SDC Z7850LRQG Selectric Pro Electrified Deadbolt Strike

We've deployed the SDC Z7850LRQG across university campuses, corporate office towers, and government facilities — and the multi-credential flexibility is the real-world hero. Most integrators spec electrified strikes based on immediate credential standardization, which almost never happens on schedule. In our experience, the Z7850LRQG buys you operational breathing room. Legacy 125kHz badge holders coexist with new NFC smartphone enrollment; no forced cutover dates, no angry employee email chains about "your new badge doesn't work yet." From a deployment perspective, the strike is mechanically straightforward — standard 24VDC deadbolt solenoid architecture, retrofit-compatible door-frame cutouts, familiar failsafe/fail-secure relay logic. OSDP and TCP/IP protocols also mean zero proprietary gateway hardware: connect it directly to your Allegion, Salto, or Hanwha access control system and start logging events immediately. The 63-door and 250K-user limits are real boundaries worth testing in your topology before final spec — this is a distributed strike with local credential database, not a cloud-managed device. On a 100-door campus, you're running two or three Z7850LRQG units with synchronized access lists; on a 500-door enterprise, you're likely evaluating a hosted access-control platform instead. But for the sweet spot — 20 to 60 doors across a single facility with heterogeneous credential legacy — this strike solves a genuine pain point.

Technical Highlights:

• OSDP and TCP/IP Dual Protocol: Eliminates proprietary gateway dependency. OSDP carries real-time access events and secure key exchange; TCP/IP adds remote diagnostics and integration with IP camera systems. Both protocols run simultaneously without conflict — you choose integration path based on existing infrastructure (legacy Wiegand + IP, or pure IP-native).
• DESFire, MIFARE, NFC/13.56MHz, and 125kHz Prox on One Strike: No reader duplication, no format-specific wiring. Credential enrollment happens in your access control software; the strike hardware handles all four formats. Real deployment benefit: credential migration happens at your pace, not on a forced cutover timeline.
• 24VDC Deadbolt Solenoid: Low-voltage operation — integrates with standard door power supplies and 24VDC UPS systems. Failsafe (unlocked on power loss) or fail-secure (locked on power loss) selectable via door relay — no external configuration switches. Mechanically familiar to install technicians who have dealt with conventional strike hardware.
• 250,000 User Accounts Across 63 Doors: Local credential database on the strike — no cloud dependency, no network latency penalty on access decisions. Scaling beyond 63 doors requires secondary Z7850LRQG units with synchronized ACL via OSDP mesh or TCP/IP gateway. Verify your topological constraints before final spec.
• Retrofit Compatibility: Drop-in replacement for most mechanical deadbolt strikes. Door-frame cutouts and latch geometry are standard; eliminates costly door replacement or frame modification on retrofit projects. New construction also benefits — spec the Z7850LRQG early and standardize on one strike type across the entire building.

Deployment Considerations:

• Credential database synchronization: On multi-unit installations (2+ Z7850LRQG units), access lists must sync via your access control panel or TCP/IP gateway. Test synchronization latency and conflict-resolution behavior before go-live; delayed sync can lock out legitimate users temporarily.
• Door power supply sizing: Verify your 24VDC power supply has sufficient amperage for the solenoid coil draw, especially if powering multiple strikes from a single supply. Standard door power supplies (5–10A) typically handle 3–4 Z7850LRQG units; confirm with SDC or your power vendor.
• Failsafe vs. fail-secure selection: Failsafe (unlocked on power loss) is appropriate for emergency egress doors; fail-secure (locked on power loss) is standard for entrance and controlled-access doors. Select the mode based on building code and occupancy type before installation — changing it later requires relay rewiring.
• Network segmentation and OSDP security: OSDP supports secure key exchange; ensure your access control platform negotiates session keys with the strike on first connection. Do not run unencrypted OSDP across untrusted networks or wireless mesh systems.
• Credential enrollment workflow: Test your access control software's credential enrollment for all four formats (DESFire, MIFARE, NFC, 125kHz Prox) before rolling out to end users. Some platforms require firmware updates or plugin installation to support all formats; lag time can delay deployment.

The Z7850LRQG is the right choice for organizations managing credential-format diversity or planning multi-year migration strategies. It eliminates hardware obsolescence on format changes and simplifies technician support by consolidating strike types. Integrators and facility managers looking to standardize on a single electrified deadbolt strike across mixed-credential environments should evaluate it against single-format alternatives. See the SDC catalog for additional electrified lock and strike options.