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Office Chair Caster Replacement Matcher

Match replacement chair casters by stem diameter, stem length, hub bore, and the class of chair, and avoid the trap of a bigger wheel that makes the chair unstable.

A chair caster is matched as a whole: the stem, its length, the hub bore, the tread, and the class of chair all have to agree. Enter the measurements from the old caster and the user’s weight, and the calculator returns the matching sizes and the floor suitability.

The tool also flags the common mistake. A larger wheel raises the seat, changes the geometry, and makes the chair less stable at the same time, so the size that matches the chair is the size to keep. Thread pitch still has to be checked by hand.

Inputs

Measured caster

Range: 0.25–1.25 in

Measure the stem that plugs into the chair base. 7/16 in and 5/8 in are the most common; 7/8 in appears on heavier task chairs.

Range: 0.2–2.5 in

The threaded portion that goes into the base plate, measured from the top of the caster hub.

Range: 0.1–0.75 in

Chair and floor

Range: 50–500 lb

Result

Stem class
Standard stem class. This is the 5/8 in stem used on the majority of office and task chairs, and replacements for it are widely stocked.
Stem length check
The stem length is proportionate to the stem diameter, which is the usual arrangement.
Tread for this floor
On carpet, use a hard or semi-soft wheel: a soft tread sinks into the pile and makes the chair hard to move.
Load and chair class
At this weight and chair class, the dimension match is the main requirement; a light-duty office caster is adequate.
Wheel diameter caution
Keeping the same wheel diameter as the original preserves the seat height and the chair's stability.

What to check

  • Measure the stem length as it sits in the chair socket.
  • Keep the original wheel diameter unless the seat height is being changed deliberately.
  • Check the thread pitch with a gauge before ordering.

Related calculators

A dimensional matching aid, not a parts database, so it cannot confirm that a replacement is in stock or that a given part number fits. Thread pitch is not measured and must be checked by the user, and the wheel diameter the user intends to fit is not compared against the original, so the rule is given rather than the comparison.