Hydraulic Fittings

Part markings, measurements and photographs give the team more to work with than a visual match alone. Include any details you know; the shop can discuss what further information is needed.

Hose or tube size

Thread diameter and pitch, if known

Connection style and sealing surface

Straight or angled orientation

Equipment and operating requirements

For an assembly inquiry, include the hose length, routing and the fitting at each end. Our existing Custom Hose Assemblies page provides the related service information.

Call 814-857-7566 or visit 4209 Clearfield-Woodland Highway, Mineral Springs, PA 16855. Call for current hours and availability.

Thread Type Illustrations

NPT — National Pipe Thread. Also commonly referred to as National Pipe Taper due to the tapered threads that create a seal by wedging together when tightened.

JIC — Joint Industrial Council. Straight threads with a 37° flare seat. Threads provide a clamping force while the flare creates the seal.

ORB — O-Ring Boss. Straight threads that use an O-Ring for sealing. The O-Ring is compressed against a flat surface to create a leak-proof seal.

ORFS — O-Ring Face Seal. Similar to O-Ring Boss but with a flat face that allows for a more robust seal under high pressure.

BSPP — British Standard Pipe Parallel. Uses parallel, straight threads (not tapered) and requires a separate sealing component, like an O-Ring or bonded washer, to create a pressure-tight connection.

Metric — Metric hydraulic fittings are connectors used in hydraulic systems that have threads conforming to the metric system, measured by diameter and pitch.

British — British metric hydraulic fittings are a combination of fittings that incorporate both British Standard Pipe (BSP) thread and metric (ISO) standards.

JIS — Japanese Industrial Standards. Often associated with a 30° flare seat angle and either metric or sometimes British Standard Pipe Parallel (BSPP) threads, and is commonly used in Japanese and other Asian-made heavy equipment.

Banjo — Used to connect fluid lines to components, consisting of a hollow, perforated bolt and a spherical union. Its name comes from the fitting’s shape, which resembles a banjo. The design allows for fluid transfer and uses washers to create a secure, leak-proof seal in systems like brakes, fuel lines, and industrial hydraulics.

INF (Inverted Flare) — Used to create a metal-to-metal seal by folding the end of the tubing inward before flaring it, allowing for a tighter, vibration-resistant connection.

SAE — A type of hydraulic fitting used in fluid power systems, including automotive and industrial applications. They are designed for straight thread and seal either with an O-Ring (O-Ring Boss, or ORB) or by deforming a flare.