Testimonial: Procurement Management

Praise from a customer in West Africa, who offers services and general procurement management for companies in the mining, engineering and construction equipment and parts industry:

We will definitely be sharing with you enquiries from our customers for Hydraulic Pumps, we really appreciate your service.

Click through on the following links if you’d like to find out more about us and our customers, the markets and hydraulic manufacturers that we deal with and the hydraulic products and services that we can provide.

Hydraulic Cylinder

Whether you’re looking for a single or double-acting, tie-rod, marine, subsea or welded hydraulic cylinder, something standard or made-to-order, we have it covered…

Better still, you can relax knowing that you’re dealing with a company with over 75 years’ technical experience, backed by ISO 9001 accreditation… and that means that you’re in safe hands. We never compromise on quality on a hydraulic cylinder. Ever.

… I searched for ages to find the right size hydraulic cylinder and you guys came up trumps. Excellent service… really helpful.

If you’re looking for a “standard” hydraulic cylinder, then hop over to our catalogue where we showcase some of the more popular hydraulic cylinders we have on offer:

Hydraulic cylinder catalogue

If you can’t find what you’re looking for, you can always contact one of our hydraulic engineers – they love to talk – or go to enquire online go to our Contact page. If you’re looking for something a bit different, then our Bespoke Hydraulic Cylinder Design Form will help you capture the information we need to design a custom-made hydraulic cylinder tailored to your specific requirements and operating parameters. Just fill in as much as you can… we can work through the rest together afterwards.

Let’s take a quick look at the different types of hydraulic cylinder design available…

Tie Rod Cylinder: Tie rod style hydraulic cylinders use high-strength threaded steel rods to hold the two end caps to the cylinder barrel. This technique is most often seen in industrial factory applications. Small bore cylinders usually have 4 tie rods, while large bore cylinders could need as many as 16 or 20 tie rods to be able to keep the end caps under the extreme forces generated.

Welded Cylinder: A welded body hydraulic cylinder doesn’t have tie rods. The barrel is welded directly to the end caps; the ports are welded to the barrel; the front rod gland is then usually threaded into or bolted to the cylinder barrel. This enables the piston rod assembly and the rod seals to be removed for service.

Telescopic Cylinder: The length of a hydraulic cylinder is the total of the stroke, the thickness of the piston, the thickness of bottom and head and the length of the connections. If this total length does not fit in the space available, then a telescopic hydraulic cylinder enables the piston rod to also be used as a piston barrel housing a smaller second piston rod.

Plunger Cylinder: A plunger cylinder can only be used as a pushing cylinder; the maximum force is piston rod area multiplied by pressure. This generally means that a piston cylinder has a relatively thick piston rod.

Differential Cylinders: A differential hydraulic cylinder moves like a normal cylinder when pulling. However, If the hydraulic cylinder has to push, the hydraulic oil from the piston rod side of the cylinder is not returned to the reservoir, but instead is forced to the bottom side of the cylinder. This means the cylinder moves much faster, but the maximum force the cylinder can give is like a plunger cylinder. A differential cylinder can be manufactured like a normal cylinder, only a special control is added.

Rephasing Cylinders: Rephasing hydraulic cylinders are a combination of two or more cylinders plumbed in series or parallel, with the bores and rods sized such that all rods extend and/or retract equally when flow is directed to the first, or last, cylinder within the hydraulic system. In “parallel” applications, the bore and rod sizes remain the same, and the hydraulic cylinders are always used in pairs.

Single and Double-Acting Cylinders: A double-acting hydraulic cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston. It has a port at both ends, provided with hydraulic fluid for both the retraction and extension of the piston. A double-acting hydraulic cylinder is used where an external force is not available to retract the piston or where high force is required in both directions of travel. With a single-acting cylinder, when fluid flow is applied to a port in the closed end, the shaft extends until the collar or piston reaches the shaft end. When an external weight or load is placed on the shaft, the shaft will retract into the chamber until the piston or collar reaches the closed end. The cylinder generates an output force at the shaft end in proportion to its internal closed end area multiplied times the pressure potential of the fluid power system.

Can you let the boys know that they are providing us with great service, parts and information in all our locations. Your service is prompt and reliable; you’re our “go to” guys when it comes to hydraulics.

We’ve supplied hydraulic cylinders to customers all over the world, literally, in a vast range of markets…

Hydraulic Cylinders… including an international refuse and waste management services company who needed a number of 3-stage telescopic, double-acting hydraulic cylinders, and a power transmission equipment manufacturer who needed a complete hydraulic system and hydraulic cylinders for a tipping hopper application.

Welded Hydraulic Cylinders

Then there was the new overseas customer, a leading product design and manufacturing company within the renewable energy industry, who contacted our technical team needing support on a new product development project. Having used a tie-rod cylinder within one of their product designs before, they wanted to prototype a welded construction hydraulic cylinder instead. The cylinders (pictured right) were made to order for the customer… Remember that bespoke cylinder design service we spoke about?


These bespoke double-acting hydraulic cylinders pictured were designed as part of a bigger system design project for a new prototype machine for a British Original Equipment Manufacturer. We love bringing ideas to life!

And finally… If you’re just looking for technical information, then the good news is that we have a number of articles that may be of interest: how hydraulic cylinders work, hydraulic cylinder maintenance, hydraulic cylinder seals, hydraulic cylinder testing, hydraulic cylinder repair and hydraulic cylinder storage.

Hydraulics Catalogue


Visit our catalogue to see some of the hydraulic components we have within our range. If you can’t find what you’re looking for then call us or go to our Contact page to enquire online.

10 Ways to Ensure Effective Oil Analysis

Unplanned downtime disrupts business operations; effective oil analysis plays a vital role in looking after your machinery…

With 70 to 80 percent of all hydraulic failures being down to fluid contamination, it’s not exactly rocket science to say that ensuring regular, effective oil analysis should always be high on the agenda.

System DesignHydraulic component contamination is categorised in three ways: gaseous, liquid or solid. Gaseous contamination can damage a hydraulic system’s lubricating properties, creating wear and increasing the chances of other types of contamination. Liquid contamination not only alters the capabilities of the lubricating properties, but also causes rust. Solid contamination can cause valve blockages, substantial pump damage and blown seals and gaskets. All of these causes are completely avoidable.

Effective oil analysis – ten ways to keep your oil clean:

1. Monitor – Hydraulic fluid should be monitored routinely and sampled on a quarterly basis.

2. Identify – Identify what sort of contaminant may be present (solid, liquid or gas) to ensure that the right kind of analysis in undertaken.

3. Find the source – By identifying the source of the contamination, preventative action can be taken. This may include contamination as a consequence of the equipment manufacturing process, air borne contamination or contamination produced as a result of the equipment in operation.

4. Neutralise – Offset the causes, and minimise the consequences of contamination either through: oil transfusion, installing extra air filters and replacing worn or damaged components.

5. Benchmark – All oil analysis codes are based off a code: ISO 4406. The relevant benchmark depends on the application in question.

6. Filter – Using hydraulic filters and filtration equipment can, in many cases, stop oil contamination. Determining flow rates, viscosity and pressure are necessary to finding the right filtering system. As a leading hydraulic filter supplier we have widespread, competitive access to both leading and niche hydraulic filter manufacturers from around the world. Some of the hydraulic filter manufacturers and brands that we can supply include: Argo HytosDonaldsonEaton Vickers, Hydac, Ikron, MP Filtri and Parker hydraulic filters. Our technical team will be able to determine which filtration equipment is most suitable for your application.


Hydraulic Filters - Effective Oil Analysis


7. Analyse – In order for oil analysis to be reliable, an in-depth inspection will need to be carried out. This may be in a laboratory environment through microscopic particle count and gravimetric testing, or through a mobile particle counter installed on the machine.

8. Predict – Recording results will allow you to spot trends and identify possible future risks. This is hugely important to lessen unexpected machinery downtime and schedule future inspections in good time.

9. Prevent – To help prevent contamination:

  • Always make sure oil is filtered;
  • Change oil filters every 12 weeks;
  • Take oil samples every 12 weeks to check cleanliness level;
  • Install air breathers to reduce contamination.

10. Invest – There is, of course a cost involved in ensuring effective oil analysis, but it is  nothing compared to the cost of a replacement pump or even a complete system, lost production and goodwill.

And don’t forget…

Hydraulics Online have a wealth of experience in hydraulic system design and components. If you’d like to make an enquiry or you’d just like more information, you can call or send and email to one of our friendly technical team. If you’d like to see another blog on hydraulic systems design, click here.

“Can you let the boys know that they are providing us with great service, parts and information in all our locations. Your service is prompt and reliable; you’re our “go to” guys when it comes to hydraulics.”

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