301 (seat shell)

One bad gas lift cylinder can turn a profitable chair shipment into a warranty disaster. Buyers who skip third-party verification routinely find that a "quality" cylinder starts leaking, loses height, or fails load tes...

Two numbers decide whether a 30,000-unit chair program ships on schedule: the glass-fill shrinkage allowance on a molded back frame, and the datum scheme on a 350 mm five-star base. Leave either one out of your chair c...

A five-star office chair base can pass a supplier's in-house drop test and still fail within 18 months of daily use. The gap is test definition, not material quality: factory checks load a base in one direction, while ...

An office chair gas spring is a sealed cylinder pressurized with nitrogen to roughly 150 bar. When the rod seal fails, the seat drops to its lowest travel in under one second with no audible warning. That failure mode ...