ISO 1179-1:2013

Overview

ISO 1179-1:2013 specifies the dimensions, test expectations and designation rules for threaded ports with ISO 228-1 (G) threads intended for general use and fluid power applications. These ports are designed to interface with the stud ends defined in ISO 1179 parts 2, 3 and 4 and are widely used on hydraulic and pneumatic components such as pumps, valves, cylinders and accumulators.

The standard includes port dimensions (G 1/8 through G 2), spot-face types (Type N narrow and Type W wide), test method references and an identification statement recommended for catalogs and test reports.

Key Topics

• Port dimensions and tolerances: Ports conform to ISO 228-1 thread geometry; detailed dimensions and depths are provided in figure and table formats within the standard.
• Spot-face types: Type N (narrow) for metal-to-metal or elastomeric sealing types B and E; Type W (wide) for O-ring and retaining-ring seal types G and H.
• Compatibility and pressure guidance: Ports are applicable with specific stud-end types and rated working pressures, for example:
  • ISO 1179-2 (type E): S series up to 63 MPa (630 bar), L series up to 25 MPa (250 bar).
  • ISO 1179-3 (types G/H): L series up to 31.5 MPa (315 bar) for G and up to 20 MPa (200 bar) for adjustable H.
  • ISO 1179-4 (type B): S series up to 40 MPa (400 bar), L series up to 25 MPa (250 bar), LL series up to 10 MPa (100 bar).
  • Note: G2 port is mainly used with accumulators; ISO 1179-3 and ISO 1179-4 do not specify stud ends for G2.
• Testing: Ports are to be tested with the corresponding stud ends according to ISO 1179-2, ISO 1179-3 and ISO 1179-4. For lower rated pressures, test pressures should be agreed between manufacturer and user.
• Designation and identification: Ports shall be designated by "Port ISO 1179-1 - [thread size] - [spot-face letter]" (e.g., Port ISO 1179-1 - G 1/8 - N).

Applications

ISO 1179-1 ports are used where reliable, standardized threaded connections are required in hydraulic and pneumatic systems. Typical applications include:

• Hydraulic pumps, motors and valves
• Cylinders and actuators
• Accumulators (notably G2 size)
• General industrial piping and hose terminations where ISO 228-1 threaded ports are specified

Practical benefits include consistency across suppliers, clear designation for procurement and maintenance, and defined test and pressure guidance to support safe installation and operation. Users should ensure adequate material surrounds the port for the intended working pressure.

Related Standards

• ISO 1179-2, ISO 1179-3, ISO 1179-4 - compatible stud-end specifications and test methods
• ISO 228-1 - thread dimensions and tolerances (referenced)
• ISO 6149 series and ISO 16030 - recommended alternatives for new hydraulic and pneumatic designs

Keywords: ISO 1179-1, threaded ports, ISO 228-1, fluid power, stud ends, port dimensions, pressure ratings, hydraulic connections.