EN 1303 Construction Hardware - Lock Cylinders - Requirements and Test Methods

The European standard “EN 1303 Building hardware - Lock cylinders - Requirements and test methods” applies to cylinders and keys for locks normally used in buildings and designed for use with cylinders, having a maximum operating torque of 1,2 Nm.

This standard specifies performance and other requirements for the strength, safety, durability, performance, and corrosion resistance of cylinders and their original keys. Based on performance testing, it defines a usage category, three durability ratings, three fire resistance ratings, and four corrosion resistance ratings; six key-related safety ratings based on design requirements; and five ratings based on performance tests simulating an attack.

This standard includes satisfactory operational tests at various temperatures. It specifies the test methods to be used on cylinders and protective measures associated with these cylinders, as recommended by the manufacturer.

Corrosion resistance is specified with reference to the EN 1670 standard requirements regarding the corrosion resistance of building equipment.

The suitability of cylinders for use in fire or smoke door assemblies is determined by fire performance tests carried out in addition to the performance tests required by this standard. Since suitability for use in fire doors is not a requirement in all cases, the manufacturer has the option of stating whether the cylinder meets these additional requirements. If such a claim is made, the cylinders must comply with the requirements in Annex A.

Assessing the fire resistance of first-class doors is outside the scope of this standard document.

Sometimes additional functionalities may be needed in the design of the cylinder. Buyers should ensure that the products are suitable for their intended use.

In short, the EN 1303 standard defines the performance requirements and test methods for lock cylinders used in buildings. By ensuring cylinders possess consistent durability, safety, corrosion resistance, and other important characteristics, it allows architects, specifiers, locksmiths, and consumers to objectively compare products.

Lock cylinders are critical components of door security. The EN 1303 standard provides a standardized way to evaluate the following aspects:

• How long a cylinder will last with repeated use (durability).
• Resistance to physical attacks (such as drilling, lock picking, and impact).
• Suitability for fire doors.
• Performance in harsh environments (corrosion, temperature).

Products certified according to this standard have an 8-digit classification code, making it easy to understand their capabilities at a glance. Each position in the code represents a specific performance characteristic:

• 1. Usage category:
  • Only 1: For careful users (the wrench must withstand 2,5 Nm of torque).
• 2. Durability:
  • 4 (25.000 cycles)
  • 5 (50.000 cycles)
  • 6 (100.000 cycles)
  • For high-traffic entrances, a higher price is better.
• 3 Gate Mass:
  • Usually 0 (no requirement).
• 4. Fire resistance:
  • 0 (none)
  • A/B (Suitable for smoke/fire doors in the 2015 updated version).
• 5. Security / key operation:
  • Usually 0 or a specific number of degrees.
• 6. Corrosion and temperature resistance:
  • 0 (none)
  • A (high corrosion, no temperature)
  • B/C (with extreme temperature resistance).
• 7. Key-related security:
  • 1-6 This depends on the number of effective key variations, resistance to unlocking, impact, and similar situations.
  • Higher value means better security.
• 8 Attacks:
  • Durability rating from 0 to D: Resistance to punctures, tearing, bending, and similar damage.
  • Higher classes provide stronger physical protection.

For example, a code like 160B0C5D indicates a cylinder suitable for fire doors, featuring high durability, corrosion resistance, strong key security, and excellent resistance to impact.

The latest revision of this standard has improved the classifications (particularly for fire and intrusion resistance) compared to the previous version. It has introduced more detailed classifications for burglary resistance and adjusted the requirements to address modern security threats.

The following use the EN 1303 standard:

• Manufacturers: Test and certify the cylinders.
• Specification designers and architects select the appropriate cylinders for residential, commercial, or high-security projects.
• Locksmiths and installers: Ensures compatibility and performance.
• Regulatory bodies: Used as a reference in building codes, especially for fire safety and security.

The EN 1303 standard focuses specifically on the cylinder, not the entire lock, door, or assembly. General door security often combines this with standards such as EN 12209 (for locks) or PAS 24 (for advanced security doors). A high EN 1303 rating is excellent, but it should be part of a complete security system.

The EN 1303 standard is essential because it standardizes the performance, durability, and safety requirements of cylinders used in locks. These cylinders are small but crucial components that determine whether a key can securely open a door. This standard is considered important for the following reasons:

• Security against attacks: Lock cylinders are often the first target in forced entry attempts. This standard evaluates resistance to common attack methods such as drilling, pulling, twisting, unlocking, and torsion attacks (attempts to bend or break).
• Durability and reliability: A cylinder is used thousands of times over its lifespan. The following testing methods help ensure the lock continues to function, not becoming stiff, unreliable, or jammed, even after years of daily use:
  • Operating durability (number of lock-on cycles)
  • Key insertion and turning performance
  • Wear resistance of internal pins, springs and moving parts.
• Safety and emergency function: This standard checks whether the cylinders can operate safely under practical building conditions, including:
  • Emergency exit compatibility
  • Where applicable, proper work from both sides.
  • Resistance to misuse or partial key insertion problems.
• Interchangeability across Europe: This standard creates size and performance consistency so that manufacturers can design cylinders that fit common lock cases and doors used across Europe.
• Net classification system: This standard uses a classification code that rates characteristics such as Use category, durability, fire resistance, security, corrosion resistance, key-related security, and vandal resistance.

Consequently, the EN 1303 standard is the benchmark for quality lock cylinders throughout Europe. When purchasing a cylinder, always look for the 8-digit code and verify whether it meets the requirements (e.g., high durability for apartments, strong impact resistance for commercial properties, fire rating for escape routes).

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the EN 1303 standard.