Hirsch 4000 Clamshell Prox Card - 36 Bit N901157A

The Hirsch 4000 Clamshell Proximity Card is designed for organizations utilizing 125kHz proximity credential technology with 36-bit N901157A formatting. Featuring a rugged clamshell construction, these credentials are built for long-term durability and consistent performance in demanding access control environments. The 36-bit N901157A format is commonly used in Napco-compatible proximity systems.

The reinforced design makes these cards well suited for high-traffic facilities such as commercial buildings, healthcare campuses, educational institutions, government facilities, and industrial sites where credentials are used frequently throughout the day. The durable housing helps ensure reliable operation in compatible 125kHz proximity reader systems over extended daily use.

Unlike printable ISO cards, the clamshell format is optimized for durability and longevity rather than visual customization, making it ideal for environments where long-lasting credential performance is the primary requirement.

Programmed using 36-bit N901157A formatting, these credentials support structured encoding for secure and scalable access control system deployments. The N901157A format supports a facility code range of 0–255 and card numbering range of 0–67,108,863.

• 125kHz proximity credential technology
• 36-bit N901157A formatting
• Durable clamshell card construction
• Designed for high-traffic environments
• Long-lasting wear-resistant design
• Reliable performance for daily access control use
• Supports structured credential encoding
• Cost-effective high-durability solution