Gas Lift Cylinder for Office Chairs - Specifications and Selection

Product Specifications

Technical details and manufacturing context for Gas Lift Cylinder

Definition

A gas lift cylinder is a key component in ergonomic office chairs that enables smooth, controlled vertical adjustment of the seat height. It uses compressed nitrogen gas and hydraulic oil to provide resistance-free height adjustment while supporting the user's weight. This component is essential for creating personalized seating positions that promote proper posture and comfort during extended work periods. The cylinder typically consists of a steel or aluminum alloy outer tube, a piston rod, and internal seals made of nitrile rubber. The operating pressure ranges from 1.0 to 1.6 MPa, with a stroke length of 60 to 200 mm, and a lifting force of 100 to 300 N. The seat height adjustment range is typically 80 to 200 mm, and the cylinder diameter varies from 25 to 50 mm. It operates within a temperature range of -20 to 60 °C, and has a load capacity of 100 to 250 kg. The cycle life is rated at 50,000 to 100,000 adjustments, with a leakage rate of ≤0.1 mL/min at rated pressure. The surface finish is Ra 0.2 to 0.4 μm, and the weight ranges from 0.5 to 1.5 kg. These values are reference ranges; actual specifications must be confirmed with the manufacturer for a specific model. The cylinder is designed to meet standards such as EN 1335 for office furniture safety and durability. Proper selection requires consideration of the user's weight, desired seat height range, and mounting dimensions. Regular maintenance includes checking for leaks and ensuring smooth operation. Signs of failure include sudden drops, inability to hold height, or excessive noise. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The gas lift cylinder operates on a pneumatic-hydraulic principle. When the release lever is activated, it opens a valve that allows compressed nitrogen gas to expand, pushing a piston upward and raising the chair. When the lever is released, the valve closes, locking the cylinder at the desired height. The hydraulic oil provides damping control for smooth movement and prevents sudden drops.

Common Materials

Steel, Aluminum alloy, Nitrile rubber seals, Hydraulic oil, Compressed nitrogen gas

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stroke Length	60–200 mm	Determines seat height range
Lifting Force	100–300 N	Must support user weight
Seat Height Adjustment Range	80–200 mm	Typical office chair range
Cylinder Diameter	25–50 mm	Affects strength and fit
Operating Temperature	-20–60 °C	Outside this range performance degrades
Load Capacity	100–250 kg	Maximum static loadEN 1335
Cycle Life	50000–100000 cycles	Minimum number of height adjustmentsEN 1335
Leakage Rate	≤0.1 mL/min	At rated pressureISO 5208
Surface Finish	Ra 0.2–0.4 μm	For sealing and smooth operation
Weight	0.5–1.5 kg	Depends on size and material

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

Outer Cylinder Tube Part
Houses the internal components and provides structural support

Material: Steel
Piston Rod Part
Extends and retracts to adjust chair height, transfers user weight

Material: Chrome-plated steel
Piston Part
Separates gas and oil chambers, creates pressure differential for movement

Material: Aluminum alloy
Seals and O-rings Part
Prevent gas and oil leakage, maintain pressure integrity

Material: Nitrile rubber
Release Valve
Controls gas flow to enable height adjustment when activated

Material: Brass
End Fittings Part
Connect the cylinder to chair base and seat mechanism

Material: Steel
Compressed Nitrogen
The gas charge itself; its pressure sets the lift force and the stroke feel.
Hydraulic Oil
Damps the motion so the chair does not drop suddenly.

Manufacturers of Gas Lift Cylinder

Manufacturer profiles associated with Gas Lift Cylinder.

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Frequently Asked Questions

What is the typical operating pressure range for a gas lift cylinder?

The typical operating pressure range is 1.0 to 1.6 MPa. Always confirm the exact pressure rating with the manufacturer for your specific model.

How do I choose the right gas lift cylinder for my office chair?

Consider the user's weight (load capacity 100-250 kg), desired seat height adjustment range (80-200 mm), stroke length (60-200 mm), and mounting dimensions. Also check the operating temperature range (-20 to 60 °C) and cycle life (50,000-100,000 adjustments). Verify all specifications with the supplier.

What maintenance does a gas lift cylinder require?

Regularly inspect for oil leaks, ensure smooth operation, and check that the cylinder holds height without drifting. Clean the piston rod and seals as needed. If you notice sudden drops or inability to lock, the cylinder may need replacement.

What standards apply to gas lift cylinders?

Relevant standards include EN 1335 for office furniture safety and durability. These standards provide reference for verification, but compliance must be confirmed with the manufacturer or supplier.

Data Basis

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pressure:	Max 250 psi (17.2 bar)
other spec:	Flow rate: 0.5-2.0 L/min, No slurry concentration (clean dry air only)
temperature:	-10°C to 60°C

Gas Lift Cylinder

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards