Industrial Fittings

How to Choose an Industrial Hydraulic Fitting

Match these specs to the mating port and the line you are connecting before you order:

• Thread standard — JIC (37° flare), NPT (tapered pipe), ORB (SAE straight thread O-ring boss), SAE, or ORFS (flat-face O-ring). The fitting standard must match the port; a JIC nut will not seal on an NPT port even at the same nominal size.
• Size / dash — Fittings are sized by dash number (each dash equals 1/16 in.), so a -08 fitting matches a 1/2 in. line. Confirm both ends if the fitting adapts between two sizes.
• Material — Carbon steel for typical hydraulic pressure, brass for lower-pressure and air or water lines, stainless for corrosive media and washdown environments.
• Configuration — Straight, 45°, 90°, tee, cross, bulkhead, or run/branch tee. The geometry has to clear the routing and let you orient hoses without kinking.
• Seal method — Tapered threads (NPT) seal on the thread itself; ORB and ORFS seal on an O-ring, which holds pressure better under vibration and is easier to reuse.

Which Industrial Fitting Is Right for the Job?

Pick the family by how the connection is made and how often it comes apart. Use Adapters when you need to convert between thread standards or sizes on an existing port. Choose Crimp Fittings when you are building a permanent hose assembly to a set length. For lines that connect and disconnect often, Hydraulic Quick Couplers let you break the circuit without tools, and Live Swivels relieve hose twist on equipment that rotates under pressure. When a line sits open between uses, cap it with Dust Caps and Plugs to keep contamination out. If you run an Enerpac high-pressure setup, the dedicated Enerpac Hydraulic Couplers are rated for those circuits.

Complete the System

Fittings are one end of a connection, so plan the rest of the run with them. Pair the fittings with Hydraulic Hoses rated to the same working pressure, add Crimp Fittings to terminate each assembly, and use Adapters to bridge any thread mismatches at the port. For quick-disconnect points, spec Hydraulic Quick Couplers and protect exposed ends with Dust Caps and Plugs during storage and transport. Browse the full Hydraulic Fittings range to fill in any gaps in the assembly.

Cross-Referencing an Obsolete Industrial Fitting

An unmarked, discontinued, or OEM-specific fitting almost always has a current equivalent in a standard thread and dash size. Serving industrial accounts since 1963, Northern Hydraulics matches the thread standard, size, material, and seal type from a photo, a sample, or the part number on the line, then points you to the in-stock replacement. Bring the old fitting or its dimensions and request a cross-reference.