1-1/2 Inch Hydraulic Hose | Sizes, Models & Specifications

1-1/2 inch — dash 24, 37.7–39.3 mm bore — is one of the larger sizes hydraulic hose distributors commonly stock. It is used mainly on heavy equipment where flow exceeds 500 L/min and the hose is treated as part of the machine structure.

1-1/2 Inch Hydraulic Hose: Pressure Rating by Construction

1SNBraided, 1 wire5.0 MPa (50 bar)2SNBraided, 2 wire8.5 MPa (85 bar)4SPSpiral, 4 wire18.5 MPa (185 bar)4SHSpiral, 4 wire29.0 MPa (290 bar)

Four constructions are produced in the 1-1/2 inch bore. Working pressure is the continuous rating at 30–60 °C with mineral oil; burst pressure is the minimum before rupture (typically 4× working pressure).

Nominal bore 37.7–39.3 mm, outside diameter 52.1 mm (1SN), minimum bend radius 500 mm, weight 1.5 kg/m (1SN).

Where 1-1/2 Inch Hydraulic Hose Is Used

• Ultra-class mining equipment — Hoist, steering and brake circuits on 240 tonne and larger haul trucks.
• Metallurgical and steel plant hydraulics — Continuous casters, furnace tilting and rolling mill screw-downs.
• Large marine hydraulic systems — Deck cranes, mooring winches and hatch cover drives on bulk carriers.
• Heavy-duty balers and shredders — Recycling and scrap processing equipment where flow is high and duty cycle is close to continuous.

How to Choose the Right Construction

The braided ratings at this bore are low — 5.0 MPa for 1SN and 8.5 MPa for 2SN — so 1-1/2 inch is effectively a spiral-hose size. 4SP gives 18.5 MPa and 4SH 29 MPa. For anything above 250 bar, 4SH is normally the practical choice; below that, 4SP saves weight and cost.

Fittings for 1-1/2 Inch Hose

Code 62 flanges dominate, with BSPP 1-1/2" and JIC 1-7/8-12 available for threaded ports. Because a 10 m filled 1-1/2 inch assembly can weigh over 25 kg, use two people or a sling when installing.

Frequently Asked Questions

What is the minimum bend radius for 1-1/2 inch hose?

500 mm for 1SN and 560 mm for four-spiral hose. Bending tighter than this shortens service life dramatically.

Is 1-1/2 inch hose available with a fire-resistant cover?

Yes. YIBO supplies MSHA-accepted and flame-retardant cover options for mining and steel plant applications.

How much oil does 1-1/2 inch hose hold?

About 1.1 L per metre of length, so a 10 m run adds roughly 11 litres to the system volume — factor that into the reservoir sizing.

Tell us the working pressure, flow rate, fluid and fitting type, and YIBO will confirm the exact model, bend radius and lead time for your 1-1/2 inch hose. Samples are available for approval before volume production.