Full ergonomic adjustment at a considered price
Most task chairs in this price range make you choose between a decent mechanism and decent armrests. The Coast gives you both. The Donati synchronised tilt mechanism coordinates seat and backrest movement so your spine stays supported as you shift position. The 4D armrests adjust in four directions so your forearms rest naturally whether you are typing, reading, or on a call.
Add a sliding seat for adjustable depth, a height-adjustable lumbar, and a 4-position tilt lock, and you have a chair that covers the full ergonomic brief without requiring a premium brand budget.
Two finishes, one specification
The Grey variant brings a white frame and base with grey upholstery, a combination that reads cleanly in contemporary and light-filled workspaces. The Black variant pairs black upholstery with a black frame throughout.
Both are identical in mechanism, adjustment range, and build quality. The choice is purely aesthetic. The Grey is the same chair sold in the commercial furniture trade as the Acama, a name you may recognise if you have specified task seating for fitouts before.
Features & Specifications
Key Features
- – Donati synchronised tilt mechanism with tension control
- – 4-position tilt lock
- – Sliding seat for adjustable seat depth
- – Adjustable lumbar support
- – 4D adjustable armrests (height, width, depth, pivot)
- – Upholstered seat and high-back panel
- – Optional adjustable headrest available
- – BIFMA tested, rated to 110kg
- – 3-year warranty
- – In stock, ships within 2 to 5 business days
Specifications
| SEAT WIDTH | 520mm |
| SEAT DEPTH | 500mm |
| SEAT HEIGHT | 440 to 540mm |
| BACK WIDTH | 480mm |
| BACK HEIGHT | 630mm |
| OVERALL HEIGHT | 1020 to 1120mm |
| OVERALL WIDTH | 670 to 710mm |
| ARM HEIGHT | 525 to 795mm |
| WEIGHT RATING | 110kg |
| CERTIFICATION | BIFMA |
| WARRANTY | 3 Years |
Black: black upholstery with black frame and base. Grey: grey upholstery with white frame and white base.
Just launched
Built for the Australian commercial market
The Coast is rated for multi-shift commercial use of more than 24 hours per day and is BIFMA tested to 110kg. It ships from stock and is supported by a 3-year warranty handled directly through Chair Dinkum. If you are fitting out multiple workstations, call us on 02 9640 0642 to discuss volume pricing.
Frequently asked questions
What is the difference between the Black and Grey variants? +
The Black variant pairs black upholstery with a black frame and base. The Grey variant uses grey upholstery with a white frame and white base, giving a lighter, more considered look that suits contemporary and Scandinavian-influenced workspaces. Both variants are identical in mechanism, adjustment range, and specification.
What is the Donati synchro mechanism and why does it matter? +
Donati is an Italian mechanism manufacturer whose components are used in premium task chairs across the industry. The synchronised tilt links the seat and backrest so they move together in a coordinated ratio as you recline, keeping your spine supported throughout the movement. This is a significant step up from a basic tilt mechanism, which simply pivots the seat and back as a single unit. The 4-position tilt lock lets you fix the chair in your preferred recline angle.
What does 4D armrests mean in practice? +
4D armrests adjust in four directions: height (up and down), width (in and out), depth (forward and back), and pivot angle (rotating the pad inward or outward). This lets you position your forearms to support natural shoulder and wrist alignment whether you are typing, reading, or on a call. Most chairs under $500 offer only height-adjustable armrests.
Is the Coast suitable for extended daily use? +
Yes. The Coast (also sold in the trade as the Acama chair) is rated for multi-shift commercial use of more than 24 hours per day and is BIFMA tested to 110kg. The Donati mechanism, reinforced base, and commercial-grade gas lift are all specified for daily 8-hour use in office environments.
Is an adjustable headrest available? +
Yes, an adjustable headrest is available as an optional addition. Contact us to discuss adding a headrest to your order.
What does the 3-year warranty cover? +
The 3-year warranty covers the frame, mechanism, gas lift, base, and armrests under normal commercial use. Upholstery is covered for manufacturing defects. Warranty claims are handled directly through Chair Dinkum.
Does assembly require tools? +
The chair arrives partially assembled and requires attaching the base, gas lift, and seat. No tools are required for standard assembly. Allow around 10 to 15 minutes.
Can I try the Coast in person before buying? +
Yes. Visit our Sydney showroom to try the Coast in person. We are open Monday to Friday, 9am to 5pm. Call us on 02 9640 0642 to confirm availability before visiting.
