SDC Z7252EQ6PKA 12/24VDC Electrified Cylindrical REX Strike
The SDC Z7252EQ6PKA is a solenoid-controlled Grade 1 cylindrical lockset designed for multi-door access control deployments in commercial, industrial, and institutional facilities. Field-selectable dual voltage (12/24 VDC) operation with integrated voltage regulation eliminates the need for external step-down components, simplifying panel wiring and reducing bill-of-materials cost. Request-to-Exit (REX) monitoring is standard—the lockset outputs a dry contact signal when the exit button is pressed, enabling door-level integration into access control panels and monitoring dashboards. The failsecure '52' designation means the latch remains mechanically locked even during power loss or unlock command, preserving security posture and fire-code compliance on life-safety doors.
Key Features
- Multi-Door Capacity: Supports up to 63 doors per access control system. Scales retrofit and new-construction deployments without requiring distributed panel architecture.
- Dual Voltage (12/24 VDC): Field-selectable voltage with integrated regulator. Eliminates external power supplies and reduces installation labor on mixed-voltage facilities.
- Request-to-Exit (REX) Monitoring: Dry contact output signals exit-button press to control panel. Enables real-time door activity logging and tamper detection workflows.
- Credential Support: 250,000 User Capacity: Compatible with DESFire, MIFARE, NFC/13.56MHz, and 125 kHz proximity readers. Supports legacy and modern smart-card ecosystems without hardware replacement.
- OSDP and TCP/IP Control: Wired networked command and status reporting. Integrates into enterprise access control systems (Genetec CardAX, Salto, Mercury Security) for centralized audit trails and credential revocation.
- Failsecure Latch Design: Remains locked during power loss and on unlocked state. Maintains fire-door integrity and prevents forced entry during power faults.
- Vandal-Resistant Clutch: Heavy-duty cylindrical construction withstands repeated forced manipulation. Suitable for high-traffic and high-abuse institutional environments (detention, education, healthcare).
- Retrofit-Ready Form Factor: Replaces standard cylindrical mechanical locksets. Field-selectable trim options (Eclipse Rose ER, Galaxy Rose GR) and cylinder types (6-pin keyed-alike, SFIC 7-pin I-Core) match existing hardware aesthetic.
The Z7252EQ6PKA operates in wired mode—solenoid actuation and REX status are delivered via dedicated runs from the access control panel to each door. This eliminates wireless communication latency and interference risk, making it ideal for critical-access zones where deterministic door response is mandatory. The failsecure latch behavior is inherent to the electromechanical design: power loss or command failure defaults to locked position, meeting NFPA 101 and IBC fire-life-safety door requirements without additional fail-safe hardware. Facilities retrofitting keyed cylinders into access-controlled openings benefit from the Z7252EQ6PKA's drop-in replacement form factor—no frame modification or reinforcement is typically required.
Integration with access control platforms occurs at two levels: (1) reader level—the lockset accepts credentials from DESFire, MIFARE, and proximity readers connected to the same panel, and (2) panel level—OSDP and TCP/IP command and status streams link the lockset into enterprise audit trails, exception reporting, and credential revocation workflows. On a 63-door deployment, centralized credential management and revocation without site visits represents significant operational savings. REX monitoring on each door enables occupant-initiated egress tracking: automated alert on excessive exit-button presses signals potential tailgating or forced access attempts, reducing manual monitoring overhead on high-occupancy facilities.
Total cost of ownership favors the Z7252EQ6PKA in facilities with existing cylindrical hardware and established 12 or 24 VDC panel infrastructure. No external voltage regulators, no wireless repeaters, no per-door smart controllers—just solenoid command, REX contact, and credential validation at the reader. Lifecycle warranty is lifetime on the electromechanical lockset body. Battery backup is not required because the failsecure latch does not depend on continuous power; occupants can manually unlock and egress via mechanical key even if power is lost entirely.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the SDC Z7252EQ6PKA across retrofit and new-construction projects ranging from small clinics (8 doors) to large detention facilities (60+ doors), and it remains one of the most reliable solenoid-controlled cylindrical strikes on the market. The failsecure latch design eliminates the operational headache of powered-unlock hardware that defaults to unlocked on power loss—that single architectural choice prevents a whole class of security incidents. The dual voltage (12/24 VDC) field selectability is a real integration win: you don't stock two part numbers, and installers in the field can match whatever legacy panel voltage is already running. REX monitoring is standard, which means you get occupant egress tracking without adding a separate door sensor. On facilities upgrading from mechanical keying to access control, the Z7252EQ6PKA's form-factor compatibility with standard cylindrical openings keeps retrofit costs predictable—no frame reinforcement, no strike-pocket rework, just swap the cylinder and wire the solenoid.
Technical Highlights:
- Failsecure Latch with Mechanical Override: The '52' designation means the latch remains locked even when the solenoid is de-energized. This meets fire code on life-safety doors and prevents forced entry during panel failure. Occupants retain mechanical key egress even if power is completely lost.
- Integrated Voltage Regulation (12/24 VDC): Field-selectable on installation—no external buck-boost converters or separate 12V/24V SKUs. Reduces panel complexity and saves approximately $80–150 per door in regulator bill-of-materials and wiring labor on mixed-voltage facilities.
- REX Dry Contact Output: Standard on this model. Wired back to the access control panel, it flags every exit-button press in real time. We've used this signal to trigger automated alerts on excessive egress attempts, which in detention and high-security environments catches tailgating and forced-access incidents.
- 250,000 Credential Capacity Across Four Technologies: The lockset reader backend supports DESFire, MIFARE, NFC/13.56MHz, and 125 kHz proximity simultaneously. Means you can support legacy proximity badge holders alongside modern NFC phone-based credentials without hardware replacement. Real operational flexibility on facilities in transition.
- Wired-Only Control (No Wireless): OSDP and TCP/IP command streams are deterministic—no latency jitter, no interference from Wi-Fi or adjacent wireless locks. On critical-access doors (secure entry, medication room, server room), that guarantee of sub-50ms response time matters. Wireless locks cannot promise that.
- Vandal-Resistant Clutch Design: We've seen these locksets survive repeated forced-manipulation attempts in detention and education settings where other cylindrical locks failed. The clutch protects the internal solenoid actuator from impact damage.
Deployment Considerations:
- Wired solenoid and REX runs must be run from panel to each door—no wireless fallback. On retrofits with existing conduit, this is straightforward; on new construction, budget for 18/2 or 18/4 twisted-pair runs (solenoid command, REX return, optional auxiliary contact). Plan panel consolidation carefully if you're upgrading from standalone mag-locks to distributed cylindrical strikes.
- REX button mounting is separate from the lockset—you source and install an exit button wired back to the panel. On retrofit projects, existing ADA egress buttons (push-to-exit bars) often are compatible, but verify with the integrator. Don't assume a button comes with the strike.
- Cylinder keying (6-pin vs. SFIC 7-pin) must be decided at order time. Cross-compatible master-key campaigns are standard practice, but retrofit facilities mixing old and new locks should commit to one cylinder standard per building zone to avoid keying errors and duplicate keys in the field.
- OSDP command latency over TCP/IP is <100ms on LAN; WAN delays can exceed 500ms depending on network architecture. For high-concurrency environments (visitor reception, employee turnstile), account for queuing if you're attempting to validate every card swipe in real time through a cloud or distant server.
- Fire-rated openings require the failsecure latch to remain engaged when unlocked—the Z7252EQ6PKA's design supports this out-of-the-box. Verify with the fire marshal or AHJ if your facility's fire-rated door schedule mandates the latch remain locked (even during normal operation) or just during power loss. Some codes require manual override key access even when the solenoid is energized.
- Trim and rose finish options (Eclipse ER, Galaxy GR) should be coordinated with existing door hardware aesthetic. The lockset is visible, and mismatched finishes on adjacent doors appear unprofessional in public-facing spaces.
The Z7252EQ6PKA is the right choice for facilities with distributed door-level access control, existing 12/24VDC infrastructure, and a need for deterministic wired lock response with fire-code compliance. It's not suitable for fully wireless deployments or applications requiring battery backup on individual doors. If you're standardizing access control across a multi-building campus with mixed legacy and modern readers, the multi-credential support keeps hardware SKU count low and future-proofs the deployment. Explore the full SDC electrified lockset lineup in the SDC catalog.
