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ORFS Fittings – O-ring face seal Tube fitting & Hydraulic Fittings

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ORFS Fittings – O-ring face seal Tube fitting & Hydraulic Fittings

SAE O-Ring Face Seal (ORFS) Fittings

SAE O-Ring Face Seal (ORFS) fittings are designed to provide reliable sealing for liquids and gases from vacuum up to 6000 psig. These fittings can be applied to both tubing and pipe, making them highly versatile fluid connectors. ORFS fittings are known as “zero clearance” fittings, meaning they can be installed or removed without cutting, bending, or flexing the pipe or tubing. This makes them ideal for systems that require frequent maintenance, as well as valves and components that need periodic replacement.

Features

  • Zero Clearance System: No need to spring or pull the tubing to install or remove fittings or other components.

  • Unlimited Remakes: Fittings can be disassembled and reassembled multiple times. Simply replace the O-ring and tighten to the recommended torque.

  • Forgiving Assembly: The soft-seal design allows the O-ring to conform to minor surface irregularities, reducing the risk of leakage due to slight assembly variations.

Specifications

  • Working Pressure: Vacuum to 6000 psig

  • Temperature Rating: Up to 400°F (204°C)

  • Body Materials: 316 / 316L Stainless Steel, Alloy 400

  • O-Ring Materials: FKM (Standard), Buna-N, others available upon request

  • Sizes: 1/8” to 2”

  • End Connections: ORFS, NPT, BSP, SAE, NPSM

  • Shapes: Straight, Elbows, Tees, Bulkheads

How Soft-Seal O-Ring Face Seal Fittings Work

The Soft-Seal ORFS fitting assembly consists of four main components: a threaded fitting body with an O-ring groove, an O-ring, a nut, and a sleeve or tailpiece. The standard O-ring material is Buna-N, while other elastomers are available for special applications.

Sealing occurs when the sleeve or tailpiece—secured to the tubing by brazing, welding, or mechanical flanging—compresses the O-ring against the flat face of the threaded fitting body. As the nut is tightened onto the fitting body threads, it draws the sleeve into full contact with the fitting face, creating a secure, leak-free seal suitable for high-pressure hydraulic and gas systems.

Installation Torque
Size Tube OD Torque (in./lb.)
-4 1/4 20-40
-6 3/8 25-50
-8 1/2 40-75
-10 5/8 60-120
-12 3/4 110-220
-16 1 180-350
-20 1 1/4 265-530
-24 1 1/2 360-720
-32 2 750-1490

ORFS Fittings

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Orfs Fittings – O Ring Face Seal Nut