How to Specify Hose Assembly Orientation (Offset Angle)

What it is

The offset angle (orientation, phase angle) is the angle between the two elbow fittings on one hose assembly, seen along the hose. A hose built with the wrong angle has to be twisted to fit. Twisting a hydraulic hose shortens its life sharply and can loosen fittings.

Straight-to-elbow assemblies do not need an offset angle. Elbow-to-elbow assemblies do.

How to measure

1. Lay the old assembly flat and straight, without twisting it.
2. Look along the hose from one end, so the hose runs straight away from you.
3. Turn the assembly so the near elbow points straight up (12 o'clock).
4. Note the direction the far elbow points.
5. Measure the angle from the near elbow clockwise to the far elbow. Round to the nearest degree or the shop's step.
6. Record which end was the near end, if the two fittings are different.

Offset angle examples

Some shops state angles only up to 180° and say "left" or "right" instead. Ask the shop which convention it uses.

Key points

• Measure from the old hose on the bench, not on the machine where it may be twisted.
• If the old hose is twisted on the machine, read the layline. The printed line should run straight along the hose. A spiral layline means twist.
• For new routes, set the elbows on the machine, then measure the angle needed with the hose laid in its real path.
• Write the angle on the work order with the length, fittings and hose type.
• The direction you look along the hose changes the clockwise reading. Always say which end you viewed from.

Common mistakes

• Ordering an elbow-to-elbow assembly with no angle.
• Measuring the angle counterclockwise or from the wrong end.
• Twisting a hose at install to line up fittings.
• Measuring a hose that was twisted on the machine and copying the twist.

Governing standards: SAE J1273 (recommended practices for hydraulic hose assemblies); the hose assembly shop's ordering convention.

Reference only. Verify against the current governing code or standard, the manufacturer's data and the project documents before use. Apps for Distributors disclaims liability arising from reliance on this reference.