Hydraulic Fitting Identification: Threads & Seals
Identify hydraulic fittings by their thread and sealing face, then check both ends of the assembly. This guide explains the details and photographs needed to distinguish similar-looking connections.
Discuss Your Requirement
A fitting identification checklist.
Identify hydraulic fittings by their thread and sealing face, then check both ends of the assembly. This guide explains the details and photographs needed to distinguish similar-looking connections.
Record the Connection Family
Photograph the thread and sealing face from several angles. Record male/female form, nominal size, pitch and the actual seal arrangement. Note whether the fitting is fixed or swivel.
Measure the Geometry
Record relevant diameter and pitch measurements, elbow angle and tube dimensions. For flange ends, include head geometry, seal seat and mating-port information. Keep hose bore separate from thread size.
Identify the Hose Attachment
Record the hose manufacturer, series and nominal inside diameter. Crimp inserts and ferrules must match the selected hose and approved assembly method; appearance or a shared nominal size is not sufficient.
Questions Before You Enquire
Can I Identify BSP or Metric From Outside Diameter Alone?
No. Diameter, pitch, thread form and sealing geometry must be considered together. Send measured details and the existing reference where available.
What Photographs Are Useful?
Show the complete fitting, both sides of the connection, a close view of the seal and thread, and any readable identification. Add measurements with units and the mating-part details.
How Do I Specify Two Angled Hose Ends?
Identify each elbow and show their relative orientation on the assembly drawing. The angle of each end and the angular relationship between ends are different details.