Hydraulic Fitting Identification Guide

A replacement hydraulic fitting must match the connection and sealing system, not just the visible shape. Record the thread, size, sealing face and tube dimensions before requesting a match. A clear specification helps distinguish fittings that look similar but are designed for different connections.

Browse hydraulic fittings from IHPC Chennai after identifying the existing connection.

Parker’s thread-identification reference uses four checks: establish whether the thread is parallel or tapered, measure its pitch, determine its size, and record the full thread designation. Use a caliper and a suitable pitch gauge alongside the reference chart.

BSPP, BSPT, NPT/NPTF and metric threads are separate forms. For example, G1/8 and M14×1.5 describe different thread systems. Do not substitute a measured outside diameter for the complete thread specification, or assume that parts are compatible because they start to screw together.

Record the sealing face as well: a cone, an O-ring, a ferrule arrangement or another sealing feature must match the intended mating component. Photographs support identification; they do not replace dimensional confirmation.

For a tube connection, send the tube outside diameter, wall thickness and material, plus any marking on the body or nut. Note whether the required fitting is straight, an elbow, a tee or an adapter, and specify both ends separately.

The catalogue includes single-bite ferrule fittings, double-bite ferrule fittings and Ermeto fittings. These names do not make their components interchangeable.

As a specific example, Parker describes EO-2 as a metric 24° fitting system with an elastomeric tube-side seal. That description applies to EO-2; it should not be assigned to every Ermeto or ferrule product. Match the actual series and use its assembly instructions.

• Identification: manufacturer, part number, equipment model and readable photographs of the markings.
• Each connection: male or female, complete thread designation, measured dimensions and sealing-face photographs.
• Tube or hose: tube outside diameter and wall thickness, or the hose identification and end-connection details.
• Duty: fluid, operating pressure, pressure changes and operating temperature.
• Installation: fitting shape, orientation, available space, material requirement and quantity.

For a hydraulic ball valve, identify the connection at each port. For a Legris brass ball valve, confirm the exact series and its stated thread, medium and pressure-temperature limits. The same-looking port is not enough to select a replacement.

If a machine’s fitting has no readable part number, send an overall photograph, close-ups of both ends and the sealing surfaces, and your measurements. Add the machine drawing or bill of materials if available. Leave an uncertain thread designation marked as unknown instead of guessing.

IHPC can review the information with the current fitting range and advise what still needs confirmation. Have the selected component and assembly method checked against the equipment and manufacturer requirements before installation.

Use Parker’s hydraulic thread identification reference for the measurement sequence and thread chart, and the EO-2 brochure for that fitting system. Always use the technical data for the exact product being ordered.