directional routing in tight envelopes |
| Cap and plug | Closes flare nut / seat | Port and line closure |
| Flare nut and sleeve | UNF nut with collar | Field make-up on flared tube |
JIC Adapters & Thread Combinations: JIC to NPT, BSPP, SAE-ORB & Metric
Adapters take a 37° JIC flare on one end and a second thread or seal standard on the other, letting a JIC line terminate into a wide range of ports. Crestflo's 37° flare fittings are also combinable with its compression tube fittings, so a flared line can transition cleanly into a double-ferrule instrumentation run.
| JIC end paired with | Offered | Second-end owner |
|---|---|---|
| NPT (tapered pipe) | ✓ | NPT thread ends |
| BSPP (parallel pipe) | ✓ | BSPP thread ends |
| BSPT (tapered pipe) | ✓ | BSPT thread ends |
| SAE-ORB (O-ring boss) | ✓ | SAE-ORB ends |
| Metric parallel | ✓ | Metric ends |
| Compression tube fitting | ✓ | Tube fittings |
JIC Fitting Sizes, Threads & Dimensions: Dash -4 to -32, UNF Straight Threads
The dash size equals the tube OD in sixteenths of an inch, and each dash carries a defined UNF straight thread under SAE J514. The JIC thread chart below pairs every dash size with its tube OD and matching UNF straight thread (7/16-20 through 1-7/8-12 and up). Crestflo supplies the range up to 2" (50 mm) OD in both imperial and metric tube sizes.
| Dash | Tube OD (in) | Tube OD (mm) | UNF straight thread |
|---|---|---|---|
| -4 | 1/4 | 6.35 | 7/16-20 |
| -5 | 5/16 | 7.94 | 1/2-20 |
| -6 | 3/8 | 9.53 | 9/16-18 |
| -8 | 1/2 | 12.70 | 3/4-16 |
| -10 | 5/8 | 15.88 | 7/8-14 |
| -12 | 3/4 | 19.05 | 1-1/16-12 |
| -14 | 7/8 | 22.23 | 1-3/16-12 |
| -16 | 1 | 25.40 | 1-5/16-12 |
| -20 | 1-1/4 | 31.75 | 1-5/8-12 |
| -24 | 1-1/2 | 38.10 | 1-7/8-12 |
| -32 | 2 | 50.80 | 2-1/2-12 |
Thread and OD values per SAE J514 / ISO 8434-2; customizable to requirement. Working pressure reaches up to 15,000 PSI and temperature up to 350 °C, with the achievable rating dependent on grade, size and service temperature, ratings per applicable standard, customizable to requirement. Because the flare joint is all-metal, the primary seal carries no elastomer. Full 37° flare fitting dimensions, including flare OD, seat and hex across-flats for each dash, are held to SAE J514 / ISO 8434-2. For the ordering-code and exact per-size dimensional schedule, request the ordering-code guide from our engineering team via the RFQ form.
37° JIC Flare Fitting Materials: 316L Stainless, Duplex, Monel & Nickel Alloys
Crestflo machines 37° JIC flare fittings across stainless, duplex and high-nickel corrosion-resistant alloys, stainless steel JIC fittings through to the material depth commodity hydraulic sellers stop short of. Offered families include 304/304L and 316/316L stainless, 904L, Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN and Alloy 20, the Inconel, Incoloy, Monel and Hastelloy nickel grades, Nickel 200/201, and Titanium Gr2.
| Family | Representative grades | Best for |
|---|---|---|
| Stainless | 316/316L, 304/304L, 904L | General instrumentation and fluid power |
| Duplex / super-austenitic | Duplex 2205, Super Duplex 2507, 254 SMO | Chloride and seawater exposure |
| Nickel alloys | Inconel 625, Inconel 825, Monel 400, Hastelloy C-276 | Sour, acidic and high-temperature media |
| Titanium | Titanium Gr2 | Light-weight, high corrosion resistance |
Crestflo offers 37° JIC flare fittings in stainless steel and corrosion-resistant alloys only, not carbon steel, brass or aluminum. Indian origin; US / European melt available on request, with full material traceability.
Standards, Certifications & Testing: ISO 8434-2, SAE J514, NACE & ASTM F1387
Crestflo manufactures 37° JIC flare fittings to ISO 8434-2 and SAE J514, and holds the standard approvals applicable to instrumentation fittings. The company is ISO 9001 / 14001 / 45001 and PED certified, with sour-service grades available NACE MR0175 / ISO 15156-compliant. Dimensional interchange with major 37° flare lines is underpinned by ASTM F1387 performance qualification.
| Item | Standard | Basis |
|---|---|---|
| Flare fitting conformance | ISO 8434-2, SAE J514 | Manufacturing standard |
| Interchange qualification | ASTM F1387 | Performance basis |
| Sour service | NACE MR0175 / ISO 15156 | Compliant grades |
| Quality systems | ISO 9001 / 14001 / 45001, PED | Certified |
| Traceability | EN 10204 MTC 3.1 (3.2 on request) | Heat / lot number on every part |
Every part carries a heat or lot number for full material traceability, and testing covers hydraulic proof, burst and impulse, pneumatic, flexure fatigue, rotary flex, vibration, thermal cycling, pull-out and vacuum, with PMI and in-house NDT; destructive testing is performed at ISO/IEC 17025-accredited labs and third-party inspection is available on request. Country-of-origin and TAA questions are addressed on US origin & compliance. Datasheets and CAD are available to customers on request.
37° JIC Flare Fitting Applications: Hydraulics, Instrument Air & Oil & Gas
The 37° flare gives a reliable all-metal seal for medium- and high-pressure lines, which makes it a workhorse across fluid power and process instrumentation: hydraulic and fluid-power circuits, instrument air and sampling lines, and oil and gas production and processing where sour-service alloys and traceability matter. For hose and tube runs, JIC flares pair naturally with hydraulic tubing.
Why Crestflo for 37° JIC Flare Fittings
Crestflo is a US-serving manufacturer and supplier of 37° JIC flare fittings, the instrumentation division of a four-decade-old, Government-of-India-recognized export house with a Middle-East delivery track record, now serving the US with drop-in fittings. Fittings are supplied as engineered drop-in replacements backed by ASTM F1387, in both imperial and metric sizes, across a deeper alloy range than most competitors, with a heat-number MTC on every part and silver anti-galling and electropolish finishes available. Ready stock for standard items · made-to-order for specials · 6–8 week delivery. Small MOQ and private-label programs make it practical to standardize a line without carrying a major's lead time. We Engineer Confidence.
Request a Quote for 37° JIC Flare Fittings
Send sizes, alloy and configurations for a fast quote, order a sample, or set up a distributor, OEM or private-label program. Request a quote · request a sample · private-label program. US sales: sales@crestflousa.com · +1 346 594 9005 · Houston, TX. To confirm brand interchange, request your Parker Triple-Lok or Swagelok cross-reference from our engineering team via the cross-reference desk.
Frequently Asked Questions: 37° JIC Flare Fittings
Is a 37° flare the same as JIC?
Yes. JIC (Joint Industry Council) fittings use a 37° flare seat, and JIC, AN and SAE J514 all share the same 37° angle. They differ mainly in tolerance class, inspection and material pedigree rather than in the sealing geometry.
What flare angle is required for a JIC fitting?
37°. The fitting seals metal-to-metal where a 37° cone on the tube meets the fitting's 37° seat, clamped by a UNF straight-thread nut.
What are 37° flare fittings used for?
They connect medium- and high-pressure hydraulic and fluid-power lines, instrument air, sampling and process tubing where a reliable all-metal seal is needed. Crestflo rates them up to 15,000 PSI and up to 350 °C.
What is the difference between a 37° JIC flare and a 45° SAE flare?
They use different seat angles and are not interchangeable. The 37° flare is the JIC / SAE J514 standard for fluid power and instrumentation; the 45° flare is the SAE automotive and refrigeration standard. See 45° SAE flare fittings for that connection.
What is the difference between a 37° JIC flare and an ORFS (O-ring face seal) fitting?
They seal differently and do not interchange. A 37° JIC flare makes an all-metal seal on a 37° cone drawn up by a UNF straight-thread nut, whereas an ORFS (O-ring face seal) fitting to SAE J1453 seals with an elastomer O-ring captured in a flat face. Because they share neither the sealing surface nor the thread, a JIC flare nut will not seal against an ORFS flat-face body. Choose 37° JIC for all-metal medium- and high-pressure lines; ORFS is a flat-face, O-ring-sealed connection used where a soft seal is acceptable. Crestflo supplies the 37° JIC flare covered here; an ORFS line is a separate flat-face family.
What sizes and threads do Crestflo 37° JIC fittings come in?
Tube OD up to 2" (50 mm), in both imperial and metric, spanning dash -4 through -32 with the matching UNF straight threads defined by SAE J514.
What materials are available for 37° JIC flare fittings?
316/316L and 304/304L stainless, 904L, Duplex 2205, Super Duplex 2507, 254 SMO, AL-6XN, Alloy 20, the Inconel, Incoloy, Monel and Hastelloy nickel grades, Nickel 200/201 and Titanium Gr2, not carbon steel, brass or aluminum.
Are 37° JIC flare fittings NACE-compliant for sour service?
Yes. They are available NACE MR0175 / ISO 15156-compliant in suitable alloys such as 316/316L, duplex and nickel grades for sour hydrocarbon service.
Can I get a material test certificate?
Yes. Every part carries a heat or lot number, with EN 10204 MTC 3.1 supplied as standard and 3.2 available on request.
Do Crestflo fittings interchange with Parker Triple-Lok or other brands?
Dimensionally, the 37° JIC flare is an SAE J514 standard, so Crestflo fittings interchange with other J514 fittings on the standard geometry. That interchange is backed by ASTM F1387 performance qualification; request your brand cross-reference from the cross-reference desk.
Where are Crestflo 37° JIC fittings made?
They carry Indian origin, with US / European melt available on request and full material traceability. Ready stock for standard items, made-to-order for specials, and 6–8 week delivery; TAA and country-of-origin details are on US origin & compliance.
Can JIC fittings connect to NPT or compression tube fittings?
Yes. JIC-to-NPT, BSPP, BSPT, SAE-ORB and metric adapters are available, and Crestflo's 37° flare fittings are combinable with its compression tube fittings for a clean transition between connection methods.