Rod Gland/End Cap for Hydraulic & Pneumatic Cylinders

Product Specifications

Technical details and manufacturing context for Rod Gland/End Cap

Definition

The rod gland or end cap is a critical component of lift cylinders and actuators that serves as the termination point for the piston rod. It provides a sealed interface between the moving rod and the stationary cylinder housing, preventing fluid leakage while maintaining structural integrity under pressure and load conditions. This component is typically machined from carbon steel, stainless steel, or aluminum alloy, depending on the application requirements for strength, corrosion resistance, and weight. The rod gland houses rod seals such as O-rings, U-cups, or wipers, which maintain pressure within the cylinder while allowing the rod to extend and retract. It also acts as a bearing surface for the rod, providing alignment and reducing wear. Key parameters for selection include cylinder bore diameter (40–320 mm per ISO 6020-2), rod diameter (20–220 mm per ISO 6195), operating temperature (-20–80 °C per ISO 5598), surface roughness of the seal groove (0.2–0.4 μm Ra per ISO 4287), bore diameter tolerance (H8–H11 per ISO 286-2), material grade (e.g., aluminum alloy 6061-T6 per ASTM B221), and weight (0.5–15 kg). These values are reference ranges and must be verified for the specific model and application. Standards listed are procurement references, not certifications. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The rod gland/end cap creates a sealed chamber by housing rod seals (such as O-rings, U-cups, or wipers) that maintain pressure within the cylinder while allowing the rod to extend and retract. It also serves as a bearing surface for the rod, providing alignment and reducing wear. The seal arrangement prevents fluid leakage between the moving rod and the stationary housing, ensuring efficient operation under varying pressure and temperature conditions. Proper surface finish and tolerances are critical for seal life and performance.

Common Materials

Carbon Steel, Stainless Steel, Aluminum Alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cylinder Bore Diameter	40–320 mm	Standard sizes per ISO 6020-2ISO 6020-2
Rod Diameter	20–220 mm	Must match rod seal sizeISO 6195
Operating Temperature	-20–80 °C	Seal material limitsISO 5598
Surface Roughness (Seal Groove)	0.2–0.4 μm Ra	Critical for seal lifeISO 4287
Tolerance (Bore Diameter)	H8–H11 ISO 286	H8 for high precision, H11 for generalISO 286-2
Material Grade	6061-T6 Al alloy	Corrosion resistant, lightweightASTM B221
Weight	0.5–15 kg	Depends on size

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Rod Seal Part
Primary sealing element that prevents fluid leakage along the rod

Material: Nitrile Rubber, Polyurethane, or PTFE
Wiper Seal Part
Removes contaminants from the rod as it retracts

Material: Polyurethane or Rubber
Bearing/Bushing Part
Supports and guides the rod, reducing friction and wear

Material: Bronze, Steel, or Composite Polymer
Retaining Ring/Groove Part
Secures the seals and bearing components in place

Material: Steel
Gland Housing
The body the seals and bushing sit in, and the part that bolts to the cylinder end.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Lift Cylinder / Actuator

View system integration details

Manufacturers of Rod Gland/End Cap

Manufacturer profiles associated with Rod Gland/End Cap.

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Frequently Asked Questions

What is the function of a rod gland/end cap?

It terminates the piston rod, provides a sealed interface between the moving rod and stationary housing, prevents fluid leakage, and maintains structural integrity under pressure and load.

What materials are commonly used?

Carbon steel, stainless steel, and aluminum alloy (e.g., 6061-T6) are typical, chosen based on strength, corrosion resistance, and weight requirements.

What parameters should be verified before selection?

Operating pressure, cylinder bore diameter, rod diameter, temperature range, surface roughness, tolerances, material grade, and weight. These must match the specific application and be confirmed with the manufacturer.

How does the rod gland affect seal life?

Surface roughness of the seal groove (0.2–0.4 μm Ra) and bore diameter tolerance (H8–H11) are critical. Improper finish or tolerance can cause premature seal wear or leakage.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 500 bar (hydraulic), up to 16 bar (pneumatic)
rod speed:	Up to 1.5 m/s (continuous), 3.0 m/s (peak)
temperature:	-40°C to +120°C (standard elastomers), up to +200°C with specialty materials
environmental class:	IP65/IP67 standard, higher ratings available

Rod Gland/End Cap

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards