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Onyx 24 Hour Posture Bonded Leather Office Chairs
The Onyx chair is a fresh, contemporary office chair that offers a range of inspired features such as a multi-functional asynchronous mechanism with multiple adjustments and a contoured foam seat and back for extra support and comfort.
- Upholstered in black bonded leather.
- Available with or without headrest.
- Seat pad with sloping waterfall front, removes pressure on the back of the legs to improve circulation and posture.
- Reclining lock tilt mechanism is designed to keep the backrest in permanent contact with the body and is lockable in the upright position.
- Torsion control sets the backrest resistance supporting each user perfectly throughout the recline.
- Once the torsion is adjusted for your bodyweight, use the chair in free float mode for a more ergonomic experience.
- The backrest has ratchet height adjustability to ensure the lumbar support is positioned at the small of the back.
- Onyx sports an extra high backrest carefully contoured for maximum ergonomic comfort and support.
- Lumbar support via an inflatable airbag in the backrest can be adjusted to accommodate each user.
- Stylised angular aluminium five star base with twin wheel castors to allow freedom of movement.
- Gas assisted seat height adjusts the chair so the feet are planted firmly on the ground. Thighs should be angled slightly downward for optimum support.
- The seat slides in and out, adjusting the seat depth to fit to your body and legs. Perfect for taller sitters.
- Tip! Leave a three finger gap between the front of the seat and the back of your knees.
- Height adjustable arms fit any user and provide forearm support helping to prevent RSI.
- Tested for users up to 135kg and for use up to 24 hours a day.
- To give you confidence in this product, moving parts are guaranteed for 5 years and upholstery for 2 years. This excludes fair wear and tear.
Standard Features
![5 Year Guarantee](/media/img/shop/pfi/026304.png?v5)
5 Year Guarantee
To give you confidence in this product, it is guaranteed for 5 years.
![135Kg Weight Capacity](/media/img/shop/pfi/023346.png?v4)
135Kg Weight Capacity
Suitable for users up to 135Kg (21.25 stones).
![24 Hour Usage](/media/img/shop/pfi/023322.png?v4)
24 Hour Usage
Suitable for use up to 24 hours a day, 5 days a week.
![Adjustable Lumbar Support](/media/img/shop/pfi/023306.png?v5)
Adjustable Lumbar Support
Personalised lumbar support for a more tailored experience.
![Forward Tilt](/media/img/shop/pfi/023314.png?v5)
Forward Tilt
This mechanism adjusts the angle of the seat and the front of the seat can be tilted up and down.
![Gas Lift Adjustment](/media/img/shop/pfi/023299.png?v5)
Gas Lift Adjustment
Adjusts the seat height to the perfect setting for each sitter.
![Height Adjustable Backrest](/media/img/shop/pfi/023297.png?v5)
Height Adjustable Backrest
Adjusts the backrest height to position support in the right place.
![Independent Back Tilt](/media/img/shop/pfi/023312.png?v5)
Independent Back Tilt
Tilts the backrest independently from the seat.
![Independent Seat Tilt](/media/img/shop/pfi/023315.png?v5)
Independent Seat Tilt
Tilts the seat independently from the backrest.
![Posture Sprung Seat](/media/img/shop/pfi/023310.png?v5)
Posture Sprung Seat
Distributes weight evenly, reducing pressure on the back, pelvis and joints. Great for sitters with sciatica and bad back issues.
![Seat Slide](/media/img/shop/pfi/023311.png?v5)
Seat Slide
Seat slides in and out, adjusting the seat depth to fit to the body and legs.
![Weight Tension Control](/media/img/shop/pfi/023300.png?v10)
Weight Tension Control
Torsion is adjustable to your bodyweight to control the rate of the backrest recline.
Optional Features
![Headrest - Height & Tilt Adjustable](/media/img/shop/pfi/023360.png?v4)
Headrest - Height & Tilt Adjustable
Height and tilt adjustable headrest to support your head and neck.
Dimensions | mm |
Recommended Usage | 24 hours per day |
Recommended Weight Capacity | 1135g (21 stone) |
Seat Width | 450 |
Seat Depth | 470 to 540 |
Seat Height | 490 to 590 |
Backrest Width | 430 |
Backrest Height | 670 to 850 |
Overall Width | 610 |
Overall Height | 1210 |
Overall Depth | 670 |
Armrest Height (from the floor) | 660 to 760 |
Product Weight | 28kg |