Straight fittings AB (ORFS/BSP)
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Straight fittings AB (ORFS/BSP)
Straight connectors AB feature a nut on one side and a male thread on the other. A = nut with ORFS thread - flat seal. Side B with male thread - British inch BSP. ORFS has a very characteristic flat seal (no cone). Straight fittings AB ORFS BSP are hydraulic elements that allow connecting hoses and components in hydraulic systems. The abbreviation ORFS stands for "O-Ring Face Seal", which refers to the face seal using an o-ring, providing a reliable and leak-proof connection. On the other hand, BSP is "British Standard Pipe", a pipe thread standard used in many industrial applications. Connectors of this type are used relatively rarely, they are found in modern construction equipment mainly of American production. Execution: free-cutting steel with anti-corrosion coating (zinc). Fittings intended for connecting hydraulic hoses. Our offer also includes connectors with two external threads.
Straight fittings AB (ORFS/BSP) female-male reduction adapters ORFS to BSP
Straight fittings AB (ORFS/BSP) are specialized power hydraulics reduction adapters designed for leak-free connection and adaptation of two different connection standards: the American ORFS (O-Ring Face Seal) system with a flat face seal and the British inch BSP (British Standard Pipe) thread. The AB type construction features a swivel nut with internal thread on one side (side A) and an external male thread on the other side (side B), which allows for instant assembly in the hose axis without the need to rotate the connected pressure hoses. These fittings provide a transition between a flat face seal with an O-ring (ISO 8434-3 / SAE J1453 standard) and a 60° sealing cone or BSP body port (ISO 8434-6 / BS 5200). Made of high-grade free-cutting steel protected with an anti-corrosion zinc coating, straight fittings AB ORFS/BSP guarantee the highest level of mechanical tightness, resistance to vibration, and durability under operating pressures reaching up to 280–420 bar in construction, agricultural, forestry machinery, and industrial equipment.
Application and technical characteristics of straight fittings AB (ORFS/BSP)
Transition adapters AB (ORFS/BSP) are commonly used in modern power hydraulics when adapting accessories and supply systems in construction and agricultural machinery of American and Asian brands (including Caterpillar, Komatsu, Volvo, Bobcat, John Deere) to hoses and elements with standard BSP threads.
- Combining ORFS and BSP standards: They enable seamless adaptation of ORFS nuts and threads (e.g., 9/16"-18, 11/16"-16, 13/16"-16, 1"-14, 1.3/16"-12, 1.7/16"-12 UNF) with BSP threads and nuts (e.g., 1/4", 3/8", 1/2", 3/4", 1" BSP).
- Female-male construction (A-B): The presence of a swivel nut on side A allows the connection to be tightened in tight workspaces without longitudinal twisting of flexible pressure hoses.
- Leak-free flat O-ring seal: On the ORFS side, tightness is achieved by pressing the flat face against a rubber O-ring seated in the face groove, which completely eliminates micro-leaks during pressure spikes.
- Extreme pressure resistance: Massive construction made of free-cutting steel allows for operation at continuous working pressure up to 280–420 bar and shows resistance to vibration and hydraulic shocks.
- Durable anti-corrosion coating: Galvanized zinc surface (white passivation) protects the element against the harmful effects of moisture, salt, and hydraulic oils.
Why choose straight fittings AB (ORFS/BSP) at the HYDRON store?
Straight fittings AB (ORFS/BSP) supplied by the HYDRON brand are manufactured in accordance with strict dimensional regimes of ISO 8434-3 (ORFS) and ISO 8434-6 (BSP) standards. Precisely made O-ring grooves and ground face seals guarantee 100% tightness and work safety of the installation under the highest load. Dimensional variety allows for the elimination of the need for several cascading adapters on one connection port. For comprehensive construction and service of the power hydraulics system, we recommend choosing other components from our offer, such as flexible hydraulic hoses, matching steel hose ends, self-sealing test points and reliable hydraulic quick couplings.
Technical specification
| Technical parameter | Value / Description |
|---|---|
| Product category | Straight fittings AB (ORFS/BSP) – female-male reduction adapters |
| Connection type | Straight A-B (A = female swivel nut, B = male external thread) |
| ORFS thread standard | American inch UN/UNF (9/16", 11/16", 13/16", 1", 1.3/16", 1.7/16") – flat face with O-ring |
| BSP thread standard | Inch pipe parallel BSP / BSPP (G 1/8", 1/4", 3/8", 1/2", 3/4", 1") – 60° cone or ED |
| Materials and surface protection | Free-cutting / weldable steel, galvanized (white passivation) |
| Maximum operating pressure | from 280 bar to 420 bar (depending on the fitting size) |
| Compliance with standards | ISO 8434-3 / SAE J1453 (ORFS), ISO 8434-6 / BS 5200 (BSP) |
| Operating temperature range | from -20°C to +120°C (for NBR / galvanized steel) |
Frequently Asked Questions (FAQ)
What distinguishes an ORFS type seal?
The ORFS (O-Ring Face Seal) system seals on a flat contact surface using an elastomeric O-ring seated in the face groove of the male fitting. This ensures 100% resistance to micro-leaks and vibration, making it one of the tightest systems in power hydraulics.
What does the symbol AB mean in the ORFS/BSP fitting name?
The AB designation defines the fitting construction: side A has a swivel nut with internal thread (female), while side B is equipped with a male thread (male). This allows elements to be connected without having to rotate the entire pressure hose.
In what machines are ORFS/BSP straight-through connections used?
ORFS/BSP straight-through fittings are commonly used in construction, agricultural, and forestry machinery of American and Asian brands (Caterpillar, Komatsu, Volvo, Bobcat, John Deere), where it is necessary to connect the factory ORFS system with gauges, directional control valves, or hoses in the European BSP standard.
Should Teflon tape be used when tightening an ORFS flat connection?
No. The ORFS seal is achieved mechanically by pressing the flat face against a rubber O-ring. Using hemp, Teflon tapes, or adhesives on ORFS threads is unnecessary and can damage the seal.