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Black carbon steel ring clamp with 25mm inner diameter, 45mm outer diameter, 15mm thick, includes small Allen wrench

AUTO-VOX Gas Lift Cylinder Stopper 25mm Coupling

SKU CH-S4TR-ZP5Z2

A 25 mm solid carbon-steel clamp locks a sinking office or gaming chair at the desired height using dual screws and the included Allen wrench, with no cylinder removal required

  • Tube Size25mm-1P
  • Size/Dimensions1.7 in x 1.7 in x 0.59 in
  • Locks chair at chosen height with dual-screw clamp
  • Fits standard 25mm cylinders on most office and gaming chairs
  • Installs in minutes using supplied wrench without removing cylinder
  • Solid carbon steel construction resists wear and handles heavy loads
  • Black corrosion-resistant coating protects finish during storage and use

Universal 25mm Cylinder Stopper

The AUTO-VOX stopper clamps onto a standard 25mm gas-lift cylinder and locks an office, gaming or executive chair at a chosen height. Solid carbon steel construction replaces failed pneumatic seals without removing the cylinder or disassembling the seat. A 7.7 cm Allen wrench is included for the dual-screw clamp, so the repair takes minutes at home or in a commercial workspace.

Capacity and Headroom

Inner diameter 25mm, outer diameter 45mm and 15mm thickness give a rigid collar that resists the axial force of a seated adult. The heavy-duty steel body handles daily height adjustments and continuous load without the creep common to plastic split-ring fixes. It will not restore lost pneumatic lift; if the cylinder no longer holds any pressure the chair stays at the locked height only.

Upgrade From Temporary Fixes

Replaces tape wraps, hose clamps, plastic collars or makeshift shims that slip under load. The jump is worth it when the chair sinks repeatedly and a permanent, tool-free mechanical lock is preferred over cylinder replacement. Not for chairs with non-standard cylinder diameters, integrated seat mechanisms that block clamp access, or users who need the original pneumatic height adjustment restored.

Highlights

  • Locks chair at chosen height with dual-screw clamp
  • Fits standard 25mm cylinders on most office and gaming chairs
  • Installs in minutes using supplied wrench without removing cylinder
  • Solid carbon steel construction resists wear and handles heavy loads
  • Black corrosion-resistant coating protects finish during storage and use

Specifications

Tube Size25mm-1P
Size/Dimensions1.7 in x 1.7 in x 0.59 in
BrandAUTO-VOX
ModelHand Rivet Nut Setter Kit

Questions about this item

Will this 25 mm clamp fit around the cylinder on my existing office chair without removing the base?

Yes, the stopper is designed for 25 mm inner-diameter cylinders and installs with the included Allen wrench while the cylinder stays in place.

How can I verify the height lock is holding after I tighten the dual screws?

Sit in the chair and apply your full weight; the seat should stay at the set height with no gradual drop, confirming the carbon-steel clamp is gripping securely.

Does the package contain everything needed for installation, or do I need extra tools?

The box includes one black carbon-steel stopper (inner diameter 25 mm, outer diameter 45 mm, thickness 15 mm) and a 7.7 cm Allen wrench — no other tools are required.

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