A dark green ergonomic school chair with a stain-resistant polypropylene shell and a sturdy grey frame built for high-use educational environments.
Vibrant emerald green classroom seat featuring non-marking floor glides and a safety-focused leg design to ensure student stability during lessons.
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 5 Green Anti-Tilt Secondary Seating

The Cobolt Green Size 5 Chair delivers a durable, adult-strength foundation for students aged 11 to 14 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and constant movement required in modern high school facilities.

Senior Posture & Sustainability

  • KS3 Ergonomic Standards: Adhering to Size 5 EN1729 regulations, the 430mm seat height ensures mid-secondary students maintain a healthy lumbar position while keeping feet firmly planted.
  • Improved Blood Flow: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during double periods or exam sessions.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.

Institutional Durability

  • High-Impact Shell: The non-porous emerald shell resists staining from ink and school chemicals, allowing for instant sanitisation with standard cleaners.
  • Vandal-Resistant Fixings: We utilize industrial-grade, tamperproof fasteners to lock the seat to the grey steel frame, ensuring a permanent, rattle-free connection.
  • Efficient Space Management: These units are designed for safe vertical stacking, allowing cleaning teams to clear floor areas quickly after the academic day ends.

The Cobolt Standard

  • 50 Years of Manufacturing Excellence: For half a century, we have remained a trusted partner to the UK public sector, delivering furniture that leads the market in safety and compliance.
  • Complimentary Mainland Transit: Every purchase includes Free UK Mainland Delivery as standard, allowing bursars to calculate exact project costs without hidden shipping variables.
  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your secondary furniture remains a reliable, one-time investment.

Where is this Size 5 Green Anti-Tilt Chair utilised?

The Green Size 5 School Chair is the primary specification for Key Stage 3 Classrooms, Senior School IT Suites, Science Laboratories, and Secondary Libraries. Its adult-strength frame combined with student-specific proportions makes it a versatile solution for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear legs proactively inhibit students from rocking back, reducing secondary classroom accidents.
  • Size 5 (11-14 Years) – Precision-engineered 430mm seat height for the mid-secondary age demographic.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both the welded steel frame and the high-impact shell.
  • 4.3kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Slate Grey Powder-Coating – A high-quality metallic finish that resists scratches, scuffs, and daily wear.
  • Stackable Architecture – Efficient vertical stacking allows for easy classroom reconfiguration and space management.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and staining, allowing for instant sanitisation.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached to the frame.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Secondary Schools

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of high-traffic senior school environments.
  • Free UK Mainland Delivery: We manage the delivery of institutional refits at no extra cost, keeping your project within allocated budgets.
  • 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 demographics.

Secondary Safety Engineering. Guaranteed Performance.

  • The Anti-Tilt rear geometry is a critical design feature for secondary learners, shifting the balance point to proactively prevent dangerous tipping habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (430mm) is perfectly scaled for the 11-14 year old stature, promoting healthy spinal habits.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or exam sessions.
  • 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 institutional use.

The Size 5 Green Anti-Tilt Chair combines certified secondary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Key Stage 3 learning environments.

Target Ages
11-14 Years (Size 5)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
430mm
Standard Size 5 for Year 7 through Year 9
Seat Dimensions
405mm (W) x 380mm (D)
Ergonomically sized for mid-secondary students
Total Dimensions
800mm(H) x 460mm(W) x 550mm(D)
Stable secondary classroom profile
Unit Weight
4.3kg
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
Sustainability
100% Recyclable
Eco-friendly product lifecycle

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 Secondary Classroom Seating

Q: Is a "Size 5" chair correct for Years 7 through 9?

A: Size 5 (430mm seat height) is the ergonomic standard for students aged 11 to 14 years. It ensures that secondary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during high school.

Q: How does the "Anti-Tilt" mechanism proactively prevent falls?

A: Secondary students are often active and prone to rocking on their chairs. The angled rear frame shifts the leverage point further back, making it mechanically difficult for the chair to tip backwards, thereby proactively preventing accidents.

Q: Is the Emerald Green shell resistant to staining?

A: Yes. The high-grade polypropylene shell is non-porous. Spills from ink, school supplies, or juice cannot penetrate the surface and can be wiped away easily without leaving residues or fading the vivid verdant colour.

Q: Can adults safely sit on these Size 5 chairs?

A: Yes. Despite being dimensioned for students, the powder-coated steel frame is rated for a massive 125kg. This makes it perfectly safe for teaching staff to sit briefly during group sessions without structural risk.

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

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: 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 4.3kg build makes them easy to move for reconfiguration.

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 UK school furniture regarding ergonomics, strength, and structural durability.

Q: Why purchase from Cobolt Furniture?

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

Overview

Product Overview: Size 5 Green Anti-Tilt Secondary Seating

The Cobolt Green Size 5 Chair delivers a durable, adult-strength foundation for students aged 11 to 14 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and constant movement required in modern high school facilities.

Senior Posture & Sustainability

  • KS3 Ergonomic Standards: Adhering to Size 5 EN1729 regulations, the 430mm seat height ensures mid-secondary students maintain a healthy lumbar position while keeping feet firmly planted.
  • Improved Blood Flow: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during double periods or exam sessions.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.

Institutional Durability

  • High-Impact Shell: The non-porous emerald shell resists staining from ink and school chemicals, allowing for instant sanitisation with standard cleaners.
  • Vandal-Resistant Fixings: We utilize industrial-grade, tamperproof fasteners to lock the seat to the grey steel frame, ensuring a permanent, rattle-free connection.
  • Efficient Space Management: These units are designed for safe vertical stacking, allowing cleaning teams to clear floor areas quickly after the academic day ends.

The Cobolt Standard

  • 50 Years of Manufacturing Excellence: For half a century, we have remained a trusted partner to the UK public sector, delivering furniture that leads the market in safety and compliance.
  • Complimentary Mainland Transit: Every purchase includes Free UK Mainland Delivery as standard, allowing bursars to calculate exact project costs without hidden shipping variables.
  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your secondary furniture remains a reliable, one-time investment.

Features & Benefits

Where is this Size 5 Green Anti-Tilt Chair utilised?

The Green Size 5 School Chair is the primary specification for Key Stage 3 Classrooms, Senior School IT Suites, Science Laboratories, and Secondary Libraries. Its adult-strength frame combined with student-specific proportions makes it a versatile solution for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear legs proactively inhibit students from rocking back, reducing secondary classroom accidents.
  • Size 5 (11-14 Years) – Precision-engineered 430mm seat height for the mid-secondary age demographic.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both the welded steel frame and the high-impact shell.
  • 4.3kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Slate Grey Powder-Coating – A high-quality metallic finish that resists scratches, scuffs, and daily wear.
  • Stackable Architecture – Efficient vertical stacking allows for easy classroom reconfiguration and space management.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and staining, allowing for instant sanitisation.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached to the frame.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Secondary Schools

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of high-traffic senior school environments.
  • Free UK Mainland Delivery: We manage the delivery of institutional refits at no extra cost, keeping your project within allocated budgets.
  • 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 demographics.

Safety & Warranty

Secondary Safety Engineering. Guaranteed Performance.

  • The Anti-Tilt rear geometry is a critical design feature for secondary learners, shifting the balance point to proactively prevent dangerous tipping habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (430mm) is perfectly scaled for the 11-14 year old stature, promoting healthy spinal habits.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or exam sessions.
  • 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 institutional use.

Specification Dimensions

The Size 5 Green Anti-Tilt Chair combines certified secondary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Key Stage 3 learning environments.

Target Ages
11-14 Years (Size 5)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
430mm
Standard Size 5 for Year 7 through Year 9
Seat Dimensions
405mm (W) x 380mm (D)
Ergonomically sized for mid-secondary students
Total Dimensions
800mm(H) x 460mm(W) x 550mm(D)
Stable secondary classroom profile
Unit Weight
4.3kg
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
Sustainability
100% Recyclable
Eco-friendly product lifecycle

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 Secondary Classroom Seating

Q: Is a "Size 5" chair correct for Years 7 through 9?

A: Size 5 (430mm seat height) is the ergonomic standard for students aged 11 to 14 years. It ensures that secondary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during high school.

Q: How does the "Anti-Tilt" mechanism proactively prevent falls?

A: Secondary students are often active and prone to rocking on their chairs. The angled rear frame shifts the leverage point further back, making it mechanically difficult for the chair to tip backwards, thereby proactively preventing accidents.

Q: Is the Emerald Green shell resistant to staining?

A: Yes. The high-grade polypropylene shell is non-porous. Spills from ink, school supplies, or juice cannot penetrate the surface and can be wiped away easily without leaving residues or fading the vivid verdant colour.

Q: Can adults safely sit on these Size 5 chairs?

A: Yes. Despite being dimensioned for students, the powder-coated steel frame is rated for a massive 125kg. This makes it perfectly safe for teaching staff to sit briefly during group sessions without structural risk.

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

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: 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 4.3kg build makes them easy to move for reconfiguration.

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 UK school furniture regarding ergonomics, strength, and structural durability.

Q: Why purchase from Cobolt Furniture?

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

Green Anti-Tilt Secondary School Chair - Size 5 - 11-14 Years - Grey Legs

Product code: CH45GR
Integrate a calming, natural aesthetic into your secondary learning environments with the Cobolt Emerald Green Polypropylene Anti-Tilt Chair (Size 5 /...

Inc VAT

Exc VAT

£56.00

£46.67

Colours - Lime Green
Age - 11-14 Years

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Trusted UK Supplier 50 years. Established. Reliable.

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Overview

Features

Safety & Warranty

Specifications & Dimensions

Delivery & Returns

Product FAQs

Product Overview: Size 5 Green Anti-Tilt Secondary Seating

The Cobolt Green Size 5 Chair delivers a durable, adult-strength foundation for students aged 11 to 14 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and constant movement required in modern high school facilities.

Senior Posture & Sustainability

  • KS3 Ergonomic Standards: Adhering to Size 5 EN1729 regulations, the 430mm seat height ensures mid-secondary students maintain a healthy lumbar position while keeping feet firmly planted.
  • Improved Blood Flow: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during double periods or exam sessions.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.

Institutional Durability

  • High-Impact Shell: The non-porous emerald shell resists staining from ink and school chemicals, allowing for instant sanitisation with standard cleaners.
  • Vandal-Resistant Fixings: We utilize industrial-grade, tamperproof fasteners to lock the seat to the grey steel frame, ensuring a permanent, rattle-free connection.
  • Efficient Space Management: These units are designed for safe vertical stacking, allowing cleaning teams to clear floor areas quickly after the academic day ends.

The Cobolt Standard

  • 50 Years of Manufacturing Excellence: For half a century, we have remained a trusted partner to the UK public sector, delivering furniture that leads the market in safety and compliance.
  • Complimentary Mainland Transit: Every purchase includes Free UK Mainland Delivery as standard, allowing bursars to calculate exact project costs without hidden shipping variables.
  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your secondary furniture remains a reliable, one-time investment.

Where is this Size 5 Green Anti-Tilt Chair utilised?

The Green Size 5 School Chair is the primary specification for Key Stage 3 Classrooms, Senior School IT Suites, Science Laboratories, and Secondary Libraries. Its adult-strength frame combined with student-specific proportions makes it a versatile solution for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear legs proactively inhibit students from rocking back, reducing secondary classroom accidents.
  • Size 5 (11-14 Years) – Precision-engineered 430mm seat height for the mid-secondary age demographic.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both the welded steel frame and the high-impact shell.
  • 4.3kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Slate Grey Powder-Coating – A high-quality metallic finish that resists scratches, scuffs, and daily wear.
  • Stackable Architecture – Efficient vertical stacking allows for easy classroom reconfiguration and space management.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and staining, allowing for instant sanitisation.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached to the frame.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Secondary Schools

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of high-traffic senior school environments.
  • Free UK Mainland Delivery: We manage the delivery of institutional refits at no extra cost, keeping your project within allocated budgets.
  • 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 demographics.

Secondary Safety Engineering. Guaranteed Performance.

  • The Anti-Tilt rear geometry is a critical design feature for secondary learners, shifting the balance point to proactively prevent dangerous tipping habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (430mm) is perfectly scaled for the 11-14 year old stature, promoting healthy spinal habits.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or exam sessions.
  • 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 institutional use.

The Size 5 Green Anti-Tilt Chair combines certified secondary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Key Stage 3 learning environments.

Target Ages
11-14 Years (Size 5)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
430mm
Standard Size 5 for Year 7 through Year 9
Seat Dimensions
405mm (W) x 380mm (D)
Ergonomically sized for mid-secondary students
Total Dimensions
800mm(H) x 460mm(W) x 550mm(D)
Stable secondary classroom profile
Unit Weight
4.3kg
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
Sustainability
100% Recyclable
Eco-friendly product lifecycle

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 Secondary Classroom Seating

Q: Is a "Size 5" chair correct for Years 7 through 9?

A: Size 5 (430mm seat height) is the ergonomic standard for students aged 11 to 14 years. It ensures that secondary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during high school.

Q: How does the "Anti-Tilt" mechanism proactively prevent falls?

A: Secondary students are often active and prone to rocking on their chairs. The angled rear frame shifts the leverage point further back, making it mechanically difficult for the chair to tip backwards, thereby proactively preventing accidents.

Q: Is the Emerald Green shell resistant to staining?

A: Yes. The high-grade polypropylene shell is non-porous. Spills from ink, school supplies, or juice cannot penetrate the surface and can be wiped away easily without leaving residues or fading the vivid verdant colour.

Q: Can adults safely sit on these Size 5 chairs?

A: Yes. Despite being dimensioned for students, the powder-coated steel frame is rated for a massive 125kg. This makes it perfectly safe for teaching staff to sit briefly during group sessions without structural risk.

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

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: 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 4.3kg build makes them easy to move for reconfiguration.

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 UK school furniture regarding ergonomics, strength, and structural durability.

Q: Why purchase from Cobolt Furniture?

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

Overview

Product Overview: Size 5 Green Anti-Tilt Secondary Seating

The Cobolt Green Size 5 Chair delivers a durable, adult-strength foundation for students aged 11 to 14 years. Dispatched with Free UK Mainland Delivery, it is built to survive the high-frequency cleaning and constant movement required in modern high school facilities.

Senior Posture & Sustainability

  • KS3 Ergonomic Standards: Adhering to Size 5 EN1729 regulations, the 430mm seat height ensures mid-secondary students maintain a healthy lumbar position while keeping feet firmly planted.
  • Improved Blood Flow: The downward-curved front edge removes pressure points behind the knees, preventing restlessness during double periods or exam sessions.
  • Eco-Responsible Lifecycle: Constructed from 100% recyclable polypropylene and steel, this chair supports your institution's carbon reduction targets.

Institutional Durability

  • High-Impact Shell: The non-porous emerald shell resists staining from ink and school chemicals, allowing for instant sanitisation with standard cleaners.
  • Vandal-Resistant Fixings: We utilize industrial-grade, tamperproof fasteners to lock the seat to the grey steel frame, ensuring a permanent, rattle-free connection.
  • Efficient Space Management: These units are designed for safe vertical stacking, allowing cleaning teams to clear floor areas quickly after the academic day ends.

The Cobolt Standard

  • 50 Years of Manufacturing Excellence: For half a century, we have remained a trusted partner to the UK public sector, delivering furniture that leads the market in safety and compliance.
  • Complimentary Mainland Transit: Every purchase includes Free UK Mainland Delivery as standard, allowing bursars to calculate exact project costs without hidden shipping variables.
  • Fifteen-Year Financial Shield: Our extensive structural warranty provides unparalleled budget protection, ensuring your secondary furniture remains a reliable, one-time investment.

Features & Benefits

Where is this Size 5 Green Anti-Tilt Chair utilised?

The Green Size 5 School Chair is the primary specification for Key Stage 3 Classrooms, Senior School IT Suites, Science Laboratories, and Secondary Libraries. Its adult-strength frame combined with student-specific proportions makes it a versatile solution for diverse educational settings.

Key Features

  • Anti-Tilt Safety Frame – The angled rear legs proactively inhibit students from rocking back, reducing secondary classroom accidents.
  • Size 5 (11-14 Years) – Precision-engineered 430mm seat height for the mid-secondary age demographic.
  • 15-Year Structural Guarantee – Industry-leading warranty covering both the welded steel frame and the high-impact shell.
  • 4.3kg Unit Weight – Robust construction that remains manageable for staff to move and stack.
  • Slate Grey Powder-Coating – A high-quality metallic finish that resists scratches, scuffs, and daily wear.
  • Stackable Architecture – Efficient vertical stacking allows for easy classroom reconfiguration and space management.
  • High-Impact Polypropylene – The shell is resistant to ink, school chemicals, and staining, allowing for instant sanitisation.
  • Tamperproof Shell Fasteners – Secured fixings ensure the seat remains permanently and safely attached to the frame.
Warranty icon
15-year manufacturer guarantee
Free delivery icon
Free UK Mainland Delivery
UK manufactured icon
Made in UK

Cobolt Service: Partnering with UK Secondary Schools

  • 50 Years of Expertise: We understand the specific durability and hygiene needs of high-traffic senior school environments.
  • Free UK Mainland Delivery: We manage the delivery of institutional refits at no extra cost, keeping your project within allocated budgets.
  • 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 demographics.

Safety & Warranty

Secondary Safety Engineering. Guaranteed Performance.

  • The Anti-Tilt rear geometry is a critical design feature for secondary learners, shifting the balance point to proactively prevent dangerous tipping habits.
  • Strict adherence to BS EN1729 Compliance ensures the seat height (430mm) is perfectly scaled for the 11-14 year old stature, promoting healthy spinal habits.
  • The Waterfall Seat Front eliminates hard edges behind the knees, maintaining healthy circulation during extended seated learning or exam sessions.
  • 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 institutional use.

Specification Dimensions

The Size 5 Green Anti-Tilt Chair combines certified secondary ergonomics with a heavy-duty safety frame. These specifications detail the materials and dimensions that make it the responsible choice for Key Stage 3 learning environments.

Target Ages
11-14 Years (Size 5)
Material
100% Polypropylene
Guarantee
15 Years
Specification
Details
Institutional Benefit
Seat Height
430mm
Standard Size 5 for Year 7 through Year 9
Seat Dimensions
405mm (W) x 380mm (D)
Ergonomically sized for mid-secondary students
Total Dimensions
800mm(H) x 460mm(W) x 550mm(D)
Stable secondary classroom profile
Unit Weight
4.3kg
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
Sustainability
100% Recyclable
Eco-friendly product lifecycle

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 Secondary Classroom Seating

Q: Is a "Size 5" chair correct for Years 7 through 9?

A: Size 5 (430mm seat height) is the ergonomic standard for students aged 11 to 14 years. It ensures that secondary students can sit with a flat-footed stance, essential for maintaining correct sitting habits during high school.

Q: How does the "Anti-Tilt" mechanism proactively prevent falls?

A: Secondary students are often active and prone to rocking on their chairs. The angled rear frame shifts the leverage point further back, making it mechanically difficult for the chair to tip backwards, thereby proactively preventing accidents.

Q: Is the Emerald Green shell resistant to staining?

A: Yes. The high-grade polypropylene shell is non-porous. Spills from ink, school supplies, or juice cannot penetrate the surface and can be wiped away easily without leaving residues or fading the vivid verdant colour.

Q: Can adults safely sit on these Size 5 chairs?

A: Yes. Despite being dimensioned for students, the powder-coated steel frame is rated for a massive 125kg. This makes it perfectly safe for teaching staff to sit briefly during group sessions without structural risk.

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

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: 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 4.3kg build makes them easy to move for reconfiguration.

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 UK school furniture regarding ergonomics, strength, and structural durability.

Q: Why purchase from Cobolt Furniture?

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

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