Cast Iron Cylinder Guide Bushing for Hydraulic Applications
Product Introduction
Cast Iron Cylinder Guide Bushing is a heavy-duty hydraulic cylinder component engineered to perform reliably under extreme mechanical stress, heavy side loads, and dirty working conditions. This guide bushing is made from high-strength grey cast iron or ductile cast iron such as HT200, HT250, or QT450-10, materials renowned for their excellent compressive strength, thermal stability, and wear resistance.
Designed to guide and support the piston rod inside the hydraulic cylinder, the cast iron bushing absorbs lateral loads while maintaining axial alignment. This prevents rod deflection, protects seals from damage, and prolongs the overall life of the hydraulic system.
Product Description
The cylinder guide sleeve plays a guiding and supporting role on the piston rod, which requires high matching precision, small friction resistance, good wear resistance, and can withstand the pressure, bending force and impact vibration of the piston rod. The inside is equipped with a sealing device to ensure that the cylinder is sealed by the rod cavity, and the outside is equipped with a dust ring to prevent impurities, dust and moisture from being brought to the sealing device and damaging the seal.
Metal guide sets are generally made of bronze, gray cast iron, nodular cast iron and oxidized cast iron with small friction coefficient and good wear resistance; Non-metal guide sleeve can be made of polytetrafluoroethylene and polytrifluorochloroethylene, etc.
Product parameters
| Product Name | Cylinder Guide Sleeve / Hydraulic Rod Guide Bushing |
| Application | Hydraulic Cylinders – Construction, Industrial |
| Steel Grade | 42CrMo/SCM440/4140, 40Cr, 20CrMnTi, C45/S45C,HT200/HT250,QT450,CuSn8 |
| Outer Diameter (OD) | 20-30μm(min |
| Inner Diameter (ID) | 850HV(min) |
| Length | Ra0.2um(max |
| Tolerance (OD/ID) | ≥350 Mpa |
| Hardness | HB 90–130 (bronze) / HRC 45–55 (hardened steel) / HB 170–250 (cast iron) |
| Customization | Material, dimensions, tolerances, grooves, surface finish |
| Common Standards | ISO 3320, ISO 6020-2, DIN 24336, customer drawing |
| Lubrication Feature | Optional oil groove, grease hole, self-lubricating surface (PTFE/bronze) |
| Surface Treatment Options | 1.Phosphating |
| 2.Black Oxide | |
| 3.Quenched | |
| 4.Painted |
Product Applications
> Mining machinery and hydraulic equipment
> Construction cylinders and ground-moving systems
> Marine deck machinery
> Steel industry hydraulic presses
> Tractors and agriculture machines
Product Display
Inspection and packaging drawings
| Keywords
Designed to guide and support the piston rod inside the hydraulic cylinder, the cast iron bushing absorbs lateral loads while maintaining axial alignment. This prevents rod deflection, protects seals from damage, and prolongs the overall life of the hydraulic system.