HM
Herman Miller
Cosm
Herman Miller · 2018–Present
Cosm
Auto-Harmonic tilt and continuous suspension—instant fit with almost no knobs.
350 lb capacity5'0"–6'3"Elastomer3D
Where to buy
Typical prices — new ~$1,695, refurbished ~$900, used ~$550.
Fit calculator
Optional body inputs to gauge whether this chair’s published height range and weight capacity cover you.
5'0"Chair height envelope6'3"
Likely fit — height within published range and weight under 350 lb capacity.
Spec sheet
- Typical configuration
- Mid-back work chair with Leaf Arms
- Era produced
- 2018–Present
- Discontinued
- No
- Approx. MSRP (new)
- $1,695
- Typical refurbished price
- $900
- Typical used price
- $550
- Height range
- 5'0" – 6'3"
- Weight capacity
- 350 lbs
- Seat width
- 20"
- Seat depth
- 17"
- Backrest height
- 24"
- Seat material
- Elastomer
- Armrest type
- 3D
- Arm adjustability
- Leaf arms, height-adjustable, fixed, or armless depending on config
- Forward tilt
- No
- Lumbar
- Integrated
- Headrest
- None
- Cylinder
- Top-activated pneumatic (~16.4"–20.9" seat height typical)
- Caster stem
- 11mm × 22mm standard
- Frame
- Flexible polymer frame + elastomeric Intercept suspension
- Tilt / lock
- Auto-Harmonic tilt (automatic balance; minimal manual dials)
Revision matrix & serial tag guide
Serial tag location: Underside of seat; Cosm is identified by continuous Intercept suspension seat-to-back.
| Year | Version | Changes |
|---|---|---|
| 2018 | Launch | Auto-Harmonic tilt, Intercept suspension, low/mid/high back, Leaf Arms option. |
Aftermarket & replacement parts
Compatible cylinder type: Top-activated pneumatic (~16.4"–20.9" seat height typical). Caster stem: 11mm × 22mm standard. Headrest availability: None.
Spec notes
- Often cited around 5'0"–6'3"; typically covers roughly the 5th–95th percentile.
- Seat width and depth are approximate for common configurations.
- Leaf arms are not full 4D articulating arms.
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