JIC Fittings Guide › JIC vs ORFS

JIC vs ORFS: 37° Flare vs O-Ring Face Seal Fittings

JIC 37° flare and ORFS (O-Ring Face Seal) are the two dominant inch-size tube and hose connections in North American hydraulics. ORFS is widely specified on mobile and construction equipment for its leak resistance, while JIC remains the low-cost, high-temperature, all-metal workhorse. Here is how they differ and how to choose. Background on JIC sizes is in the main JIC fittings guide.

The Standards

JIC is defined by SAE J514 and ISO 8434-2. ORFS is defined by SAE J1453 and ISO 8434-3; Parker sells its ORFS line as O-Lok®, and Parker's literature lists the O-Lok connection under ISO 8434-3 / SAE J1453 and the 37° connection under ISO 8434-2 / SAE J514.

How Each Seals

JIC: metal-to-metal cone

The male and female halves both have 37° seats. Tightening the nut forces the cones together into a line of contact. The seal is all metal, so there is no elastomer to age or select for fluid compatibility, but the seal quality depends on surface finish, cleanliness and correct torque. Under-torque leaks; over-torque can deform or crack the flare.

ORFS: elastomer O-ring on a flat face

The male ORFS fitting has a flat face with an O-ring held in a groove. The female has a flat, machined face. Tightening the nut compresses the O-ring against the flat face, similar to a flange seal; the threads only hold the joint mechanically. Industry identification guides describe ORFS as offering the best leakage control available among common hydraulic connections, because the O-ring tolerates small variations in torque and absorbs vibration better than a metal line contact.

Comparison Table

Thread Sizes Are Different

JIC and ORFS fittings for the same tube size use different threads, so they cannot be screwed together. This is useful: the two are hard to cross-connect by mistake. Thread sizes below are taken from Swagelok's Thread and End Connection Identification Guide and hydraulic distributor thread guides.

Note the trap at the small end: a -6 JIC thread (9/16-18) is the same as a -4 ORFS thread. A -4 ORFS male will physically accept a -6 JIC female nut, but the seal surfaces are incompatible and it will not seal. Always confirm the sealing surface, not just the thread. Our identification guide explains how.

Which One Should You Use?

Choose ORFS when

• Leak-free operation is critical — e.g. high-pressure mobile equipment, environmentally sensitive sites.
• The connection sees high vibration or pressure spikes.
• You need to remove a component without springing tubes apart, since flat faces can slide in radially.
• The OEM already specifies ORFS (very common on construction and agricultural equipment).

Choose JIC when

• Cost and availability matter most.
• Fluid temperature or chemistry makes elastomer selection difficult; JIC has no O-ring.
• You are maintaining existing JIC systems — mixing types adds adapters and leak points.
• You need a very wide range of configurations and materials off the shelf.

Converting Between JIC and ORFS

JIC-to-ORFS adapters are standard catalog items (for example, ORFS male × JIC male, straight or 90°). When replacing components on equipment, it is generally best to stay with the system's existing connection type and only adapt where a component forces it. Each adapter adds a leak point, cost and length.

Installation Tips

• ORFS: Inspect the O-ring and replace it whenever the joint is disturbed; ensure it is seated in the groove; lubricate lightly with system fluid; keep the flat face free of scratches.
• JIC: Keep the flare clean, do not use sealant, align the fitting before tightening, and follow the manufacturer's torque or flats-from-wrench-resistance (FFWR) method.
• Both: Support hose and tube runs so the fitting is not carrying side load.

Ordering

When requesting pricing, state connection type for each end (e.g. "-8 ORFS male × -8 JIC male, 90°"), material, plating, and quantity. See also JIC vs NPT, JIC vs AN and our JIC thread size chart.

Cost and Lifecycle Considerations

Purchase price is only part of the comparison. JIC fittings are usually cheaper per piece and are stocked in more configurations, which makes them attractive for general industrial machinery, test stands and prototypes. But a JIC joint that weeps after repeated assembly can cost far more in cleanup, fluid and downtime than the fitting itself. ORFS adds the cost of the O-ring and the need to keep spare O-rings in the correct compound, but its tolerance to vibration and torque variation means fewer callbacks on equipment that shakes, flexes or sees pressure spikes. Many OEMs of construction, forestry and agricultural machinery have standardized on ORFS for exactly this reason, while JIC remains common on industrial power units, presses and older equipment.

Temperature and fluid also matter. Because JIC has no elastomer, it is a natural choice where an O-ring compound would be a weak point, such as high fluid temperatures or unusual fluids. With ORFS, confirm the O-ring compound suits the fluid and temperature range; distributors commonly supply 90-durometer nitrile O-rings as standard, with other compounds available on request.

Identifying ORFS vs JIC in the Field

The quickest check is visual: a male ORFS fitting has a flat face with an O-ring in a groove, while a male JIC has a 37° cone nose. On the female side, ORFS has a flat machined face inside the nut and JIC has a 37° cone seat. If the nut threads on but you are unsure, measure the thread and compare with the table above, then confirm the seat with a seat angle gauge.

FAQ

Related guides

• JIC Fittings Guide (main)
• JIC vs NPT
• JIC vs AN
• How to Identify a JIC Fitting
• JIC Thread Size Chart
• -4 JIC Fittings
• -6 JIC Fittings
• -8 JIC Fittings
• -10 JIC Fittings
• -12 JIC Fittings
• -16 JIC Fittings
• JIC vs SAE 45° Flare
• JIC vs BSPP
• JIC vs Metric (DIN 24°)
• JIC Torque Specs
• JIC Fitting Types
• JIC Materials & Pressure Ratings

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