Office chairs
Office Chair Gas Lift Cylinder Replacement — Class 4, 3.9" Stroke
Product description
This replacement gas lift includes a single Class 4 office chair cylinder engineered for extended travel and daily use. The unit provides a 3.9-inch (100 mm) stroke, giving a usable seat height range of approximately 9.7" to 13.6" (245–345 mm) so you can match your preferred seating position. Before purchasing, measure your existing cylinder to confirm compatibility with the stated dimensions.
The outer tube measures the common 2" (50 mm) diameter, the piston rod is about 1.1" (28 mm) across, and the tapered mounting base is roughly 1.77" (45 mm). Built from reinforced steel, the assembly is certified to Class 4 strength and has passed independent SGS and BIFMA tests. The manufacturer rates the lift to support loads up to 1000 lb (450 kg), offering increased stability and longevity compared with lower-class cylinders.
A sealed hydraulic pneumatic mechanism provides smooth, quiet lift and descent, while the anti-explosion safety design adds protection against sudden failures. The cylinder allows full 360° rotation without wobble, and it operates only when the adjustment control is engaged for reliable performance during normal use.
Installation is straightforward: the worn cylinder can be removed and the new unit installed quickly without specialized assembly, restoring chair height and function in minutes. The heavy-duty construction aims to deliver long-term service and extend the life of your existing chair instead of requiring a full replacement.
Pros
- Wide 3.9" stroke for significant height adjustment
- Class 4, SGS and BIFMA tested with high load rating
- Smooth, quiet operation with anti-explosion safety
Cons
- Must confirm measurements before ordering
- May require basic tools to remove an old, stuck cylinder
- Tapered base may not match every nonstandard chair
VerdictA rugged Class 4 replacement cylinder that restores chair functionality and offers a large adjustable range. It uses common mounting sizes so it fits most office, executive and gaming chairs, and its reinforced-steel build and third-party testing support high weight limits. The unit delivers quiet, steady height changes and full swivel motion, and can be installed in minutes without complex assemb
Reviews
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María 4/5
La boquilla más ancha no sirve para inflables
Funciona bien, pero no incluye un juego de boquillas útil para colchones o piscinas infantiles. Debería traer una boquilla mayor para esos usos, ya que la que muestra el vendedor no encaja con artículos de gran tamaño.
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GRANDPA - THE OLD GUY !! 5/5
Performs reliably
Works perfectly. Very easy to fit.
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HeatherBee 5/5
Added the extra lift I needed
Fitted this to a standard chair to gain a bit more height and it worked wonderfully. Simple install and reliable adjustment.
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bgill 5/5
Solved my height issue
I ordered a replacement because my chair wouldn’t reach the listed 22.5" and only topped out near 20". This cylinder matched the measurements and dropped in after a quick swap. Now I can raise the seat to a comfortable height.
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Alessandrograssano005 5/5
Prodotto valido
È un buon ricambio per chi vuole sostituire il pistone usurato; lo consiglio, voto 10.
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Metroknight 5/5
Sturdy and simple swap
Good fix for a sinking chair. Replacing the cylinder took only a few minutes and the seat now holds my chosen height. The unit feels well made and durable—worth getting if your lift is failing.
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STEVE! 5/5
Straightforward replacement
The original cylinder failed and this was an inexpensive, fast fix. It slid into place, works smoothly, and I use the lowest setting at my desk. Seems solid for ordinary use and holds the chair well. Would recommend.
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Casey 5/5
Easy way to revive an old chair
My chair’s cylinder failed after years of use, and swapping this one in brought it back to life. You will need some tools to extract a stubborn old piston, but once removed installation is simple. It’s solid, supports high loads, and only moves when the release is pressed.
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ESTARLIN LOPEZ 5/5
Excelente calidad
Muy buenos.
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J K 5/5
Saved a costly chair
My beloved memory-foam chair had a broken weld and the old cylinder was fused in place. I had to destroy the original to free the collar, reattach the coupler, and this replacement fit almost exactly. After a small cable adjustment to the actuator, the chair works like new and I avoided a very expensive replacement.
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