Grey plastic chair with silver metal legs and cutout backrest, built for institutional durability and comfort.
Grey plastic chair with silver metal legs and rectangular backrest cutout, designed for stacking and institutional use.
Specification chart showing chair sizes for different age groups with seat dimensions, popliteal height, and BS EN1729 compliance, plus colour-coded foot illustrations for each size mark.

Overview

Features

Safety & Warranty

Specifications & Dimensions

Delivery & Returns

Product FAQs

Product Overview: Size 5 Dark Grey Reinforced Secondary Chair

The Cobolt Dark Grey Reinforced Chair is the professional choice for high-traffic secondary school interiors. Delivered with Free UK Mainland Delivery, it is built to survive the "KS3 routine"—intensive daily usage, constant room transitions, and the specific ergonomic needs of growing teenagers.

The Cobolt Advantage

  • Budget Security: Our industry-leading 15-year guarantee ensures your investment is protected, serving multiple student cohorts throughout their secondary journey.
  • Venue Flexibility: Specifically designed for multi-use halls, these units stack securely up to 10 high, allowing for rapid floor clearance for exams or cleaning.
  • Smart Sorting: The non-slip feet are colour-coded to the Size 5 standard, allowing site managers to instantly identify and organise secondary-height furniture.

Ergonomics & Sustainability

  • BS EN1729 Compliance: Specifically dimensioned for the 11-14 demographic (Size 5), the shell encourages a healthy spine position to maintain concentration during long lessons.
  • Eco-Responsible: Engineered for a circular economy, the unit can be fully disassembled into metal and plastic parts for responsible local recycling.
  • Lumbar Support: The anatomically contoured backrest provides vital reinforcement, helping older students stay focused and comfortable during double periods.

Tamper-Proof Engineering

We understand that secondary school furniture must be resilient. By eliminating all external nuts and screws, we have created a seamless, anti-tamper profile that removes the risk of fixings being loosened or students damaging their uniforms on sharp edges.

The Cobolt Standard

  • 50 Years of Expertise: We have spent half a century supplying the UK public sector, ensuring every chair meets the highest benchmarks for durability and student safety.
  • Free UK Mainland Delivery: We manage all transport logistics at no extra cost, providing a transparent, budget-friendly procurement experience for your school.
  • Secondary Specialists: Our UK-based team offers dedicated support for academy refits and bulk secondary school tender requirements.

Where is this Size 5 Anti-Tilt Chair used?

The Dark Grey Reinforced Secondary Chair is a popular specification for Key Stage 3 Classrooms, Secondary ICT Suites, School Science Labs, and Academy Dining Halls. Its professional charcoal finish and specific dimensions (Size 5) make it a versatile asset for senior education providers.

Key Features

  • Anti-Tilt Geometry – Stable base design prevents dangerous backward tipping during classroom sessions.
  • Extra-Strong Undercarriage – Reinforced steel bracing ensures exceptional durability for growing students.
  • Size 5 (11-14 Years) – Correct ergonomic scaling for the early secondary school stage.
  • 15-Year Warranty – Extensive cover for the structural frame and the high-impact shell.
  • No Nuts or Screws – Anti-tamper construction ensures a smooth, blazer-safe finish.
  • Stackable 10-High – Maximises floor space efficiency in busy multi-purpose halls.
  • Colour-Coded Feet – Non-marking caps protect flooring and provide easy size identification.
  • UK Manufactured – Quality British production with a minimal environmental footprint.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service & Ethos: Supporting School Estates

  • 50 Years of Expertise: We understand the specific load-bearing and safety requirements of secondary school furniture.
  • Free Delivery (UK Mainland): We absorb shipping costs to ensure your academy budget goes further.
  • Sustainability Partners: Fully recyclable materials help your institution meet its environmental targets.
  • Reliable Support: Our experienced team provides expert guidance from product selection to final installation.

Built for Safety. Backed for Reliability.

  • The Anti-Tilt design provides a secure foundation, significantly reducing the risk of older students tipping backwards during classroom activities.
  • Compliance with BS EN1729 Part 1 ensures the 430mm seat height is ergonomically suitable for the 11-14 age group, preventing back strain.
  • The Smooth-Finish Construction eliminates the need for nuts and screws, ensuring no sharp points can catch on blazers or loose clothing.
  • A Reinforced Undercarriage adds substantial structural support, ensuring the chair can withstand the increased weight requirements of growing teenagers.
  • We offer a market-leading 15-year manufacturer's guarantee. This covers the reinforced frame and the high-impact shell, offering total peace of mind for business managers.

The Size 5 Dark Grey Reinforced Chair combines certified ergonomic support with secondary-level safety engineering. These specifications detail the heavy-duty materials and dimensions that make it the responsible choice for academies.

Age Group
11-14 Years (Size 5)
Material
Reinforced Plastic
Guarantee
15 Years
Specification
Details
Purpose / Benefit
Seat Height
430mm
Standard Size 5 for Key Stage 3
Total Dimensions
430mm(H) x 394mm(W) x 400mm(D)
Secondary-specific profile
Leg Finish
Grey Metal
Durable and professional
Construction
Reinforced Undercarriage
Enhanced structural lifespan
Safety Feature
No Nuts or Screws
Anti-tamper and blazer safe
Stacking Ability
Up to 10 High
Excellent venue management
Sustainability
Recyclable Components
Supports carbon reduction targets
Compliance
BS EN1729 Parts 1 & 2
Certified for education use
Origin
Manufactured in UK
Quality assurance

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 20 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: Size 5 Dark Grey Reinforced Secondary Seating

Q: Is "Size 5" the industry standard for Year 7, 8, and 9 students?

A: Yes. Size 5 is specifically dimensioned for the 11-to-14-year age group. With a 430mm seat height, it accommodates the average height of Key Stage 3 students, ensuring their feet are flat on the floor for optimal postural support.

Q: How does the 'Reinforced Undercarriage' differ from standard secondary chairs?

A: Secondary environments involve higher weight loads. Our reinforced model features additional steel strengthening under the seat shell, providing a more rigid frame that prevents the "splaying" often seen in cheaper non-reinforced chairs.

Q: Why is the "no nuts or screws" feature important for Year 7–9 environments?

A: At this age, students often tamper with classroom furniture. Our design removes all external fixings, making it impossible to loosen screws or remove the seat from the frame. It also prevents delicate blazers from snagging on sharp metal edges.

Q: Can these chairs be safely stacked in an exam hall?

A: Absolutely. These chairs are engineered for high-density storage. They stack stably up to **10 units high**, allowing site staff to clear large halls or multi-purpose rooms quickly and efficiently.

Q: Are the 'colour-coded feet' useful for academy campus management?

A: Yes. In a large secondary school with multiple chair sizes, the Size 5 colour-coded feet allow your facilities team to instantly identify if the correct furniture is in the correct department, saving time during room changeovers.

Q: How resistant is the Dark Grey shell to scratches and scuffs?

A: The high-grade polypropylene is colour-fast and extremely resilient. The Dark Grey charcoal tone is specifically chosen for secondary environments as it hides minor surface marks and maintains a professional look far better than lighter colours.

Q: Does this chair meet current UK educational safety standards?

A: Yes. It is fully compliant with **BS EN1729 Parts 1 & 2**. This guarantees the chair meets the specific ergonomic requirements for the 11-14 age range and has passed rigorous tests for structural strength and stability.

Q: Why should our school procurement team choose Cobolt?

A: With **50 years of expertise**, we provide school-tested solutions. We back our quality with a 15-year warranty and provide **Free UK Mainland Delivery** to ensure your project stays on budget and on schedule.

Overview

Product Overview: Size 5 Dark Grey Reinforced Secondary Chair

The Cobolt Dark Grey Reinforced Chair is the professional choice for high-traffic secondary school interiors. Delivered with Free UK Mainland Delivery, it is built to survive the "KS3 routine"—intensive daily usage, constant room transitions, and the specific ergonomic needs of growing teenagers.

The Cobolt Advantage

  • Budget Security: Our industry-leading 15-year guarantee ensures your investment is protected, serving multiple student cohorts throughout their secondary journey.
  • Venue Flexibility: Specifically designed for multi-use halls, these units stack securely up to 10 high, allowing for rapid floor clearance for exams or cleaning.
  • Smart Sorting: The non-slip feet are colour-coded to the Size 5 standard, allowing site managers to instantly identify and organise secondary-height furniture.

Ergonomics & Sustainability

  • BS EN1729 Compliance: Specifically dimensioned for the 11-14 demographic (Size 5), the shell encourages a healthy spine position to maintain concentration during long lessons.
  • Eco-Responsible: Engineered for a circular economy, the unit can be fully disassembled into metal and plastic parts for responsible local recycling.
  • Lumbar Support: The anatomically contoured backrest provides vital reinforcement, helping older students stay focused and comfortable during double periods.

Tamper-Proof Engineering

We understand that secondary school furniture must be resilient. By eliminating all external nuts and screws, we have created a seamless, anti-tamper profile that removes the risk of fixings being loosened or students damaging their uniforms on sharp edges.

The Cobolt Standard

  • 50 Years of Expertise: We have spent half a century supplying the UK public sector, ensuring every chair meets the highest benchmarks for durability and student safety.
  • Free UK Mainland Delivery: We manage all transport logistics at no extra cost, providing a transparent, budget-friendly procurement experience for your school.
  • Secondary Specialists: Our UK-based team offers dedicated support for academy refits and bulk secondary school tender requirements.

Features & Benefits

Where is this Size 5 Anti-Tilt Chair used?

The Dark Grey Reinforced Secondary Chair is a popular specification for Key Stage 3 Classrooms, Secondary ICT Suites, School Science Labs, and Academy Dining Halls. Its professional charcoal finish and specific dimensions (Size 5) make it a versatile asset for senior education providers.

Key Features

  • Anti-Tilt Geometry – Stable base design prevents dangerous backward tipping during classroom sessions.
  • Extra-Strong Undercarriage – Reinforced steel bracing ensures exceptional durability for growing students.
  • Size 5 (11-14 Years) – Correct ergonomic scaling for the early secondary school stage.
  • 15-Year Warranty – Extensive cover for the structural frame and the high-impact shell.
  • No Nuts or Screws – Anti-tamper construction ensures a smooth, blazer-safe finish.
  • Stackable 10-High – Maximises floor space efficiency in busy multi-purpose halls.
  • Colour-Coded Feet – Non-marking caps protect flooring and provide easy size identification.
  • UK Manufactured – Quality British production with a minimal environmental footprint.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service & Ethos: Supporting School Estates

  • 50 Years of Expertise: We understand the specific load-bearing and safety requirements of secondary school furniture.
  • Free Delivery (UK Mainland): We absorb shipping costs to ensure your academy budget goes further.
  • Sustainability Partners: Fully recyclable materials help your institution meet its environmental targets.
  • Reliable Support: Our experienced team provides expert guidance from product selection to final installation.

Safety & Warranty

Built for Safety. Backed for Reliability.

  • The Anti-Tilt design provides a secure foundation, significantly reducing the risk of older students tipping backwards during classroom activities.
  • Compliance with BS EN1729 Part 1 ensures the 430mm seat height is ergonomically suitable for the 11-14 age group, preventing back strain.
  • The Smooth-Finish Construction eliminates the need for nuts and screws, ensuring no sharp points can catch on blazers or loose clothing.
  • A Reinforced Undercarriage adds substantial structural support, ensuring the chair can withstand the increased weight requirements of growing teenagers.
  • We offer a market-leading 15-year manufacturer's guarantee. This covers the reinforced frame and the high-impact shell, offering total peace of mind for business managers.

Specification Dimensions

The Size 5 Dark Grey Reinforced Chair combines certified ergonomic support with secondary-level safety engineering. These specifications detail the heavy-duty materials and dimensions that make it the responsible choice for academies.

Age Group
11-14 Years (Size 5)
Material
Reinforced Plastic
Guarantee
15 Years
Specification
Details
Purpose / Benefit
Seat Height
430mm
Standard Size 5 for Key Stage 3
Total Dimensions
430mm(H) x 394mm(W) x 400mm(D)
Secondary-specific profile
Leg Finish
Grey Metal
Durable and professional
Construction
Reinforced Undercarriage
Enhanced structural lifespan
Safety Feature
No Nuts or Screws
Anti-tamper and blazer safe
Stacking Ability
Up to 10 High
Excellent venue management
Sustainability
Recyclable Components
Supports carbon reduction targets
Compliance
BS EN1729 Parts 1 & 2
Certified for education use
Origin
Manufactured in UK
Quality assurance

Delivery & Returns

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 20 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: Size 5 Dark Grey Reinforced Secondary Seating

Q: Is "Size 5" the industry standard for Year 7, 8, and 9 students?

A: Yes. Size 5 is specifically dimensioned for the 11-to-14-year age group. With a 430mm seat height, it accommodates the average height of Key Stage 3 students, ensuring their feet are flat on the floor for optimal postural support.

Q: How does the 'Reinforced Undercarriage' differ from standard secondary chairs?

A: Secondary environments involve higher weight loads. Our reinforced model features additional steel strengthening under the seat shell, providing a more rigid frame that prevents the "splaying" often seen in cheaper non-reinforced chairs.

Q: Why is the "no nuts or screws" feature important for Year 7–9 environments?

A: At this age, students often tamper with classroom furniture. Our design removes all external fixings, making it impossible to loosen screws or remove the seat from the frame. It also prevents delicate blazers from snagging on sharp metal edges.

Q: Can these chairs be safely stacked in an exam hall?

A: Absolutely. These chairs are engineered for high-density storage. They stack stably up to **10 units high**, allowing site staff to clear large halls or multi-purpose rooms quickly and efficiently.

Q: Are the 'colour-coded feet' useful for academy campus management?

A: Yes. In a large secondary school with multiple chair sizes, the Size 5 colour-coded feet allow your facilities team to instantly identify if the correct furniture is in the correct department, saving time during room changeovers.

Q: How resistant is the Dark Grey shell to scratches and scuffs?

A: The high-grade polypropylene is colour-fast and extremely resilient. The Dark Grey charcoal tone is specifically chosen for secondary environments as it hides minor surface marks and maintains a professional look far better than lighter colours.

Q: Does this chair meet current UK educational safety standards?

A: Yes. It is fully compliant with **BS EN1729 Parts 1 & 2**. This guarantees the chair meets the specific ergonomic requirements for the 11-14 age range and has passed rigorous tests for structural strength and stability.

Q: Why should our school procurement team choose Cobolt?

A: With **50 years of expertise**, we provide school-tested solutions. We back our quality with a 15-year warranty and provide **Free UK Mainland Delivery** to ensure your project stays on budget and on schedule.

Dark Grey Reinforced Ergonomic School Chair - Size 5 - 11-14 Years - Grey Legs

Product code: CH15DG
Upgrade your secondary school's learning environments with the Cobolt Dark Grey Reinforced Ergonomic Chair (Size 5 / 11-14 Years). This charcoal-toned...

Inc VAT

Exc VAT

£46.00

£38.33

Height by Age - 11-14 Years
Colours - Grey

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Overview

Features

Safety & Warranty

Specifications & Dimensions

Delivery & Returns

Product FAQs

Product Overview: Size 5 Dark Grey Reinforced Secondary Chair

The Cobolt Dark Grey Reinforced Chair is the professional choice for high-traffic secondary school interiors. Delivered with Free UK Mainland Delivery, it is built to survive the "KS3 routine"—intensive daily usage, constant room transitions, and the specific ergonomic needs of growing teenagers.

The Cobolt Advantage

  • Budget Security: Our industry-leading 15-year guarantee ensures your investment is protected, serving multiple student cohorts throughout their secondary journey.
  • Venue Flexibility: Specifically designed for multi-use halls, these units stack securely up to 10 high, allowing for rapid floor clearance for exams or cleaning.
  • Smart Sorting: The non-slip feet are colour-coded to the Size 5 standard, allowing site managers to instantly identify and organise secondary-height furniture.

Ergonomics & Sustainability

  • BS EN1729 Compliance: Specifically dimensioned for the 11-14 demographic (Size 5), the shell encourages a healthy spine position to maintain concentration during long lessons.
  • Eco-Responsible: Engineered for a circular economy, the unit can be fully disassembled into metal and plastic parts for responsible local recycling.
  • Lumbar Support: The anatomically contoured backrest provides vital reinforcement, helping older students stay focused and comfortable during double periods.

Tamper-Proof Engineering

We understand that secondary school furniture must be resilient. By eliminating all external nuts and screws, we have created a seamless, anti-tamper profile that removes the risk of fixings being loosened or students damaging their uniforms on sharp edges.

The Cobolt Standard

  • 50 Years of Expertise: We have spent half a century supplying the UK public sector, ensuring every chair meets the highest benchmarks for durability and student safety.
  • Free UK Mainland Delivery: We manage all transport logistics at no extra cost, providing a transparent, budget-friendly procurement experience for your school.
  • Secondary Specialists: Our UK-based team offers dedicated support for academy refits and bulk secondary school tender requirements.

Where is this Size 5 Anti-Tilt Chair used?

The Dark Grey Reinforced Secondary Chair is a popular specification for Key Stage 3 Classrooms, Secondary ICT Suites, School Science Labs, and Academy Dining Halls. Its professional charcoal finish and specific dimensions (Size 5) make it a versatile asset for senior education providers.

Key Features

  • Anti-Tilt Geometry – Stable base design prevents dangerous backward tipping during classroom sessions.
  • Extra-Strong Undercarriage – Reinforced steel bracing ensures exceptional durability for growing students.
  • Size 5 (11-14 Years) – Correct ergonomic scaling for the early secondary school stage.
  • 15-Year Warranty – Extensive cover for the structural frame and the high-impact shell.
  • No Nuts or Screws – Anti-tamper construction ensures a smooth, blazer-safe finish.
  • Stackable 10-High – Maximises floor space efficiency in busy multi-purpose halls.
  • Colour-Coded Feet – Non-marking caps protect flooring and provide easy size identification.
  • UK Manufactured – Quality British production with a minimal environmental footprint.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service & Ethos: Supporting School Estates

  • 50 Years of Expertise: We understand the specific load-bearing and safety requirements of secondary school furniture.
  • Free Delivery (UK Mainland): We absorb shipping costs to ensure your academy budget goes further.
  • Sustainability Partners: Fully recyclable materials help your institution meet its environmental targets.
  • Reliable Support: Our experienced team provides expert guidance from product selection to final installation.

Built for Safety. Backed for Reliability.

  • The Anti-Tilt design provides a secure foundation, significantly reducing the risk of older students tipping backwards during classroom activities.
  • Compliance with BS EN1729 Part 1 ensures the 430mm seat height is ergonomically suitable for the 11-14 age group, preventing back strain.
  • The Smooth-Finish Construction eliminates the need for nuts and screws, ensuring no sharp points can catch on blazers or loose clothing.
  • A Reinforced Undercarriage adds substantial structural support, ensuring the chair can withstand the increased weight requirements of growing teenagers.
  • We offer a market-leading 15-year manufacturer's guarantee. This covers the reinforced frame and the high-impact shell, offering total peace of mind for business managers.

The Size 5 Dark Grey Reinforced Chair combines certified ergonomic support with secondary-level safety engineering. These specifications detail the heavy-duty materials and dimensions that make it the responsible choice for academies.

Age Group
11-14 Years (Size 5)
Material
Reinforced Plastic
Guarantee
15 Years
Specification
Details
Purpose / Benefit
Seat Height
430mm
Standard Size 5 for Key Stage 3
Total Dimensions
430mm(H) x 394mm(W) x 400mm(D)
Secondary-specific profile
Leg Finish
Grey Metal
Durable and professional
Construction
Reinforced Undercarriage
Enhanced structural lifespan
Safety Feature
No Nuts or Screws
Anti-tamper and blazer safe
Stacking Ability
Up to 10 High
Excellent venue management
Sustainability
Recyclable Components
Supports carbon reduction targets
Compliance
BS EN1729 Parts 1 & 2
Certified for education use
Origin
Manufactured in UK
Quality assurance

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 20 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: Size 5 Dark Grey Reinforced Secondary Seating

Q: Is "Size 5" the industry standard for Year 7, 8, and 9 students?

A: Yes. Size 5 is specifically dimensioned for the 11-to-14-year age group. With a 430mm seat height, it accommodates the average height of Key Stage 3 students, ensuring their feet are flat on the floor for optimal postural support.

Q: How does the 'Reinforced Undercarriage' differ from standard secondary chairs?

A: Secondary environments involve higher weight loads. Our reinforced model features additional steel strengthening under the seat shell, providing a more rigid frame that prevents the "splaying" often seen in cheaper non-reinforced chairs.

Q: Why is the "no nuts or screws" feature important for Year 7–9 environments?

A: At this age, students often tamper with classroom furniture. Our design removes all external fixings, making it impossible to loosen screws or remove the seat from the frame. It also prevents delicate blazers from snagging on sharp metal edges.

Q: Can these chairs be safely stacked in an exam hall?

A: Absolutely. These chairs are engineered for high-density storage. They stack stably up to **10 units high**, allowing site staff to clear large halls or multi-purpose rooms quickly and efficiently.

Q: Are the 'colour-coded feet' useful for academy campus management?

A: Yes. In a large secondary school with multiple chair sizes, the Size 5 colour-coded feet allow your facilities team to instantly identify if the correct furniture is in the correct department, saving time during room changeovers.

Q: How resistant is the Dark Grey shell to scratches and scuffs?

A: The high-grade polypropylene is colour-fast and extremely resilient. The Dark Grey charcoal tone is specifically chosen for secondary environments as it hides minor surface marks and maintains a professional look far better than lighter colours.

Q: Does this chair meet current UK educational safety standards?

A: Yes. It is fully compliant with **BS EN1729 Parts 1 & 2**. This guarantees the chair meets the specific ergonomic requirements for the 11-14 age range and has passed rigorous tests for structural strength and stability.

Q: Why should our school procurement team choose Cobolt?

A: With **50 years of expertise**, we provide school-tested solutions. We back our quality with a 15-year warranty and provide **Free UK Mainland Delivery** to ensure your project stays on budget and on schedule.

Overview

Product Overview: Size 5 Dark Grey Reinforced Secondary Chair

The Cobolt Dark Grey Reinforced Chair is the professional choice for high-traffic secondary school interiors. Delivered with Free UK Mainland Delivery, it is built to survive the "KS3 routine"—intensive daily usage, constant room transitions, and the specific ergonomic needs of growing teenagers.

The Cobolt Advantage

  • Budget Security: Our industry-leading 15-year guarantee ensures your investment is protected, serving multiple student cohorts throughout their secondary journey.
  • Venue Flexibility: Specifically designed for multi-use halls, these units stack securely up to 10 high, allowing for rapid floor clearance for exams or cleaning.
  • Smart Sorting: The non-slip feet are colour-coded to the Size 5 standard, allowing site managers to instantly identify and organise secondary-height furniture.

Ergonomics & Sustainability

  • BS EN1729 Compliance: Specifically dimensioned for the 11-14 demographic (Size 5), the shell encourages a healthy spine position to maintain concentration during long lessons.
  • Eco-Responsible: Engineered for a circular economy, the unit can be fully disassembled into metal and plastic parts for responsible local recycling.
  • Lumbar Support: The anatomically contoured backrest provides vital reinforcement, helping older students stay focused and comfortable during double periods.

Tamper-Proof Engineering

We understand that secondary school furniture must be resilient. By eliminating all external nuts and screws, we have created a seamless, anti-tamper profile that removes the risk of fixings being loosened or students damaging their uniforms on sharp edges.

The Cobolt Standard

  • 50 Years of Expertise: We have spent half a century supplying the UK public sector, ensuring every chair meets the highest benchmarks for durability and student safety.
  • Free UK Mainland Delivery: We manage all transport logistics at no extra cost, providing a transparent, budget-friendly procurement experience for your school.
  • Secondary Specialists: Our UK-based team offers dedicated support for academy refits and bulk secondary school tender requirements.

Features & Benefits

Where is this Size 5 Anti-Tilt Chair used?

The Dark Grey Reinforced Secondary Chair is a popular specification for Key Stage 3 Classrooms, Secondary ICT Suites, School Science Labs, and Academy Dining Halls. Its professional charcoal finish and specific dimensions (Size 5) make it a versatile asset for senior education providers.

Key Features

  • Anti-Tilt Geometry – Stable base design prevents dangerous backward tipping during classroom sessions.
  • Extra-Strong Undercarriage – Reinforced steel bracing ensures exceptional durability for growing students.
  • Size 5 (11-14 Years) – Correct ergonomic scaling for the early secondary school stage.
  • 15-Year Warranty – Extensive cover for the structural frame and the high-impact shell.
  • No Nuts or Screws – Anti-tamper construction ensures a smooth, blazer-safe finish.
  • Stackable 10-High – Maximises floor space efficiency in busy multi-purpose halls.
  • Colour-Coded Feet – Non-marking caps protect flooring and provide easy size identification.
  • UK Manufactured – Quality British production with a minimal environmental footprint.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service & Ethos: Supporting School Estates

  • 50 Years of Expertise: We understand the specific load-bearing and safety requirements of secondary school furniture.
  • Free Delivery (UK Mainland): We absorb shipping costs to ensure your academy budget goes further.
  • Sustainability Partners: Fully recyclable materials help your institution meet its environmental targets.
  • Reliable Support: Our experienced team provides expert guidance from product selection to final installation.

Safety & Warranty

Built for Safety. Backed for Reliability.

  • The Anti-Tilt design provides a secure foundation, significantly reducing the risk of older students tipping backwards during classroom activities.
  • Compliance with BS EN1729 Part 1 ensures the 430mm seat height is ergonomically suitable for the 11-14 age group, preventing back strain.
  • The Smooth-Finish Construction eliminates the need for nuts and screws, ensuring no sharp points can catch on blazers or loose clothing.
  • A Reinforced Undercarriage adds substantial structural support, ensuring the chair can withstand the increased weight requirements of growing teenagers.
  • We offer a market-leading 15-year manufacturer's guarantee. This covers the reinforced frame and the high-impact shell, offering total peace of mind for business managers.

Specification Dimensions

The Size 5 Dark Grey Reinforced Chair combines certified ergonomic support with secondary-level safety engineering. These specifications detail the heavy-duty materials and dimensions that make it the responsible choice for academies.

Age Group
11-14 Years (Size 5)
Material
Reinforced Plastic
Guarantee
15 Years
Specification
Details
Purpose / Benefit
Seat Height
430mm
Standard Size 5 for Key Stage 3
Total Dimensions
430mm(H) x 394mm(W) x 400mm(D)
Secondary-specific profile
Leg Finish
Grey Metal
Durable and professional
Construction
Reinforced Undercarriage
Enhanced structural lifespan
Safety Feature
No Nuts or Screws
Anti-tamper and blazer safe
Stacking Ability
Up to 10 High
Excellent venue management
Sustainability
Recyclable Components
Supports carbon reduction targets
Compliance
BS EN1729 Parts 1 & 2
Certified for education use
Origin
Manufactured in UK
Quality assurance

Delivery & Returns

FREE Delivery to UK Mainland Zone 1

Your order will be delivered on a standard 20 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: Size 5 Dark Grey Reinforced Secondary Seating

Q: Is "Size 5" the industry standard for Year 7, 8, and 9 students?

A: Yes. Size 5 is specifically dimensioned for the 11-to-14-year age group. With a 430mm seat height, it accommodates the average height of Key Stage 3 students, ensuring their feet are flat on the floor for optimal postural support.

Q: How does the 'Reinforced Undercarriage' differ from standard secondary chairs?

A: Secondary environments involve higher weight loads. Our reinforced model features additional steel strengthening under the seat shell, providing a more rigid frame that prevents the "splaying" often seen in cheaper non-reinforced chairs.

Q: Why is the "no nuts or screws" feature important for Year 7–9 environments?

A: At this age, students often tamper with classroom furniture. Our design removes all external fixings, making it impossible to loosen screws or remove the seat from the frame. It also prevents delicate blazers from snagging on sharp metal edges.

Q: Can these chairs be safely stacked in an exam hall?

A: Absolutely. These chairs are engineered for high-density storage. They stack stably up to **10 units high**, allowing site staff to clear large halls or multi-purpose rooms quickly and efficiently.

Q: Are the 'colour-coded feet' useful for academy campus management?

A: Yes. In a large secondary school with multiple chair sizes, the Size 5 colour-coded feet allow your facilities team to instantly identify if the correct furniture is in the correct department, saving time during room changeovers.

Q: How resistant is the Dark Grey shell to scratches and scuffs?

A: The high-grade polypropylene is colour-fast and extremely resilient. The Dark Grey charcoal tone is specifically chosen for secondary environments as it hides minor surface marks and maintains a professional look far better than lighter colours.

Q: Does this chair meet current UK educational safety standards?

A: Yes. It is fully compliant with **BS EN1729 Parts 1 & 2**. This guarantees the chair meets the specific ergonomic requirements for the 11-14 age range and has passed rigorous tests for structural strength and stability.

Q: Why should our school procurement team choose Cobolt?

A: With **50 years of expertise**, we provide school-tested solutions. We back our quality with a 15-year warranty and provide **Free UK Mainland Delivery** to ensure your project stays on budget and on schedule.

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