Hydraulic Cylinders Built for the Toughest Conditions
Quality Manufacturing Since 1990
RHK designs and manufactures a wide array of hydraulic cylinders. A welded design cylinder is popular for both its durability and serviceability.
RHK’s technical sales and engineering teams have extensive experience designing cylinders from a set of specifications or even a conceptual idea
Designed and Manufactured to your Requirements
RHK’s sales and engineering team has extensive experience designing cylinders from a set of specifications or even a conceptual idea. Let us engineer a design to your specific application.
- Custom Bore Size, Stroke length and lifting capacity
- Custom Mounting Configuration (see below)
- Threaded/Bolted Gland
- Welded/Threaded/Bolted Endcap
- Counterbalance, Pilot Operated Check Valves
- Porting options (ORB, NPT, C61) and location
- Custom Paint to your spec
Custom Design and Engineering
RHK is a leader in custom manufacturing of all types of hydraulic cylinders. We manufacture single or multi-stage cylinders, single or double acting. All products are engineered to meet safety, material strength, and load capacity guidelines. Additionally, all manufacturing processes are done in-house.
Our engineering and applications team will work closely with you, the customer to understand your specifications, requirements and applications. RHK will create designs, manufacture, inspect and deliver within the timeframe which ensures consistent high-quality cylinders to the marketplace. All cylinders are designed, built and tested as per API standards and follow ISO 9001:2015 standards.
Manufactured with Pride
Driven by Continuous Improvement
RHK’s versatile manufacturing process accommodates low and high volume orders of varying sized cylinders. Every component is rigorously measured, tested and held to RHK’s Quality Assurance program. Using ERP software progress is monitored ensuring every order is fulfilled accurately and on time.
Once assembled and tested, completed cylinders are primed light grey for rust protection while in transport. Full painting services are also available.
Single Stage Cylinder Worksheet
Use this sheet to help design a custom cylinder and obtain a quote. Not all specs are required but the more information provided, the better.
Mounting Connections
Here is a list of typical mounting connections. For custom mounting options, get in touch!
Cross Tube
Clevis
Clevis – Threaded
Lug
Lug w/Spherical
Plane Bearing
Trunnion
Flange – Round
Flange – Square
Hole Thru
Threaded – Male
Threaded – Female
Radius
Welded Design Cylinders FAQs
What is the difference between welded cylinders and tie-rod cylinders?
Both welded and tie-rod cylinders are common hydraulic cylinder types that differ in endcap design. Welded cylinders feature an endcap welded to the barrel, while the endcap of a tie-rod cylinder is held on with tie-rods that run the length of the cylinder. Although a tie-rod cylinder can be easier to service, a welded cylinder generally takes up less space, can handle higher operating pressures and withstands harsher environments.
Is it possible to rebuild a welded hydraulic cylinder?
Absolutely. A welded cylinder typically features a welded endcap and a threaded or bolted gland, allowing for ease of disassembly and service. Occasionally we come across cylinders that are welded on both ends, and the cylinder is rebuildable, but must be machined apart to be rebuilt.
What are the common causes of welded cylinder failure?
The most common causes of welded cylinder failure are:
- Fluid Contamination: Foreign particles in the hydraulic fluid can scratch the cylinder bore and cause corrosion.
- Side Loading: When an external force is applied perpendicular to the cylinder, it creates wear. Excessive side loading can cause a bent or broken rod.
- Rough or Scored Rod: A scored rod will damage the seals, causing difficulty to maintain pressure, reduce life, and require frequent replacement.
- Over-Pressurizing: Repeatedly handling more pressure than it is designed for causes snap rings to dislodge and becomes dangerous to operate.