Hydraulic hose fittings can be found in almost every industry, but not all do the same job. Given the diversity of their usage, choosing the right hydraulic supplies to suit your application, hose and assembly is vital. Holdfast Fluid Power is the specialist provider of hydraulic products and services to the Mining, Civil, Marine & Offshore industries. Read on for some useful information on hydraulic hose fittings.
What Are Hydraulic Fittings?
Hydraulic fittings are parts that are used to connect hydraulic hoses to other components. Used in a broad variety of machines and equipment across all major industries, there are many different types of hydraulic fittings and each one serves a different purpose. They also come in different sizes, materials, types of seals, and temperature and pressure tolerances.
Permanent Vs Field Attachable Fittings
The two main types of hydraulic fittings are permanent (crimped) fittings and field attachable (reusable) fittings.
Field attachable fittings consist of a socket and a nipple and can be installed anywhere without using a crimper.
A crimped fitting is a permanent fitting that is sealed with a crimping machine. More secure than a field attachable fitting, however they do require the use of specialised equipment to create the seal.
What are the Most Common Materials Used in Hydraulic Hose Fittings?
Plastic – cheaper and more resistant to corrosion than their metal counterparts, however, plastic fittings are weaker and less durable.
Steel – made of steel alloys, these fittings are more durable than plastic versions and can withstand much higher temperatures.
Stainless-Steel – used in situations where the fitting needs to withstand temperatures ranging from -253°C up to 648°C. Durable and robust, stainless steel is the choice of fitting for highly corrosive and high-pressure environments.
Brass – not as strong or durable as stainless-steel fittings, however, they are rated for temperatures from -53°C up to 204°C, and pressures up to 3,000 psi. They can also provide a tight seal that prevents leaks, and they meet many global standards including:
- SAE (Society of Automotive Engineers)
- ISO (International Organization for Standardization)
- DIN (Deutsches Institute für Normung)
- JIS (Japanese Industrial Standards)
Fitting Ends & Connector Types
The three most common fitting ends and connector types for hydraulic fittings are the O-ring, the mated angle, and the tapered thread connectors.
O-Ring Face Seal (ORFS) – these provide secure and reliable seals preferred for applications with any risk of leaking fluids. ORFS fittings can be split into several different types including straight, elbow, tee, cross and more.
Mated Angle – these feature an angle seat equipped with either straight or parallel threads for sealing.
Tapered Threads – male fittings have their threads on the outside, while female fittings have theirs on the inside. The tapered thread deforms when the male and female fittings are threaded together. This applies pressure on the couplings, creating the seal.
Choosing the Right End Fittings for a Hydraulic Hose
To ensure you select the right end fittings for your hydraulic hoses, you need to consider the below:
- Size – the important measurements are the internal and external diameters of the hydraulic fittings. The diameters have to be compatible with that of the hydraulic hose.
- Material – different materials have different properties which determine the compatibility with the fluid.
- Pressure – the amount of pressure the hydraulic fitting is subjected to differs across industries and applications. Make sure that the fittings are rated for the pressure range required.
- Assembly – hydraulic systems that require frequent connections and disconnections of the hose should consider quick-connect fittings.
- Permanence – needing a permanent fitting or one that can be removed and changed frequently will affect the fitting style you choose.
Additionally, the hydraulic fluids used in the industry will also determine what type of coupling is best. Not all fittings are compatible with all hydraulic fluids.
It’s important to consult a professional when deciding which type of hydraulic hose fittings to use. Using the incorrect fitting could lead to malfunctions, damage, and even endanger lives.
For Expert Advice and Quality Hydraulic Supplies, Perth Can Rely on Holdfast Fluid Power
As one of Western Australia’s most knowledgeable providers of hydraulic hose supply, install and maintenance, we offer a range of services and supplies for hydraulic systems of all types. For professional advice, get in touch with a Holdfast technician either online or by calling 1300 HOLDFAST today.