1 Inch Hydraulic Hose Assemblies

The nominal inside diameter of a 1 inch hydraulic hose is 1 inch. This is different from the outside diameter, which varies with hose construction and reinforcement. A 1 inch hose is used where the circuit requires its flow capacity; substituting a smaller bore can increase fluid velocity, generate heat and restrict the hydraulic system.

Applications listed for 1 inch assemblies include large excavator implement lines, pump suction and case-drain lines, high-flow auxiliary circuits, return-to-tank and cooler lines, wheel loader circuits, dozer and ripper circuits, compaction equipment, telehandlers, truck-mounted hydraulics and hydraulic power units. The correct construction must be selected for the circuit.

Yes. McCann states that custom hydraulic hose assemblies from 1/4 in to 1 in can be fabricated in the shop or on site. On-site fabrication can be useful when a large-bore assembly is heavy or difficult to transport. Confirm the required hose construction, end fittings, routing and availability before the work begins.

The listed fitting options include JIC 37 degree, ORFS, SAE O-ring boss, NPTF, Code 61 and Code 62 split-flange, metric and BSPP ends. The correct fitting is identified from the failed hose or equipment information. Bring the old assembly or machine details so the connection type can be checked rather than guessed.

SAE J517 covers the 100R hydraulic hose constructions, while SAE J1273 provides guidance for selection, routing, fabrication, installation, storage and maintenance. Hose, fittings and crimp die should come from one manufacturer’s qualified matched system. The working pressure rating is not published here and must be confirmed for the selected construction and circuit.

Lower or mechanically block any raised attachment, isolate stored hydraulic energy under OSHA 29 CFR 1910.147 lockout/tagout procedures and depressurise the circuit before disconnecting it. Never search for a leak with your hand because pressurised fluid can cause an injection injury. Use cardboard to help locate leaks and keep open fittings clean during replacement.