The way a cylinder’s end cap connects to the tube affects repairability, pressure capacity, and overall dimensions. For dump truck cylinders, garbage truck cylinders, construction machinery cylinders, and agricultural machinery cylinders, choosing the right connection type matters. Even on our large custom cylinders, where we use premium materials throughout, the connection design remains a key decision point.
Threaded connection
Threaded end caps screw directly into the cylinder tube. This design is compact with no external fasteners, making it ideal for applications with tight mounting space. Threaded connections handle very high pressures well because there are no bolt holes to weaken the structure. The main drawback is disassembly—special tools are required, and repeated removal can damage threads. Construction machinery cylinders often use threaded connections where high pressure and compact size are priorities. For cylinders that rarely need service, threaded is an excellent choice.
Flanged connection
Flanged end caps use a bolted flange to secure the cap to the tube. This design offers easy disassembly for maintenance and excellent pressure capability. The trade-off is larger radial dimensions and higher weight. Dump truck lift cylinders sometimes use flanged heads on the piston rod side for easier seal replacement. Flanged connections are also common on large custom cylinders because they allow field servicing without special tools. The bolts themselves must be high-strength—we use premium graded bolts on every flanged cylinder we build.
Tie-rod connection
Tie-rod cylinders use long rods running the length of the tube to hold both end caps together. This design is extremely service-friendly—you can disassemble the entire cylinder with basic hand tools. Parts are widely interchangeable. However, tie-rods are prone to loosening under vibration, the external rods take up space, and they can corrode in harsh environments. Agricultural machinery cylinders often use tie-rod construction because farmers need simple, field-serviceable designs. For garbage truck cylinders exposed to corrosive waste, tie-rods require regular inspection and occasional retorquing.
Which one should you choose?
There is no single best connection type. Threaded connections excel in high-pressure, compact, low-service applications. Flanged connections balance serviceability and strength, making them ideal for large custom cylinders. Tie-rod connections offer unmatched service access but require more attention to bolt torque and corrosion protection. When you order cylinders from us, we will recommend the connection type based on your pressure requirements, available space, and expected maintenance frequency. Every connection uses premium fasteners and precision-machined sealing surfaces—because how a cylinder goes together matters as much as what goes inside it.