Security Doors - LPS1175 Security Level 4

When only the highest level of protection will do, LPS 1175 Issue 7 SR4 Steel Security Doors from Security Direct deliver industry-leading strength, certification, and peace of mind.
Our Securidor+ S4 range is tested and approved by the Loss Prevention Certification Board (LPCB) to LPS 1175 SR4, ensuring exceptional resistance to forced entry using heavy-duty tools such as felling axes, disc grinders, and crowbars.

Designed for extreme-risk environments, these doors are ideal for:

• Ministry of Defence and Government facilities
• Banks and data centres
• Utilities, substations, and critical infrastructure
• Home Office-approved gun rooms and other high-security applications

Engineered for Maximum Strength and Endurance

Each SR4 Steel Security Door is built to withstand prolonged and aggressive attack attempts.  The 45mm-thick door leaf features 1.5mm galvanised steel sheets on both the inner and outer faces, with an integral astragal lip on the closing edge for enhanced protection.

This heavy-duty construction provides an approximate weight of 80kg per m², giving it exceptional rigidity and impact resistance. The welded frame, manufactured from high-tensile galvanised steel, is reinforced at hinges, lock keeps, and fixing points, ensuring the entire door set remains secure even under extreme pressure.

High-Security Hardware & Locking Options

Our LPS 1175 SR4 doors are available with over 100 certified locking options, providing complete flexibility for your security and operational requirements.

Options include:

• Single-point or multi-point bolting systems for maximum intrusion resistance
• Personnel, panic, and escape hardware, compliant with BS EN 179 and BS EN 1125 standards
• Optional key registration systems and restricted cylinders to prevent unauthorised key duplication
• A selection of handles, closers, push bars, and automatic locking mechanisms for custom control and accessibility

Every door is tested and configured to meet your exact specification, ensuring optimum performance in demanding environments.

Design Flexibility & Functional Enhancements

While built for strength, the SR4 Steel Door range also offers a high degree of customisation and aesthetic flexibility.  Choose from an extensive selection of RAL and BS powder-coated finishes, ensuring your door complements your building’s appearance while maintaining superior corrosion resistance.