Exploring the Office Master YS78 Chair: A Detailed Review

Office Master Chairs YS78


In the quest for the perfect office chair, one name consistently stands out: the Office Master YS78. This chair is not just a piece of furniture; it's a cornerstone of ergonomic design, blending style, functionality, and comfort into an attractive package.

Designed to meet the demands of modern workspaces, the YS78 chair from OM Seating offers a range of adjustable features tailored to support your body throughout the workday.

Whether you're drafting a report, brainstorming with colleagues, or navigating through daily tasks, the YS78 is engineered to enhance your productivity and well-being.

Join us as we delve into the world of Office Master chairs, exploring the myriad of features that make the YS78 a standout choice for professionals everywhere.

We'll start off by going over some of the main ergonomic features of the chair.

Office Master YS78 Features:

Synchronous Seat/Back Tilt:

The synchronous seat/back tilt is a pivotal feature of the Office Master YS78 chair, designed to enhance the user's comfort and maintain proper posture throughout the workday.

This sophisticated mechanism allows the chair's seat and backrest to move in a coordinated fashion, ensuring that the user enjoys a balanced and supportive seating experience.

When you recline in the YS78, the backrest tilts back while the seat slightly tilts as well, but at a lesser angle. This ratio is carefully calibrated to maintain a natural body posture, reducing the strain on your spine and pelvis.

The synchronous tilt ensures that your feet remain flat on the floor, your thighs stay parallel to the ground, and your body maintains an open hip angle. This dynamic movement supports various postures and activities, from focused task work to relaxed contemplation.

This feature is particularly beneficial for users who spend extended periods seated, as it encourages subtle movements and adjustments. By promoting dynamic sitting, the synchronous tilt mechanism helps stimulate circulation, reduces muscle fatigue, and minimizes the risk of discomfort or long-term strain.

Additionally, the ability to lock the tilt in multiple positions allows users to find and maintain their ideal balance between movement and support, catering to personal preferences and varying tasks throughout the day.

Office Master Chairs Synchronous back/seat tilt

Seat Depth Adjustment:

The seat depth adjustment on the Office Master YS78 is pivotal in providing a tailored seating experience, ensuring that users can find their ideal support and comfort level.

This feature allows for precise customization of the seat's length, accommodating a range of body sizes, which is essential for maintaining good posture and circulation throughout the workday.

Easily adjustable to individual preferences, this feature ensures that every user can achieve a perfect fit, reducing the risk of discomfort and enhancing ergonomic benefits.

By enabling proper leg positioning and back support, the seat depth adjustment contributes to a healthier sitting posture, crucial for those spending extended periods at their desks.

The adaptability of this function makes the Office Master YS78 a versatile choice for various office environments or home setups

Office Master Chairs Seat Depth Adjustment

3-Stage Locking Mechanism:

The Office Master YS78 includes a 3-stage locking mechanism, a functional feature that allows users to fix the chair's tilt at three distinct angles. This straightforward mechanism enhances the chair's versatility, accommodating different work styles and preferences with ease.

Whether sitting upright for task-focused activities or reclining slightly for a moment of relaxation, this feature supports the user's desire for personalized comfort. It's a practical addition that enhances the user experience by providing options to suit various sitting positions throughout the workday.

Mesh Back (High):

At the core of the Office Master YS78's design is its high-quality mesh back, a feature engineered for both comfort and style. The chair comes standard with a durable black mesh that not only complements its modern aesthetic but also offers practical benefits for daily use.

The breathable nature of the mesh material ensures continuous airflow, keeping users cool and comfortable even during extended periods of sitting. This is especially beneficial in warmer environments or for individuals who prefer a chair that facilitates better ventilation.

The YS78's mesh back is not just about maintaining a comfortable temperature; it also provides essential support. The ergonomic design contours to the user's back, offering targeted support that encourages a healthy posture. This reduces the likelihood of discomfort or strain, making the YS78 an ideal choice for anyone seeking a chair that combines ergonomic features with a sleek, contemporary design.

In addition to the standard black mesh, the Office Master YS78 offers customization options to suit various tastes and office decors. Users can choose from the Neighborhood Mesh fabric series, a selection of high-quality mesh fabrics available in a range of colors. This option allows individuals or companies to personalize their chairs to match their workspace aesthetic, adding a touch of individuality while maintaining the chair's ergonomic benefits.

Whether opting for the classic black mesh or customizing with a choice from the Neighborhood Mesh series, the YS78 chair adapts to user preferences, proving that functionality and style can coexist harmoniously in office furniture design. This mesh back feature underscores the Office Master YS78's commitment to providing a seating solution that meets diverse needs, blending ergonomic support with the flexibility to personalize your workspace.

Mesh Back Office Master Chairs


For more information on the features and adjustability functions of this chair and others, check out our blog on the ultimate chair adjustment guide. We breakdown all of the ergonomic jargon so you can have a better understanding for how your chair functions. 

Office Master YS78 Product Specifications:

Product Size Chart:

  • Overall Width: 27"
  • Overall Height: Adjustable from 41.5" to 49.5"
  • Back Dimensions: 20" W x 24" H
  • Seat Dimensions: 20.5" W x 18" - 20" D (adjustable depth)
  • Seat Height: Adjustable from 16" to 20", with additional options to adjust from 17.5" to 22.5" and 19.5" to 25.5" depending on the cylinder choice.
  • Weight Capacity: Supports up to 300 lbs, accommodating a broad range of users.
  • Carton Weight: 53 pounds, indicating the package weight when shipped.
  • UPS Weight: 101 pounds, reflecting the dimensional weight used for shipping calculations


  • Warranty: A 12-year limited warranty, underscoring the manufacturer's confidence in the chair's durability and quality.

Additional Notes:

  • Arms are sold separately, allowing for further customization, with options available in Groups 1 and 4 to suit various user preferences and ergonomic requirements.

Office Master YS78 Assembly

Assembling your Office Master YS78 chair is designed to be straightforward, ensuring you can quickly enjoy the comfort and support it offers. Here's a step-by-step guide to assembling your new chair:

  1. Base Preparation: Begin by placing the base on a level surface. Ensure it's positioned correctly to support the rest of the assembly steps.

  2. Cylinder Installation: Insert the wider end of the cylinder into the center hole of the base. Make sure it's firmly seated to provide stable support for the chair.

  3. Chair Top Attachment: Lower the chair top onto the cylinder. It should fit snugly, ensuring a secure connection between the chair top and the base.

  4. Cylinder Activation: Press down on the chair to activate the cylinder, adjusting it to its lowest point. This step is crucial for the correct alignment and functionality of the height adjustment feature.

  5. Securing the Connection: Sit on the chair to engage the top and mechanism connection fully. This step helps ensure that the chair's components are properly aligned and secure.

  6. Final Adjustments: Carefully distribute your body weight evenly while seated to ensure the chair top is fully secured onto the cylinder and base, providing a stable and secure seating structure.

  7. Optional Arm Assembly: If your YS78 chair model includes arms, attach them at this point by aligning them with the designated areas on the chair and securing them with the provided screws.

Office Master Yes Series Assembly Instructions

Tips for a Successful Assembly:

  • Verify all components are present before beginning assembly.
  • Follow each step in order to prevent any missteps or the need to backtrack.
  • Do not fully tighten screws until all components are loosely assembled to ensure easy alignment and adjustment.

By following these instructions, you'll have your Office Master YS78 chair assembled and ready for use, providing you with ergonomic support and comfort tailored to your workspace needs.


The Office Master YS78 stands as a testament to thoughtful design and ergonomic excellence, suited for the dynamic needs of today's professionals. With its comprehensive adjustability features, supportive mesh back, and robust build quality, it offers an unparalleled blend of comfort, style, and functionality.

Whether upgrading your home workspace or outfitting a new office, this chair provides the flexibility and support essential for enhancing productivity and well-being. By choosing the YS78, you're investing in a seating solution that prioritizes your comfort and health, ensuring sustained focus and effectiveness in any task.