Welded Hydraulic Cylinders

• Piston rod construction: The piston rod of a hydraulic cylinder functions both inside and outside the barrel, therefore also functioning both in and out of the hydraulic fluid and surrounding atmosphere.
• Metallic coatings: Smooth and hard surfaces are necessary 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.

Hydraulics 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.

Our own 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.

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.

A 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. After working with the customer to specify their exact requirements, they ordered 6 of these cylinders which were then dispatched the following day.

We have plenty more examples scattered throughout our library of case studies and testimonials. We hope to hear from you soon.