HGW Blog

National Pipe Straight Mechanical describes a parallel pipe thread used in a mechanically seated connection. In common hydraulic hose-end arrangements, the straight threads pull a swivel nut onto a compatible male nose while the mating seats form the seal. The threads retain the parts; they are not normally the primary fluid boundary. This distinction explains two frequent service problems. A stra

SAE O-Ring Boss is a port connection built around a replaceable elastomer seal. The male fitting’s straight thread supplies clamping force; an O-ring near the shoulder compresses against the port entrance to contain fluid. Keeping those jobs separate makes ORB easier to identify, install, and diagnose than a connection judged only by thread appearance. ORB commonly appears in hydraulic manifolds,

ORB and NPT are both used to connect fittings to ports, but they control leakage in different places. An SAE O-Ring Boss connection uses straight threads to retain the fitting and an O-ring at the port to seal. National Pipe Taper relies on tapered thread interference, normally with an approved sealant. That distinction affects installation, reuse, orientation, and troubleshooting. The better choi

An O-Ring Face Seal connection separates the clamping function from the sealing surface. Straight threads draw a flat male face against the female end, while an O-ring captured in the male face provides the seal. This geometry is the reason ORFS is common in hydraulic systems exposed to pressure cycling and vibration. The benefit depends on correct parts and assembly. A flattened face, missing or

A hydraulic hose cross-reference is not a declaration that one manufacturer’s series is equivalent to another. It is a documented comparison showing that a proposed hose-and-fitting system meets every controlling requirement of a particular assembly. A common SAE category is a useful starting filter, not the final approval. Capture the incumbent assembly before searching Record the hose layline, m

Hydraulic hose carries fluid between pumps, valves, cylinders, motors, and other moving or difficult-to-pipe components. Its job is not defined by pressure alone. The same assembly must contain the fluid, tolerate heat and impulse, fit the route, resist the external environment, and work with the specified ends. That makes hose selection a system decision. Begin with the required bore and service

Hydraulic hose installations often have to route around pumps, coolers, filters, cylinders, actuators, and moving machine parts. In those layouts, bend radius is not a cosmetic detail. It directly affects hose life and system safety. If a hose is bent tighter than its minimum bend radius, the reinforcement and tube can be damaged even before the system is put into full service. What Minimum Bend R

ORFS fittings use an O-ring face seal to control leakage at the mating surface. The threads pull the connection together, while the O-ring seals at the flat face of the fitting. This design is why ORFS connections are common where hydraulic systems need strong leakage control, vibration resistance, and serviceable assembly. Thread Sizing ORFS fittings use straight threads. The outside diameter is

Most hydraulic systems do not need a winner between stainless tube and hose. They need boundaries: rigid lines where geometry should remain fixed, flexible assemblies where components move or vibration must be isolated, and controlled transitions between the two. That zone-based approach is more useful than assigning the entire circuit to one material. Locate every source of relative movement Mark

Stainless steel hose fittings and adapters are used when the system needs more than basic connection hardware. The added value is usually durability, corrosion resistance, cleanability, or longer service life in a demanding environment. Other materials such as carbon steel, brass, aluminum, and plastic can be right in many applications. Stainless steel makes sense when the operating conditions jus