Classic black polypropylene school chair with a durable grey steel frame, featuring an ergonomic seat shell for improved student posture in classrooms.
Black anti-tilt classroom chair showing angled rear legs for stability; BS EN1729 compliant and made from 100% recycled polypropylene for eco-friendly school furniture.
Size chart showing school chair dimensions by age group, including height, seat depth, and weight for children aged 3 to 14+ years. Ideal for selecting age-appropriate classroom seating.

Overview

Features

Safety & Warranty

Specifications & Dimensions

Delivery & Returns

Product FAQs

Product Overview: Size 4 Black Anti-Tilt Senior Primary Seating

The Cobolt Black Size 4 Chair provides a high-performance seating solution for students aged 8 to 11 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and heavy daily use required in busy Year 5 and Year 6 classrooms.

The Cobolt Advantage

  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your furniture remains a one-time capital investment for over a decade.
  • Mechanical Preventative Geometry: The specialized anti-tilt legs act as a proactive safeguard, shifting the balance point to discourage "chair swinging" habits among older students.
  • Low-Maintenance Aesthetic: The non-porous onyx shell resists staining and allows staff to maintain clinical standards with a simple wipe-down procedure.

Posture & Responsibility

  • KS2 Developmental Ergonomics: Adhering to Size 4 EN1729 standards, the 380mm seat height ensures students maintain a healthy lumbar position while keeping feet firmly planted.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.
  • Enhanced Circulation: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during tabletop learning sessions.

The Cobolt Standard

  • 50 Years of Expertise: As a trusted public sector partner for half a century, we deliver furniture that meets and exceeds the most rigorous UK educational benchmarks.
  • Free UK Mainland Delivery: We provide transparent, all-inclusive pricing by absorbing all shipping costs for your primary school refit project.
  • Domestic Quality Control: UK manufacturing guarantees high-grade finishes, shortened lead times, and a significantly lower carbon footprint than imported alternatives.

Where is this Size 4 Black Anti-Tilt Chair used?

The Black Size 4 School Chair is the primary specification for Year 5 and Year 6 Classrooms, Primary IT Suites, Junior Libraries, and After-School Study Hubs. Its adult-strength frame combined with senior-primary dimensions makes it an incredibly versatile asset for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear frame inhibits students from rocking back, reducing classroom accidents.
  • Size 4 (8-11 Years) – Precision-engineered 380mm seat height for the upper primary age group.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both frame welds and plastic shell integrity.
  • 3.5kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Grey Powder-Coated Steel – Slate-tone metallic finish that resists scratches and heavy daily wear.
  • Stackable Design – Efficient vertical stacking allows for easy classroom reconfiguration and cleaning.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and the high-traffic school environment.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Primary Estates

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of UK primary education.
  • Free UK Mainland Delivery: We manage the delivery of classroom refits free of charge to the UK mainland, keeping your project within budget.
  • Sustainability Goals: Our domestic manufacturing and 100% recyclable materials support your institution's carbon reduction targets.
  • Reliable Support: Our UK-based team is available to help bursars and estates managers select the correct sizing for their specific student demographics.

Primary Safety. Guaranteed Reliability.

  • The Anti-Tilt rear geometry is a crucial design feature for active senior-primary students, shifting the balance point to proactively prevent dangerous "chair swinging" habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (380mm) and depth (300mm) are perfectly scaled for the 8-11 year old stature.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or tabletop activities.
  • Industrial-grade Tamperproof fasteners provide a permanent, rattle-free connection between the polypropylene seat and the powder-coated grey legs.
  • Every unit is backed by a 15-year manufacturer's guarantee, covering structural frame integrity and shell defects for long-term reliability.

The Size 4 Black Anti-Tilt Chair combines certified upper-primary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Year 5 and Year 6 classrooms.

Target Ages
8-11 Years (Size 4)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
380mm
Standard Size 4 for upper primary students
Seat Dimensions
370mm (W) x 300mm (D)
Precision sized for Year 5 & 6
Total Dimensions
700mm(H) x 410mm(W) x 480mm(D)
Stable classroom footprint
Unit Weight
3.5kg
Robust yet easy to move for staff
Frame Finish
Slate Grey Powder Coated Steel
Vandal and scratch resistant finish
Compliance
BS EN1729 Compliant
Certified ergonomic and structural safety
Origin
Manufactured in UK
Quality assurance and low carbon footprint

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 5 Working Days service.

For all other locations, please email help@coboltfurniture.co.uk for a quote.


  • Made to Order: Many of our products are manufactured specifically for your order. Because of this, returns depend on the product specifics and require prior permission from Cobolt Furniture.
  • Cancellations: We always endeavour to reduce cancellation costs. However, please note a partial or entire charge may be levied to cover material costs and administrative fees if a made-to-order line is cancelled.

FAQs: Sourcing Seating for Upper Primary Schools

Q: Is "Size 4" correct for Year 5 and Year 6 classrooms?

A: Size 4 (380mm seat height) is the ergonomic standard for children aged 8 to 11 years. It ensures that senior primary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during the final stages of Key Stage 2.

Q: How does the "Anti-Tilt" mechanism actually work?

A: The rear legs are set at a specific outward angle. This shifts the leverage point, making it mechanically difficult for the chair to tip backwards even if a student leans back on two legs. This proactively prevents accidents and focus disruptions.

Q: Is Onyx Black a practical choice for a primary school?

A: Yes. Black provides a sophisticated aesthetic that reduces visual overstimulation. The polypropylene is completely non-porous and resistant to ink and common school chemicals, allowing for instant sanitisation with standard cleaners.

Q: What is the maximum weight capacity for these Size 4 chairs?

A: Despite being dimensioned for primary students, the high-strength slate-grey steel frame is rated for a massive 125kg. This ensures it is robust enough for occasional teacher use or evening community hires without structural risk.

Q: Are the seats tamper-proof to prevent vandalism?

A: Absolutely. We use industrial-grade tamperproof fasteners to secure the shell to the grey steel legs. This ensures students cannot loosen the fixings and that the chairs remain a permanent, safe asset in your school.

Q: Does this chair comply with fire and safety regulations?

A: Yes, it is fully compliant with BS EN1729 Parts 1 & 2, which are the specific standards for senior primary furniture regarding ergonomics, strength, and structural durability.

Q: How easy are these chairs to store during cleaning?

A: These chairs are designed for vertical stacking, allowing cleaning staff to clear floor space efficiently after the school day ends. Their lightweight 3.5kg build makes them easy to move.

Q: Why purchase from Cobolt Furniture?

A: With 50 years of expertise, we are a trusted partner to UK education. We provide Free UK Mainland Delivery, expert product knowledge, and furniture built specifically for the demands of the UK curriculum.

Overview

Product Overview: Size 4 Black Anti-Tilt Senior Primary Seating

The Cobolt Black Size 4 Chair provides a high-performance seating solution for students aged 8 to 11 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and heavy daily use required in busy Year 5 and Year 6 classrooms.

The Cobolt Advantage

  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your furniture remains a one-time capital investment for over a decade.
  • Mechanical Preventative Geometry: The specialized anti-tilt legs act as a proactive safeguard, shifting the balance point to discourage "chair swinging" habits among older students.
  • Low-Maintenance Aesthetic: The non-porous onyx shell resists staining and allows staff to maintain clinical standards with a simple wipe-down procedure.

Posture & Responsibility

  • KS2 Developmental Ergonomics: Adhering to Size 4 EN1729 standards, the 380mm seat height ensures students maintain a healthy lumbar position while keeping feet firmly planted.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.
  • Enhanced Circulation: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during tabletop learning sessions.

The Cobolt Standard

  • 50 Years of Expertise: As a trusted public sector partner for half a century, we deliver furniture that meets and exceeds the most rigorous UK educational benchmarks.
  • Free UK Mainland Delivery: We provide transparent, all-inclusive pricing by absorbing all shipping costs for your primary school refit project.
  • Domestic Quality Control: UK manufacturing guarantees high-grade finishes, shortened lead times, and a significantly lower carbon footprint than imported alternatives.

Features & Benefits

Where is this Size 4 Black Anti-Tilt Chair used?

The Black Size 4 School Chair is the primary specification for Year 5 and Year 6 Classrooms, Primary IT Suites, Junior Libraries, and After-School Study Hubs. Its adult-strength frame combined with senior-primary dimensions makes it an incredibly versatile asset for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear frame inhibits students from rocking back, reducing classroom accidents.
  • Size 4 (8-11 Years) – Precision-engineered 380mm seat height for the upper primary age group.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both frame welds and plastic shell integrity.
  • 3.5kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Grey Powder-Coated Steel – Slate-tone metallic finish that resists scratches and heavy daily wear.
  • Stackable Design – Efficient vertical stacking allows for easy classroom reconfiguration and cleaning.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and the high-traffic school environment.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Primary Estates

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of UK primary education.
  • Free UK Mainland Delivery: We manage the delivery of classroom refits free of charge to the UK mainland, keeping your project within budget.
  • Sustainability Goals: Our domestic manufacturing and 100% recyclable materials support your institution's carbon reduction targets.
  • Reliable Support: Our UK-based team is available to help bursars and estates managers select the correct sizing for their specific student demographics.

Safety & Warranty

Primary Safety. Guaranteed Reliability.

  • The Anti-Tilt rear geometry is a crucial design feature for active senior-primary students, shifting the balance point to proactively prevent dangerous "chair swinging" habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (380mm) and depth (300mm) are perfectly scaled for the 8-11 year old stature.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or tabletop activities.
  • Industrial-grade Tamperproof fasteners provide a permanent, rattle-free connection between the polypropylene seat and the powder-coated grey legs.
  • Every unit is backed by a 15-year manufacturer's guarantee, covering structural frame integrity and shell defects for long-term reliability.

Specification Dimensions

The Size 4 Black Anti-Tilt Chair combines certified upper-primary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Year 5 and Year 6 classrooms.

Target Ages
8-11 Years (Size 4)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
380mm
Standard Size 4 for upper primary students
Seat Dimensions
370mm (W) x 300mm (D)
Precision sized for Year 5 & 6
Total Dimensions
700mm(H) x 410mm(W) x 480mm(D)
Stable classroom footprint
Unit Weight
3.5kg
Robust yet easy to move for staff
Frame Finish
Slate Grey Powder Coated Steel
Vandal and scratch resistant finish
Compliance
BS EN1729 Compliant
Certified ergonomic and structural safety
Origin
Manufactured in UK
Quality assurance and low carbon footprint

Delivery & Returns

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 5 Working Days service.

For all other locations, please email help@coboltfurniture.co.uk for a quote.


  • Made to Order: Many of our products are manufactured specifically for your order. Because of this, returns depend on the product specifics and require prior permission from Cobolt Furniture.
  • Cancellations: We always endeavour to reduce cancellation costs. However, please note a partial or entire charge may be levied to cover material costs and administrative fees if a made-to-order line is cancelled.

Product FAQs

FAQs: Sourcing Seating for Upper Primary Schools

Q: Is "Size 4" correct for Year 5 and Year 6 classrooms?

A: Size 4 (380mm seat height) is the ergonomic standard for children aged 8 to 11 years. It ensures that senior primary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during the final stages of Key Stage 2.

Q: How does the "Anti-Tilt" mechanism actually work?

A: The rear legs are set at a specific outward angle. This shifts the leverage point, making it mechanically difficult for the chair to tip backwards even if a student leans back on two legs. This proactively prevents accidents and focus disruptions.

Q: Is Onyx Black a practical choice for a primary school?

A: Yes. Black provides a sophisticated aesthetic that reduces visual overstimulation. The polypropylene is completely non-porous and resistant to ink and common school chemicals, allowing for instant sanitisation with standard cleaners.

Q: What is the maximum weight capacity for these Size 4 chairs?

A: Despite being dimensioned for primary students, the high-strength slate-grey steel frame is rated for a massive 125kg. This ensures it is robust enough for occasional teacher use or evening community hires without structural risk.

Q: Are the seats tamper-proof to prevent vandalism?

A: Absolutely. We use industrial-grade tamperproof fasteners to secure the shell to the grey steel legs. This ensures students cannot loosen the fixings and that the chairs remain a permanent, safe asset in your school.

Q: Does this chair comply with fire and safety regulations?

A: Yes, it is fully compliant with BS EN1729 Parts 1 & 2, which are the specific standards for senior primary furniture regarding ergonomics, strength, and structural durability.

Q: How easy are these chairs to store during cleaning?

A: These chairs are designed for vertical stacking, allowing cleaning staff to clear floor space efficiently after the school day ends. Their lightweight 3.5kg build makes them easy to move.

Q: Why purchase from Cobolt Furniture?

A: With 50 years of expertise, we are a trusted partner to UK education. We provide Free UK Mainland Delivery, expert product knowledge, and furniture built specifically for the demands of the UK curriculum.

Black Classic Polypropylene Anti-Tilt School Chair - Size 4 - 8-11 Years

Product code: CH44BK
Equip your upper-primary learning zones with the Cobolt Onyx Polypropylene Anti-Tilt Chair (Size 4 / 8-11 Years). Specifically dimensioned for student...

Inc VAT

Exc VAT

£54.00

£45.00

Colours - Black
Age - 8-11 Years

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Overview

Features

Safety & Warranty

Specifications & Dimensions

Delivery & Returns

Product FAQs

Product Overview: Size 4 Black Anti-Tilt Senior Primary Seating

The Cobolt Black Size 4 Chair provides a high-performance seating solution for students aged 8 to 11 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and heavy daily use required in busy Year 5 and Year 6 classrooms.

The Cobolt Advantage

  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your furniture remains a one-time capital investment for over a decade.
  • Mechanical Preventative Geometry: The specialized anti-tilt legs act as a proactive safeguard, shifting the balance point to discourage "chair swinging" habits among older students.
  • Low-Maintenance Aesthetic: The non-porous onyx shell resists staining and allows staff to maintain clinical standards with a simple wipe-down procedure.

Posture & Responsibility

  • KS2 Developmental Ergonomics: Adhering to Size 4 EN1729 standards, the 380mm seat height ensures students maintain a healthy lumbar position while keeping feet firmly planted.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.
  • Enhanced Circulation: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during tabletop learning sessions.

The Cobolt Standard

  • 50 Years of Expertise: As a trusted public sector partner for half a century, we deliver furniture that meets and exceeds the most rigorous UK educational benchmarks.
  • Free UK Mainland Delivery: We provide transparent, all-inclusive pricing by absorbing all shipping costs for your primary school refit project.
  • Domestic Quality Control: UK manufacturing guarantees high-grade finishes, shortened lead times, and a significantly lower carbon footprint than imported alternatives.

Where is this Size 4 Black Anti-Tilt Chair used?

The Black Size 4 School Chair is the primary specification for Year 5 and Year 6 Classrooms, Primary IT Suites, Junior Libraries, and After-School Study Hubs. Its adult-strength frame combined with senior-primary dimensions makes it an incredibly versatile asset for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear frame inhibits students from rocking back, reducing classroom accidents.
  • Size 4 (8-11 Years) – Precision-engineered 380mm seat height for the upper primary age group.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both frame welds and plastic shell integrity.
  • 3.5kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Grey Powder-Coated Steel – Slate-tone metallic finish that resists scratches and heavy daily wear.
  • Stackable Design – Efficient vertical stacking allows for easy classroom reconfiguration and cleaning.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and the high-traffic school environment.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Primary Estates

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of UK primary education.
  • Free UK Mainland Delivery: We manage the delivery of classroom refits free of charge to the UK mainland, keeping your project within budget.
  • Sustainability Goals: Our domestic manufacturing and 100% recyclable materials support your institution's carbon reduction targets.
  • Reliable Support: Our UK-based team is available to help bursars and estates managers select the correct sizing for their specific student demographics.

Primary Safety. Guaranteed Reliability.

  • The Anti-Tilt rear geometry is a crucial design feature for active senior-primary students, shifting the balance point to proactively prevent dangerous "chair swinging" habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (380mm) and depth (300mm) are perfectly scaled for the 8-11 year old stature.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or tabletop activities.
  • Industrial-grade Tamperproof fasteners provide a permanent, rattle-free connection between the polypropylene seat and the powder-coated grey legs.
  • Every unit is backed by a 15-year manufacturer's guarantee, covering structural frame integrity and shell defects for long-term reliability.

The Size 4 Black Anti-Tilt Chair combines certified upper-primary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Year 5 and Year 6 classrooms.

Target Ages
8-11 Years (Size 4)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
380mm
Standard Size 4 for upper primary students
Seat Dimensions
370mm (W) x 300mm (D)
Precision sized for Year 5 & 6
Total Dimensions
700mm(H) x 410mm(W) x 480mm(D)
Stable classroom footprint
Unit Weight
3.5kg
Robust yet easy to move for staff
Frame Finish
Slate Grey Powder Coated Steel
Vandal and scratch resistant finish
Compliance
BS EN1729 Compliant
Certified ergonomic and structural safety
Origin
Manufactured in UK
Quality assurance and low carbon footprint

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 5 Working Days service.

For all other locations, please email help@coboltfurniture.co.uk for a quote.


  • Made to Order: Many of our products are manufactured specifically for your order. Because of this, returns depend on the product specifics and require prior permission from Cobolt Furniture.
  • Cancellations: We always endeavour to reduce cancellation costs. However, please note a partial or entire charge may be levied to cover material costs and administrative fees if a made-to-order line is cancelled.

FAQs: Sourcing Seating for Upper Primary Schools

Q: Is "Size 4" correct for Year 5 and Year 6 classrooms?

A: Size 4 (380mm seat height) is the ergonomic standard for children aged 8 to 11 years. It ensures that senior primary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during the final stages of Key Stage 2.

Q: How does the "Anti-Tilt" mechanism actually work?

A: The rear legs are set at a specific outward angle. This shifts the leverage point, making it mechanically difficult for the chair to tip backwards even if a student leans back on two legs. This proactively prevents accidents and focus disruptions.

Q: Is Onyx Black a practical choice for a primary school?

A: Yes. Black provides a sophisticated aesthetic that reduces visual overstimulation. The polypropylene is completely non-porous and resistant to ink and common school chemicals, allowing for instant sanitisation with standard cleaners.

Q: What is the maximum weight capacity for these Size 4 chairs?

A: Despite being dimensioned for primary students, the high-strength slate-grey steel frame is rated for a massive 125kg. This ensures it is robust enough for occasional teacher use or evening community hires without structural risk.

Q: Are the seats tamper-proof to prevent vandalism?

A: Absolutely. We use industrial-grade tamperproof fasteners to secure the shell to the grey steel legs. This ensures students cannot loosen the fixings and that the chairs remain a permanent, safe asset in your school.

Q: Does this chair comply with fire and safety regulations?

A: Yes, it is fully compliant with BS EN1729 Parts 1 & 2, which are the specific standards for senior primary furniture regarding ergonomics, strength, and structural durability.

Q: How easy are these chairs to store during cleaning?

A: These chairs are designed for vertical stacking, allowing cleaning staff to clear floor space efficiently after the school day ends. Their lightweight 3.5kg build makes them easy to move.

Q: Why purchase from Cobolt Furniture?

A: With 50 years of expertise, we are a trusted partner to UK education. We provide Free UK Mainland Delivery, expert product knowledge, and furniture built specifically for the demands of the UK curriculum.

Overview

Product Overview: Size 4 Black Anti-Tilt Senior Primary Seating

The Cobolt Black Size 4 Chair provides a high-performance seating solution for students aged 8 to 11 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and heavy daily use required in busy Year 5 and Year 6 classrooms.

The Cobolt Advantage

  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your furniture remains a one-time capital investment for over a decade.
  • Mechanical Preventative Geometry: The specialized anti-tilt legs act as a proactive safeguard, shifting the balance point to discourage "chair swinging" habits among older students.
  • Low-Maintenance Aesthetic: The non-porous onyx shell resists staining and allows staff to maintain clinical standards with a simple wipe-down procedure.

Posture & Responsibility

  • KS2 Developmental Ergonomics: Adhering to Size 4 EN1729 standards, the 380mm seat height ensures students maintain a healthy lumbar position while keeping feet firmly planted.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.
  • Enhanced Circulation: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during tabletop learning sessions.

The Cobolt Standard

  • 50 Years of Expertise: As a trusted public sector partner for half a century, we deliver furniture that meets and exceeds the most rigorous UK educational benchmarks.
  • Free UK Mainland Delivery: We provide transparent, all-inclusive pricing by absorbing all shipping costs for your primary school refit project.
  • Domestic Quality Control: UK manufacturing guarantees high-grade finishes, shortened lead times, and a significantly lower carbon footprint than imported alternatives.

Features & Benefits

Where is this Size 4 Black Anti-Tilt Chair used?

The Black Size 4 School Chair is the primary specification for Year 5 and Year 6 Classrooms, Primary IT Suites, Junior Libraries, and After-School Study Hubs. Its adult-strength frame combined with senior-primary dimensions makes it an incredibly versatile asset for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear frame inhibits students from rocking back, reducing classroom accidents.
  • Size 4 (8-11 Years) – Precision-engineered 380mm seat height for the upper primary age group.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both frame welds and plastic shell integrity.
  • 3.5kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Grey Powder-Coated Steel – Slate-tone metallic finish that resists scratches and heavy daily wear.
  • Stackable Design – Efficient vertical stacking allows for easy classroom reconfiguration and cleaning.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and the high-traffic school environment.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Primary Estates

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of UK primary education.
  • Free UK Mainland Delivery: We manage the delivery of classroom refits free of charge to the UK mainland, keeping your project within budget.
  • Sustainability Goals: Our domestic manufacturing and 100% recyclable materials support your institution's carbon reduction targets.
  • Reliable Support: Our UK-based team is available to help bursars and estates managers select the correct sizing for their specific student demographics.

Safety & Warranty

Primary Safety. Guaranteed Reliability.

  • The Anti-Tilt rear geometry is a crucial design feature for active senior-primary students, shifting the balance point to proactively prevent dangerous "chair swinging" habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (380mm) and depth (300mm) are perfectly scaled for the 8-11 year old stature.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or tabletop activities.
  • Industrial-grade Tamperproof fasteners provide a permanent, rattle-free connection between the polypropylene seat and the powder-coated grey legs.
  • Every unit is backed by a 15-year manufacturer's guarantee, covering structural frame integrity and shell defects for long-term reliability.

Specification Dimensions

The Size 4 Black Anti-Tilt Chair combines certified upper-primary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Year 5 and Year 6 classrooms.

Target Ages
8-11 Years (Size 4)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
380mm
Standard Size 4 for upper primary students
Seat Dimensions
370mm (W) x 300mm (D)
Precision sized for Year 5 & 6
Total Dimensions
700mm(H) x 410mm(W) x 480mm(D)
Stable classroom footprint
Unit Weight
3.5kg
Robust yet easy to move for staff
Frame Finish
Slate Grey Powder Coated Steel
Vandal and scratch resistant finish
Compliance
BS EN1729 Compliant
Certified ergonomic and structural safety
Origin
Manufactured in UK
Quality assurance and low carbon footprint

Delivery & Returns

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 5 Working Days service.

For all other locations, please email help@coboltfurniture.co.uk for a quote.


  • Made to Order: Many of our products are manufactured specifically for your order. Because of this, returns depend on the product specifics and require prior permission from Cobolt Furniture.
  • Cancellations: We always endeavour to reduce cancellation costs. However, please note a partial or entire charge may be levied to cover material costs and administrative fees if a made-to-order line is cancelled.

Product FAQs

FAQs: Sourcing Seating for Upper Primary Schools

Q: Is "Size 4" correct for Year 5 and Year 6 classrooms?

A: Size 4 (380mm seat height) is the ergonomic standard for children aged 8 to 11 years. It ensures that senior primary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during the final stages of Key Stage 2.

Q: How does the "Anti-Tilt" mechanism actually work?

A: The rear legs are set at a specific outward angle. This shifts the leverage point, making it mechanically difficult for the chair to tip backwards even if a student leans back on two legs. This proactively prevents accidents and focus disruptions.

Q: Is Onyx Black a practical choice for a primary school?

A: Yes. Black provides a sophisticated aesthetic that reduces visual overstimulation. The polypropylene is completely non-porous and resistant to ink and common school chemicals, allowing for instant sanitisation with standard cleaners.

Q: What is the maximum weight capacity for these Size 4 chairs?

A: Despite being dimensioned for primary students, the high-strength slate-grey steel frame is rated for a massive 125kg. This ensures it is robust enough for occasional teacher use or evening community hires without structural risk.

Q: Are the seats tamper-proof to prevent vandalism?

A: Absolutely. We use industrial-grade tamperproof fasteners to secure the shell to the grey steel legs. This ensures students cannot loosen the fixings and that the chairs remain a permanent, safe asset in your school.

Q: Does this chair comply with fire and safety regulations?

A: Yes, it is fully compliant with BS EN1729 Parts 1 & 2, which are the specific standards for senior primary furniture regarding ergonomics, strength, and structural durability.

Q: How easy are these chairs to store during cleaning?

A: These chairs are designed for vertical stacking, allowing cleaning staff to clear floor space efficiently after the school day ends. Their lightweight 3.5kg build makes them easy to move.

Q: Why purchase from Cobolt Furniture?

A: With 50 years of expertise, we are a trusted partner to UK education. We provide Free UK Mainland Delivery, expert product knowledge, and furniture built specifically for the demands of the UK curriculum.

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