SKF
Guide Rings and Guide Strips
SKF guide rings and guide strips are non-metallic bearing elements that support the piston and rod within the hydraulic cylinder, carrying the transverse (side) loads and preventing metal-to-metal contact between the piston and bore, or rod and cylinder head. Made from fabric-reinforced thermoplastics, PTFE compounds, or specially formulated polyesters, they provide low friction, high compressive strength, and excellent wear resistance. Guide rings absorb radial forces from misalignment, load angles, and structural deflection, protecting the seals from eccentric wear and preventing scoring of the cylinder bore and rod. They are essential for long cylinder life and smooth operation. SKF supplies guide rings and cut-to-length guide strips in a comprehensive range of sizes and materials. Correct guide ring selection maintains the seal’s extrusion gap and ensures uniform load distribution.
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Prevents Metal-to-Metal Contact
Eliminates scoring and galling of cylinder components.
High Compressive Strength
Supports heavy side loads without deformation.
Low Friction Materials
Fabric-reinforced phenolics and PTFE compounds reduce stick-slip.
Absorbs Misalignment
Protects seals from eccentric wear.
Customisable Length
Guide strips can be cut to fit any cylinder diameter.
Wide Temperature and Fluid Compatibility
Suitable for all common hydraulic fluids.
Guide Rings vs. Guide Strips: Which to Use?
Guide rings are pre-formed circular rings that slip onto the piston or into the gland. They are convenient for standard cylinder sizes. Guide strips are supplied in lengths that can be cut and formed to custom diameters, ideal for non-standard or large-bore cylinders. SKF’s range covers both options.
Material Selection for Guide Rings in High-Load Cylinders
For very high side loads (e.g., articulated dump truck steering cylinders), fabric-reinforced phenolic guide rings offer the highest compressive strength and dimensional stability. For lighter loads and higher speeds, PTFE-based guides provide lower friction and better compatibility with fire-resistant fluids.