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PRODUCT MODULE 01 / 06

Physical Dimensions

Automatic mm / inch conversion · Core engineering specifications

Data source: Structured from factory data; final measured values prevail.

Overall dimensions (W × D × H)	660 × 610 × 900 mm
Maximum adjustable seat height	530 mm
Minimum adjustable seat height	420 mm
Backrest height	410 mm
Seat surface dimensions	390 x 390 mm
Four-prong base span	610 mm
Caster diameter	50 mm
Backrest width	350 mm
Seat padding thickness	60 mm
Backrest padding thickness	50 mm
Lift column diameter	50 mm
Finished Seat Cushion Thickness	90 mm
Lumbar Support Zone Height	240 mm
Clear Width Between Armrests	540 mm

PRODUCT MODULE 02 / 06

Weight, Load & Performance

Net weight / load capacity / users / durability

Data source: Product performance data; verify exact test conditions before procurement.

Net weight	8 kg
Maximum static load capacity	113 kg
Single caster rated load	20 kg
Suitable child height range	170 cm
Upholstery abrasion resistance	30000 cycles
Seat foam density	35 kg/m³
Foam rebound rate	45%
Seam stitch pitch	8 mm
Seat Foam Density / Rebound Reference	45 kg/m³ / 65%
Back Foam Density Reference	38 kg/m³

PRODUCT MODULE 03 / 06

Materials & Structure

Core acceptance fields · Panels / hardware / frame / upholstery

Data source: Subject to the factory material list and inspection report.

Seat cushion core	High-resilience polyurethane foam
Backrest cushion core	High-resilience polyurethane foam
Upholstery fabric	Printed woven polyester with snowflake pattern
Lift adjustment columns	Powder-coated carbon steel tubing
Four-prong base	Injection-molded polypropylene with color-matched finish
Caster wheels	Nylon tire with carbon steel mounting bracket
Adjustment locking clips	Reinforced polypropylene
Base support crossbars	Powder-coated steel tube
Seat Internal Support Board Thickness	14 mm bent plywood or equivalent support board
Backrest Internal Frame Thickness	14 mm bent plywood/composite reinforced frame
Gas-lift Engineering Specification	Recommended Class 4; outer tube 50 mm; stroke 100 mm
Tilt Mechanism Plate Thickness	2.5 mm cold-rolled steel

PRODUCT MODULE 04 / 06

Functions & Adjustment

Adjustment / rotation / tilt / mobility / storage features

Data source: Functional configuration; the supplier specification prevails.

Mechanical seat height adjustment	Segmented lockable adjustment with 110mm total travel
Gravity-activated caster braking	Automatic wheel lock under seated load to prevent unwanted movement
360-degree caster swivel	Smooth omnidirectional rolling when unloaded for easy repositioning
Ergonomic posture support	Contoured separate backrest to encourage upright seated study posture
Screwless quick assembly	Tool-included snap-together assembly for home installation
Anti-tip base design	Four-point wide base footprint to prevent tipping during normal use
Recline Angle / Lock Reference	125° with 3suggested lock positions
Tilt Tension User-weight Range	Reference adjustment coverage 120 kg
Rotation / Mobility Configuration	360° swivel with 5-caster multidirectional movement

PRODUCT MODULE 05 / 06

Packaging & Logistics

Verified carton / gross weight / assembly / loading data

Data source: Reference for export quotations and container planning.

Reference Package Count	1 set / 2 cartons
Reference Assembly Time	40 minutes per set
Reference Carton Dimensions	850× 420× 720 mm
Reference Packaged Gross Weight	23 kg/set
Reference Carton Volume	0.26 m³/set
Indicative 20GP Loading	135 sets at 85% space utilization
Indicative 40HQ Loading	320 sets at 85% space utilization

PRODUCT MODULE 06 / 06

Applications & Usage

Recommended spaces / users / usage modes

Data source: Recommended applications based on product form and category.

Home children's study area	Pair with height-adjustable study desk for K-12 student homework use
Dedicated home classroom	Provide upright posture support for extended remote learning sessions
Children's bedroom	Compact footprint fits small rooms without occupying excessive floor space
Tutoring center training rooms	Adjustable height fits a wide range of student ages for shared use
Preschool and early elementary spaces	Gravity brake casters prevent rolling while children are seated
Multi-child household use	Multiple color options let parents assign chairs to individual children
Recommended Matching Desk Size	2.4 m executive desk
Reference Daily Use Duration	8 hours/day; confirm by ergonomic testing

STANDARD S1

EU Market Entry Requirements * EN Standards

EU Market Access Requirements* EN Standards

EN 1729-1:2015	Furniture for educational institutions Part 1: Functional dimensions for chairs
EN 1022:2018	Domestic furniture seating, test method for stability
EN 12520:2015	Domestic furniture seating, strength, durability and safety requirements

STANDARD S3

Standards Applicable to China-Market Projects * GB Standards

Standards applicable to China-market projects

GB 28007-2011	General technical requirements for children's furniture, applicable for structural safety
GB/T 3324-2017	General technical requirements for wooden furniture, applicable for plastic/metal furniture safety
GB 6675.1-2014	Toy safety Part 1: Basic specification, applicable for child product small parts safety

Standardized tender description text

This product must meet the following technical requirements:
1. GB 28007-2011: General technical requirements for children's furniture, applicable for structural safety;
2. GB/T 3324-2017: General technical requirements for wooden furniture, applicable for plastic/metal furniture safety;
3. GB 6675.1-2014: Toy safety Part 1: Basic specification, applicable for child product small parts safety;
Final delivery parameters, test reports, and acceptance criteria are subject to the purchase contract.

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Product Description

This unbranded mechanical height-adjustable ergonomic children’s study chair, model KSC-MECH-GRAV-4PR, is built to support consistent, comfortable seated positioning for growing learners across daily study activities. Visually, it features a soft padded seat and separate contoured backrest upholstered in printed woven polyester with a delicate snowflake pattern, paired with a smooth, color-matched four-prong rolling base for a streamlined, child-friendly aesthetic that integrates seamlessly with both casual and dedicated learning spaces. Its compact overall footprint of 660 x 610 x 900 mm avoids visual clutter, while the wide four-prong base creates a stable, anti-tip foundation for regular use. The chair is constructed with durable, child-appropriate materials: the seat and backrest cushions use high-resilience polyurethane foam with a 35 kg/m³ density and 45% rebound rate, upholstered in abrasion-resistant fabric rated to withstand 30,000 cycles of use. The height adjustment mechanism relies on powder-coated carbon steel lift columns, supported by powder-coated steel crossbars and a 14 mm thick bent plywood internal seat support board. The injection-molded polypropylene base holds 50 mm diameter nylon casters with carbon steel mounting brackets, secured with reinforced polypropylene locking clips for long-term structural reliability, delivering a maximum static load capacity of 113 kg. Core practical functions are tailored to children’s daily use: mechanical segmented seat height adjustment offers 110 mm of total lockable travel, accommodating users up to 170 cm tall, while the backrest reclines to 125 degrees with three suggested lock positions to support upright study posture. Gravity-activated casters automatically lock when a child is seated to prevent unwanted movement, and unlock to enable 360-degree swivel and smooth rolling for easy repositioning when unoccupied. The chair uses a screwless snap-together assembly design with included tools, requiring 40 minutes of setup time per unit. It is well suited for a wide range of spaces: home children’s study areas paired with height-adjustable desks for K-12 homework, dedicated home classrooms for extended remote learning, compact children’s bedrooms, shared tutoring center training rooms, and preschool or early elementary learning spaces. For multi-child households, multiple color options are available to assign individual chairs to each child. Procurement teams should note each unit ships across two cartons, with a total packaged gross weight of 23 kg and 0.26 m³ total carton volume, allowing 135 sets to fit in a 20GP container at 85% space utilization. The child-sized, unbranded design offers flexible deployment for both residential and small-scale institutional learning settings.

Mechanical Height-Adjustable Ergonomic Children's Study Chair with Gravity Brake Casters Specifications

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