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Hydraulic Fittings are connecting parts used to connect Hoses, Tubes and Hydraulic components with each other. Hydraulic systems generally operate at high pressure and require leak free enclosure.
These fittings are designed in such a way, that each fitting has its different design and pressure rating.
Different type of fittings depends on their size, configuration and thread type.
Types of Fitting
- Thread Type Fittings
- O-ring Type Fittings
- Mate Angle Type Fittings
Different types of fittings allow to connect Tube to Tube, Tube to Hose, Hose to Hose, Hose to Valve having straight type, elbow, tee and cross type connection options.
Different fittings have different threads
Also referred to as Whitworth threads, the BSP thread type fittings seal using metal to metal angled surfaces or a combination of metal to metal and an O-ring. The angle of the sealing surfaces is 60° for both forms.
There are two popular thread forms, British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT).
Identification is made by measuring the outside diameter of the thread and the number of threads per inch
JIC – Joint Industry Council Thread – SAE JIC 37°:
Commonly referred to as just JIC fittings these metal to metal sealing type fittings have a 37° flare (sealing surface angle) and straight United National Fine straight Threads (UNF).
The original design specification for the fittings comes from the Society of Automotive Engineers (SAE) and these fittings are the most common American fitting type in Europe.
ISO 12151-5, ISO8434-2 and SAE J516
DIN 24° Light (L) and Heavy Series (S) with O-ring:
The male has a 24° sealing angle cone seat with straight metric threads.
The female has a 24° convex cone with O-ring and a swivel straight metric threaded nut.
ISO 12151-2 / ISO 8434-1 & ISO 8434-4
It is always recommended to use good quality of hydraulic fittings to eliminate any leakages from the hydraulic system.
Hydraulic Fittings are mostly made of Carbon Steel and Stainless Steel (for rusty environment).
Some of the Hydraulic Fittings are mentioned below.
- Weldable Nipples
- Straight Coupling
- Equal Elbow
- Equal Tee
- Equal Cross
- Banjo Coupling
- Bulkhead Coupling
- Swivel Adaptors
- Swivel Elbows
- Swivel Barrel Tee
- Swivel Branch Tee
- Swivel Reducers
- Hose Adaptors
- Gauge Connectors
Tube fitting are standardized according to DIN 8434.
Some of the reputed Hydraulic fittings manufacturers are mentioned below.