21" diameter replacement chair or stool base. Heavy duty aluminum alloy. Available polished or black. Ideal for office and medical environments.

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Lightweight and robust die-cast aluminum chair base is polished to a high shine. Manufactured for strength, durability and appearance. Ideal for office and medical environments.


  • Aluminum alloy.
  • Standard 2" (50mm) center hole to receive standard chair gas cylinders. Older chairs and some imports may be different.
  • Diameter 2.36" (540 mm).
  • Standard 7/16"x7/8" (11mm x 25mm) caster socket holes to receive standard grip-ring caster mounting stems.
  • 2.5" overall height of base.
  • Weight rating: 250 pounds.
  • Meets BIFMA standards.
  • Compatible with Salli Saddle Chair, Bambach Saddle Seat, and other chairs with 50mm pneumatic cylinders.


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Heavy-Duty Alloy Chair Base, 21" | 540mm
Brand: Salli Systems
Item #: 4120-SS-540
Our Price: $76.00