Ergonomic Gaming Office Chair
HKM-776275
Engineered for extended comfort, built for performance. A seamless fusion of ergonomic precision and modern design, crafted to support your every move through the longest workdays and most intense gaming sessions.
Ergonomic ExcellenceDesigned Around You
Every contour, adjustment point, and material choice has been thoughtfully engineered to deliver a seating experience that adapts to your body—not the other way around.
Adaptive Lumbar Support
A precision-contoured backrest follows the natural S-curve of your spine, cradling your lower back to reduce pressure on vertebral discs. The integrated lumbar zone maintains proper pelvic alignment, helping prevent the slouching that leads to chronic lower back fatigue during extended sitting periods.
Precision Height Adjustment
A Class-3 gas lift mechanism offers seamless vertical travel across a range of approximately 4 inches (10 cm), allowing you to fine-tune seat height from roughly 17.7 inches to 21.7 inches (45–55 cm). This ensures your feet rest flat on the floor and your knees form a healthy 90° angle, promoting optimal circulation.
360° Swivel Mobility
The chair rotates smoothly through a full 360-degree range on a reinforced nylon-composite swivel base. This unrestricted rotation allows you to reach across your workspace without twisting your torso, reducing strain on your shoulders and neck—particularly valuable in multi-monitor setups or collaborative environments.
High-Density Foam Cushioning
The seat pan is layered with cold-cure molded foam rated at a density of approximately 3.1 lbs/ft³ (50 kg/m³), a formulation commonly found in premium automotive seating. This high-resilience foam distributes body weight evenly across the sitting surface, resisting flattening and sagging even after thousands of hours of use.
Fine-Tuned Adjustability
A chair that adapts to you is the foundation of sustained comfort. The HKM-776275 offers multiple independent adjustment points to create a truly personalized fit.
Multi-Angle Backrest Recline
The backrest tilts through a range of 90° to approximately 135°, enabling everything from upright task-focused posture to a relaxed recline for reading or brief rest. A tension-adjustable mechanism lets you set the resistance required to lean back, so lighter users aren't fighting the chair and heavier users feel securely supported throughout the tilt arc.
3D Articulating Armrests
Each armrest adjusts independently along three axes: height, forward/backward position, and inward/outward rotation. This 3D articulation lets you position the arm pads precisely where your forearms naturally rest while typing or gaming, reducing shoulder elevation and wrist extension that can lead to repetitive strain discomfort over time.
Technical Specifications
Detailed measurements and material data for informed decision-making.
Seat Height Range
17.7" – 21.7" (45 – 55 cm)
Backrest Tilt Range
90° – 135°
Weight Capacity
330 lbs (150 kg)
Net Weight
48.5 lbs (22 kg)
Caster Size
2.4" (60 mm) PU Silent
Seat Width
20.5" (52 cm)
Overall Height
47.2" – 51.2" (120 – 130 cm)
Seat Depth
18.9" (48 cm)
The Science of Sitting Well
Understanding the engineering and materials behind the HKM-776275 helps explain why this chair delivers comfort that endures hour after hour.
Cold-Cure Molded Foam Technology
Unlike conventional slab-cut foams that rely on adhesives and layered construction, cold-cure molding creates the seat cushion in a single, seamless piece. The polyurethane is poured into a precision mold and cured at ambient temperatures, resulting in a foam with a more uniform cell structure. This translates to consistent firmness across the entire sitting surface and dramatically improved resistance to compression set—the permanent deformation that causes cheaper foams to develop flat spots after months of use. Independent lab testing shows that high-density cold-cure foam retains over 94% of its original thickness after 80,000 compression cycles, equivalent to roughly 8–10 years of typical daily use.
Class-3 Gas Lift Cylinder
The gas lift is the heart of any adjustable chair, and the HKM-776275 employs a Class-3 cylinder certified to ANSI/BIFMA X5.1 standards. Inside the sealed steel cylinder, pressurized nitrogen gas provides smooth, controlled vertical motion without the jerkiness associated with lower-grade pneumatic systems. The Class-3 designation indicates a thicker cylinder wall and enhanced seal integrity, rated for a minimum of 100,000 actuation cycles. This means you can adjust your seat height multiple times a day, every day, for well over a decade without degradation in performance.
Passive Postural Alignment
While many chairs claim to "correct" posture, the HKM-776275 takes a more nuanced approach grounded in biomechanics research. The backrest curvature is designed not to force your spine into an idealized position, but rather to remove the muscular effort required to maintain neutral alignment. By supporting the sacral shelf and the thoracolumbar junction simultaneously, the chair allows your paraspinal muscles to relax without letting your pelvis tilt posteriorly—the common "slump" that increases intradiscal pressure by up to 40% compared to upright sitting. This passive support strategy means you finish your day with less fatigue, not because the chair did the work for you, but because it removed unnecessary work from your body.
Silent-Roll PU Casters
The five dual-wheel casters feature a polyurethane tread bonded to a precision-bearing nylon hub. PU was selected over standard nylon or rubber for its unique combination of properties: it rolls quietly across hard surfaces, grips adequately on low-pile carpet, and—critically—does not mar or scratch hardwood, laminate, or tile flooring. The 2.4-inch (60 mm) diameter provides sufficient ground clearance to navigate over threshold strips and cable management channels commonly found under desks. Each caster is independently rated for 66 lbs (30 kg) of dynamic load, meaning the five-caster array comfortably supports the chair's full weight capacity with a substantial safety margin.
Built for Every Kind of User
Whether you're climbing ranked ladders or closing quarterly reports, the HKM-776275 adapts to your workflow and playstyle.
For Gamers
When reaction times are measured in milliseconds, discomfort is a distraction you cannot afford. The HKM-776275 keeps you locked in with a stable platform that eliminates fidgeting, while the reclining backrest lets you find the perfect angle for controller or keyboard-and-mouse play. The 360° swivel means you never need to twist awkwardly to grab a drink or acknowledge a teammate.
For Professionals
In a hybrid or fully remote work environment, your home office chair is now your primary workstation. The HKM-776275 delivers the adjustability and support expected from premium office furniture, with a design aesthetic that looks professional on video calls. The durable upholstery withstands 8–10 hour daily use without showing wear, and the silent casters won't interrupt meetings when you reposition.
Frequently Asked Questions
Answers to the most common questions about the HKM-776275.
What is the maximum weight capacity of the HKM-776275?
The HKM-776275 is engineered to support users weighing up to 330 lbs (150 kg). This rating accounts for dynamic loading during reclining and swiveling motions, not just static seated weight. The aluminum-alloy base, Class-3 gas lift, and reinforced seat plate all contribute to this robust capacity, which has been verified through BIFMA-standard cyclical load testing.
How does the lumbar support system work?
The backrest incorporates an integrated lumbar contour that follows the natural lordotic curve of the lower spine. Rather than using a separate, protruding lumbar pillow that can feel intrusive, the HKM-776275 builds the support into the backrest shell itself. The curvature is subtle enough to accommodate a range of body types while still providing the anterior pelvic support that helps maintain neutral spinal alignment during prolonged sitting.
Is the chair suitable for users of different heights?
Yes. The seat height adjusts from approximately 17.7 inches to 21.7 inches (45–55 cm), which accommodates users roughly between 5'2" and 6'4" (157–193 cm) when paired with an appropriate desk height. The backrest is tall enough at 31.5 inches (80 cm) to provide full shoulder support for most users within this range. For individuals outside this height range, we recommend checking your specific ergonomic requirements against the detailed specifications listed above.
What type of flooring are the casters suitable for?
The HKM-776275 comes equipped with 2.4-inch (60 mm) polyurethane dual-wheel casters that perform excellently on hardwood, laminate, tile, vinyl, and low-to-medium pile carpet. PU casters are specifically chosen because they combine quiet rolling with floor protection—unlike hard nylon casters that can scratch delicate surfaces or soft rubber casters that wear down quickly. For deep-pile carpet or uneven stone flooring, aftermarket rollerblade-style casters can be installed as the stem fitting uses the industry-standard 11 mm x 22 mm size.
Can the armrests be adjusted or removed?
The armrests are fully adjustable along three axes: vertical height, horizontal forward/backward position, and angular rotation inward or outward. They can also be completely removed if you prefer an armrest-free setup—simply unscrew the mounting bolts beneath the seat plate. The arm pads are topped with a medium-density polyurethane foam wrapped in the same durable upholstery as the seat, providing comfortable forearm support without excessive softness that might compromise stability during precise mouse movements.
What is the assembly process like?
The HKM-776275 ships in a single carton with all components, hardware, and tools included. Assembly typically takes one person approximately 20–30 minutes. The main steps involve attaching the casters to the base, inserting the gas lift, mounting the seat mechanism to the seat pan, attaching the backrest to the seat, and placing the assembled upper section onto the base. Detailed illustrated instructions are provided, and all bolts use the included hex key—no additional tools are required.
Purchase with Confidence
Every HKM-776275 order is backed by comprehensive coverage.
Free Shipping on All Orders
Complimentary standard delivery to your doorstep. No minimum purchase required.
180-Day Purchase Protection
Extended coverage against manufacturing defects for a full six months from delivery.
30-Day Money-Back Guarantee
Not satisfied? Return the chair within 30 days for a full refund—no questions asked.
24-Month Warranty Service
Full manufacturer's warranty covering parts and workmanship for two full years.
Nationwide Service Network & Support
With over 3,600+ authorized service centers across the United States, we ensure comprehensive after-sales support for your product, giving you complete peace of mind.
We understand that maintenance needs may arise. When you purchase from us, you gain access to our unparalleled service ecosystem designed for maximum convenience and reliability.
1. DIY Repair & Parts Replacement:
For minor repairs or part replacements that can be handled personally, we provide cost-price genuine parts during the warranty period. Each order is accompanied by clear, step-by-step video tutorials to guide you through the self-repair process seamlessly.
2. Professional Servicing:
For issues requiring expert attention, simply contact our support team. We will locate the nearest authorized service center based on your order and location details. You only need to bring your product to the designated center. Once servicing is complete, we will notify you for pickup. All repairs are free during the warranty period; afterward, only cost-based fees apply.
Every product on Hekomart.com is expertly curated from thousands, quality tested, and lifestyle approved. Elevate your everyday.
Express Delivery Priority - Where Speed Meets Satisfaction
At Hekomart.com, we understand the anticipation that comes with every online order. While most platforms rely on standard economy shipping, we prioritize your excitement by strategically selecting premium express carriers to accelerate deliveries. Our intelligent logistics system analyzes real-time data to optimize routes, partnering with globally-recognized couriers like DHL, FedEx, and UPS to ensure 30% faster doorstep arrivals* than industry averages.
Every package receives 24/7 tracking visibility and proactive delivery updates, transforming waiting time into confidence. For time-sensitive purchases, our "Expedited Service Guarantee" offers optional priority handling at no extra cost, because your satisfaction isn't just a goal – it's the core of our delivery DNA.
*Based on internal 2025 data comparing standard shipping durations across major platforms. Delivery times vary by destination and customs procedures.
Credit Card 180 Days Purchase Protection
The 180 Days Purchase Protection protects the buyer if an item purchased has not been shipped or if a shipped item is significantly not as described by the seller. The 180 Days Purchase Protection covers all purchases and payments made through our website. We accept Visa, Master Card, American Express, and Discover Card. If you don't receive the item that you ordered, or it shows up significantly different from its description, you may qualify for Purchase Protection, and we'll reimburse you for the full purchase price plus any original shipping costs, subject to terms and limitations. If you are charged for a transaction that you didn't make, let us know within 60 days, and we've got you covered.
30 Days Money-Back Guarantee
We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost. No restocking charges. Any additional fees associated with a purchase transaction will be deducted from the amount of the refund.
24-Month Extended Warranty Service
If you purchase products from our website, you have 24 months to request repairs or replacement if any products turns out to be faulty or are not as advertised. During the warranty period if any product is found to have a manufacturer defect, we will repair or replace the defective part(s). If a product cannot be repaired or replaced within a reasonable time, you can request a refund or price reduction. We are confident that our products are of great quality and even better value. However, if upon receiving and inspecting your item you decide that you want to return it, you will have 30 days as of the date of shipment arrival to return it for a refund minus the shipping cost.
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