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 fill in a stock enquiry form. 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.

Welded Hydraulic Cylinders

So, we think we know why you’re here… You’re looking for welded hydraulic cylinders, right?

Well, whether you are looking for a relatively “standard”, or completely bespoke welded hydraulic cylinders, you can rest assured knowing that, with over 75 years’ technical experience and our ISO 9001 accreditation under our belt, you’ll be in safe hands. And if you know exactly what you need then that’s great. But if, like the majority of our customers, you need some guidance, then that suits us too.

Whilst tie rod cylinders can be used in a range of applications, welded hydraulic cylinders have more advantageous benefits to a hydraulic system; tending to have a short overall length and a narrow body, welded hydraulic cylinders can sit comfortably in tight spaces within machinery. These cylinders can be easily customised and are also less likely to experience failure, thanks to the tie rod stretch at high pressures and long strokes.

Welded Hydraulic CylindersApplications that use welded hydraulic cylinders typically include construction apparatus (excavators, bulldozers and road grader) and material handling equipment (forklift trucks, telehandlers and lift-gates); cranes, oil rigs and large off-road vehicles are also common examples of other applications.

The standard range of welded hydraulic cylinders (provided by hydraulic companies such as Bosch Rexroth, Hydac and Eaton Vickers) usually offer the following features:

  • Piston Rod Construction: The piston rod of a hydraulic cylinder functions both inside and outside the barrel, therefore also functions both in and out of the hydraulic fluid and surrounding atmosphere;
  • Metallic Coatings: It’s necessary to have smooth and hard surfaces on the external diameter of the piston rod and slide rings for proper sealing. Corrosion resistance is also beneficial – a chromium layer may often be useful on the external surfaces of these parts, though chromium layers may be porous, and could attract moisture and ultimately cause oxidation. In harsh marine circumstances, the steel is therefore frequently treated with both a nickel layer and a chromium layer – often 40 to 150 micrometre thick layers are applied. Solid stainless steel rods are occasionally used: high quality stainless steel such as AISI 316 can be used for low pressure applications while other stainless steels such as AISI 431 can be used where applications have higher stresses, but lower corrosion problems.
  • Ceramic Coatings: Because of the inadequacies of metallic materials, ceramic coatings were advanced. Initially ceramic protection schemes seemed ideal, but porosity was higher than projected. Recently, the corrosion resistant semi ceramic Lunac 2+ coatings were introduced. These hard coatings are non-porous and don’t tend to experience high brittleness.
  • Lengths: Typically, piston rods are available in lengths which are cut to suit the application. As the common rods have a soft or mild steel core, the ends can be welded or machined for a screw thread.

Hydraulic ManufacturersHydraulics Online has widespread, competitive access to quality, welded hydraulic cylinder manufacturers worldwide. The key word is quality. Our ISO 9001 accreditation is your guarantee that we will never compromise on quality, nor make promises that we can’t keep. Aside from obvious routine servicing and maintenance, we want you to be able to “fit and forget” any equipment we supply.

Introducing our standard range of welded hydraulic cylinders…

Hydraulics CatalogueOur catalogue showcases some of the hydraulic cylinders that we are regularly asked to supply: single and double-acting cylinders, tie rod, marine / subsea and welded hydraulic cylinders – you can find them all here. It is only a small selection though, we couldn’t possibly squeeze in everything that we do, so if you can’t find what you’re looking for then call us or complete our Stock Enquiry Form

Weleded hydraulic cylindersOur range of welded hydraulic cylinders (pictured) have significant internal bearing lengths reflected in their design, and are constructed with high quality materials together with proven seal types and a choice of sealing systems and materials. Also available is an end of stroke cushioning, for either or both ends of stroke. All of our welded hydraulic cylinders can be supplied with: internal full displacement positional transducers, end of stroke sensors and control valve packages – valves built directly into the cylinder endcap or manifolded onto the cylinder.

Maybe you’re looking for something completely bespoke – welded hydraulic cylinders designed and built so suit your exact requirements…

Whether you simply need a “one-off” or are looking for regular, reliable supplies at volume, we can  provide custom-made welded hydraulic cylinders to suit your specific application, requirements and operating parameters. As long as you know what your end goal is, then we have the hydraulic cylinder design and wider systems expertise to help you achieve it. There’s no minimum order quantity, so if you only need one hydraulic cylinder making that’s fine. Even if your ideas are still on the drawing board our technical team can provide you with an upfront design and outline prices, and then support you through final production and beyond into “business as usual” activities and production.

You can find our bespoke hydraulic cylinder design form here.

To give you a quick example…

Bespoke Welded Hydraulic CylindersA new overseas customer, a prominent product design and manufacturing company within the renewable energy industry, contacted the Hydraulics Online technical team needing assistance with a new product development venture. They had used a tie-rod cylinder within one of their product designs previously and wanted to sample a welded construction hydraulic cylinder instead. The customer ordered 6 of these cylinders which were dispatched next day.

“We placed our first order with you on Thursday of last week. I received a proforma which was paid by us on Friday. The order was delivered direct to our customer by you on Monday… Very good, efficient service!”

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

In the relatively short time that we have been dealing with Hydraulics Online they have become our first choice hydraulic supplier. Their prices are competitive, deliveries on time and advice given honest and fair. We would not hesitate to recommend Hydraulics Online to anyone needing hydraulic spares or advice in this field.

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.

If you’re still not convinced that we’re the right welded hydraulic cylinder supplier for you then there are plenty more examples scattered throughout our library of cases studies and testimonials. We hope to hear from you soon.

Hydraulic Cylinder Design

Looking for a bespoke hydraulic cylinder design service? Look no further…

So you may well have read about the service we provide for hydraulic systems design… but did you know we also offer a hydraulic cylinder design service too?

Hydraulics Online… fast, friendly and competitive but we value them most because they are innovative and can find answers to the really tough hydraulic design problems.

If you’re looking for a bespoke cylinder, our knowledgeable and experienced team can design one tailored specifically to your application, requirements and operating parameters. As long as you know what your end goal is, then we have the hydraulic cylinder design and wider systems expertise to help you achieve it. There’s no minimum order quantity, so if you only need one hydraulic cylinder making that’s fine. Even if your ideas are still on the drawing board our technical team can provide you with an upfront design and outline prices, and then support you through final production and beyond into “business as usual” activities and production.

Not even the toughest of hydraulic cylinder design challenges fazes us, and being able to source all other hydraulic equipment supplies naturally makes us the clear partner for original equipment manufacturers, both large and small alike.

Cylinders

You may be thinking that you need your own hydraulic cylinder design because you haven’t been able to find a standard product that meets your requirements. Maybe we could help? Hydraulics Online has widespread, competitive access to quality, hydraulic cylinder manufacturers worldwide. The key word is quality. Our ISO 9001 accreditation is your guarantee that we will never compromise on quality nor make promises that we can’t keep. Aside from obvious routine servicing and maintenance, we want you to be able to “fit and forget” any equipment we supply.

Our catalogue showcases some of the hydraulic cylinders that we regularly supply including: single and double-acting, welded, tie rod and marine hydraulic cylinders.

But back to hydraulic cylinder design… As an example of some of the projects we’ve undertaken in the past, a procurement services company, to offshore, sub-sea and oil and gas industries, contacted the team for pricing and a detailed specification on a bespoke application needing a through-rod (double-rod) hydraulic cylinder. The design parameters were given for a competitor’s product.

Hydraulics Online quoted for an equivalent custom-made through-rod hydraulic cylinder with exactly the same technical specification, which not only had a much more appealing price tag, but also a swifter lead time for the customer. Needless to say, the customer ordered.

Welded Hydraulic Cylinders

Another customer, a leading product design and manufacturing company within the renewable energy industry overseas, asked our technical engineers for help on a new product development plan. The customer had utilised a tie-rod cylinder within one of their product designs before, but this time they wanted to sample a welded construction hydraulic cylinder design instead. No problem. The cylinders here were custom-made and tailored to the customer’s specification and requirements.

There are plenty more case studies and testimonials to be found throughout our website, spanning all manner of applications… in fact it’s hard to think of an industry, market or corner of the world where we haven’t been involved to date. You name it, we’ve probably done it!

So, if you’ve read this far then hopefully you’re tempted to give Hydraulics Online the chance to quote for your hydraulic cylinder design? You can use our Bespoke Hydraulic Cylinder design form to submit your enquiry details to us … or call us talk things through. We’re always happy to talk.  

Hydraulic

Your one-stop hydraulic resource…

Thanks to our seemingly unrivalled access to a vast range of hydraulic manufacturers from around the world, and our innovative approach to hydraulic problem solving, Hydraulics Online are THE hydraulic supplier that a rapidly increasing number of customers turn to for all their hydraulic equipment and systems design needs.

Large and small alike, our customers frequently rationalise their existing hydraulic supplier base, knowing that the team here can be relied upon to deliver trusted advice and solutions… backed up by reliable deliveries of hydraulic equipment from both well-known and niche hydraulic manufacturers. Hydraulic equipment that, in the nicest possible sense, they can then just “fit and forget”.

Not only that, but our team are fast gaining a reputation for loving a challenge. Straight forward and easy can be boring, right? We like to be kept on our toes. We are regularly tasked with sourcing seemingly obsolete or discontinued hydraulic components and haven’t been beaten yet. Often working to the tightest of budgets and delivering “yesterday”, if an original product isn’t available, or lead times are unworkable, we can offer a direct equivalent or re-manufactured unit.

We like to say that…

If it’s hydraulic we can design it, supply it, solve it or repair it!

That includes: hydraulic pumps, hydraulic motors, hydraulic power packs and units, hydraulic cylinders and rams, hydraulic valves, hydraulic filters and filtration systems, hydraulic accumulators, and hydraulic coolers and accessories for any kind of application in any kind of market – even ATEX rated hydraulic equipment .

As an ISO 9001 accredited business, we don’t just “sell” hydraulics however… unless that’s all you want us to do. We aim to make it our business to understand your business, so that we can be certain we can give you the best hydraulic advice possible and recommend products that really are “fit for purpose”.

Technical advice and assistance was first class and we would not hesitate in contacting you in the future to satisfy our requirements.

So even if you’re not sure what hydraulic product you’re looking for… Let us take the pressure!

It goes without saying that we love all things hydraulic. And, keen as we are to spread the joy and understanding of hydraulic engineering, and believing that prevention is always better than cure we have produced what we hope you will agree is a useful hydraulic reference section.

We add to this on a regular basis but, if you click on the links here you can find:

And finally, based firmly on the belief that prevention is better than cure we have some hints, tips and trouble-shooting guidance for you.

Hydraulics CatalogueWe have never tried, or even thought about trying, to measure the scale of our hydraulic product offering – the number is, however, unquestionably huge! Our online catalogue showcases a very small selection of the products that we supply – we couldn’t possibly squeeze everything that we do in here!

If you’ve read this far and haven’t found or seen mention of the information that you’re looking for then there’s plenty more to see by clicking around on the menu above. But as you’ve no doubt gathered, there’s a lot that can be written about hydraulics – so if you’d rather just talk to one of the team instead, we’d love to hear from you.

Blog & Case Studies

Hydraulics Online, Elon Musk and SpaceX Hyperloop

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Innovative Custom Hydraulics and Systems Design

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Hydraulics Online, Elon Musk and SpaceX Hyperloop

HypED is a University of Edinburgh student-led project that is blazing a successful path for British engineers in Elon Musk’s SpaceX Hyperloop project – and […]

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We invest time and energy to build great relationships with our suppliers as well as our customers. Fluidlink Hydraulics is a British manufacturer of mobile hydraulic […]