How is office chair gas lift stroke calculated?

For the common SMT reference models, nominal stroke is the difference between extended length and compressed length. For example, 356 mm extended length minus 256 mm compressed length equals 100 mm nominal stroke.

Which gas lift stroke is commonly used for standard office chairs?

80 mm and 100 mm strokes are common starting points for standard office chair programs. The final choice depends on chair geometry, base height, mechanism interface and target seating height.

Can rod and outer tube thickness be changed?

Yes. Samiktech can discuss 2.0 mm or 2.5 mm carbonized rod options and 1.2 mm or 1.5 mm outer tube wall options according to the buyer's class, strength and cost requirements.

Home / Products / Size chart

Office chair gas lift size chart for 60mm, 80mm, 100mm and 120mm strokes.

Use this chart to compare common SMT office chair gas lift dimensions before requesting a quotation. Final production should be confirmed by drawing, sample and certificate scope.

Technical reference

Start with stroke, then confirm extended and compressed length.

For height-adjustable office chairs, the stroke alone is not enough. Buyers should also confirm extended length, compressed length, outer tube length, tube interface and force target.

Common strokes60 / 80 / 100 / 120 mm

Outer tube ODØ50 reference

FinishQPQ black / chrome options

Size chart

Common SMT office chair gas lift dimensions.

The values below are practical drawing and quotation references for common office chair gas lift inquiries. Actual model approval depends on the buyer's drawing or sample.

Reference model	Nominal stroke	Extended length	Compressed length	Outer tube length	Outer tube OD	Typical use
SMT 60mm stroke	60 mm	276 mm	214 mm	165 mm	Ø50	Short travel task chair or low office chair
SMT 80mm stroke	80 mm	313 mm	233 mm	185 mm	Ø50	Standard office chair
SMT 100mm stroke	100 mm	356 mm	256 mm	205 mm	Ø50	Mainstream office chair or executive chair
SMT 120mm stroke	120 mm	396 mm	276 mm	225 mm	Ø50	Taller office chair or wider height adjustment range

Configuration options

Rod and tube choices change strength, cost and application fit.

When comparing Class 3 and Class 4 gas lift quotations, buyers should identify the rod and outer tube route instead of comparing only by class name.

Configuration	Rod option	Outer tube wall	Buyer note
Standard configuration	2.0 mm carbonized rod	1.2 mm	Base configuration for regular office chair programs.
Thicker outer tube	2.0 mm carbonized rod	1.5 mm	Used when stronger outer tube support is required.
Stronger rod	2.5 mm carbonized rod	1.2 mm	Often discussed for repair or stronger replacement demand.
Heavy-duty option	2.5 mm carbonized rod	1.5 mm	Combines stronger rod and thicker outer tube.

FAQ

Common questions about office chair gas lift dimensions.

Is 60mm stroke too short?

It is suitable for shorter travel requirements, compact chairs or low office chair designs. Confirm full chair height before choosing it.

100

Why is 100mm common?

100mm offers a practical height adjustment window for many mainstream office and executive chair programs.

Why check extended length?

Extended length affects final seat height and assembly geometry. It should be checked with the chair base and mechanism.

Why check compressed length?

Compressed length influences the lowest seating position and whether the gas lift fits into the chair structure.

Need a gas lift size matched to your chair drawing?

Send dimensions to Samiktech →