SR2 & SR3 Rated Steel Doors
Protect high-risk areas with professionally specified SR2 and SR3-rated steel security doors engineered for demanding commercial and industrial environments.
Sentry Automation specialises in the specification, supply, installation, repair, service, and maintenance of certified steel security doors designed to resist forced attack while maintaining long-term durability and operational reliability.
Our doors are certified to LPCB LPS 1175 security standards, providing proven resistance to sustained attack using a range of tools and methods. These systems are ideal for sites where security performance and compliance cannot be compromised.
QUALIFIED | CERTIFIED | TRUSTED
Engineered for High-Risk Environments
SR2 and SR3 steel doors are designed to deliver enhanced protection in locations where security threats, operational demands, and environmental exposure are significant.
Our systems provide:
- Certified forced-attack resistance
- Reinforced steel leaf and frame construction
- High-security locking systems and attack-resistant hardware
- Long-term durability in demanding industrial environments
- Reliable performance in high-usage locations
These doors are commonly used across industrial sites, logistics facilities, utilities, data centres, and secure commercial buildings.
SR2 vs SR3 – Choosing the Right Security Rating
Selecting the correct security rating ensures the right level of protection without unnecessary cost or complexity. We support clients in selecting the appropriate door specification based on risk assessment, threat level, and operational requirements.
SR2 Rated Steel Doors
Designed to resist opportunistic and determined attacks using basic hand tools for a defined attack duration. Suitable for moderate-risk commercial and industrial environments.
Typical applications include:
- Commercial buildings and warehouses
- Industrial units and workshops
- External plant rooms and service areas
- Controlled internal security zones
SR3 Rated Steel Doors
Provides increased resistance to sustained, aggressive attacks using a wider range of tools. Specified where enhanced delay, deterrence, and asset protection are required.
Typical applications include:
- Critical infrastructure and utilities
- Data centres and secure technical areas
- Logistics hubs and distribution centres
- High-value industrial and commercial sites
Additional Performance Options
Our SR2 and SR3 rated steel doors can be configured with additional performance features to meet building compliance and operational requirements:
- Fire-rated options available up to FD60
- Acoustic performance to reduce noise transmission
- Insulated door construction to improve thermal performance and U-values
- Marine-grade protective coatings for coastal or corrosive environments
- Weather-resistant and high-cycle durability options
- Single and double leaf configurations for personnel or equipment access
Each door set is tailored to suit the specific needs of the building and environment.
Professional Specification & Installation
We work closely with security consultants, contractors, and facilities managers to ensure the correct door rating and configuration is specified. Our experienced engineers manage the complete process from specification and supply through to installation and commissioning, ensuring compliance, reliability, and long-term performance.
Repairs, Servicing & Maintenance
Security doors must remain fully operational and compliant. We provide:
- Fault diagnosis and repairs
- Locking mechanism and hardware replacement
- Door alignment and hinge servicing
- Compliance inspections and safety checks
- Planned preventative maintenance contracts
Routine servicing ensures ongoing security performance and extends the lifespan of your door systems.
Ideal For…
- Industrial sites and manufacturing facilities
- Data centres and secure technical rooms
- Utilities and critical infrastructure
- Logistics hubs and distribution centres
- Plant rooms and restricted service areas
- High-security commercial premises
Why Choose Us?
- Specialists in certified high-security steel doors
- Full service: supply, install, repair, and maintain
- LPCB LPS 1175 compliant security solutions
- Experienced engineers and professional installation
- Long-term reliability and maintenance support