SDC Z7250GQ Electronic Cylinder Lockset with REX
The SDC Z7250GQ is a Grade 1 solenoid-controlled cylindrical lockset engineered for enterprise access control across commercial, industrial, and institutional facilities. This model combines electronic locking with integrated request-to-exit (REX) functionality, eliminating the operational complexity and cost of layering separate exit hardware on top of mechanical locks. Field-selectable 12/24 VDC operation allows a single SKU to integrate into diverse power infrastructures — set voltage at installation to match your facility's supply. The lockset retrofits into existing cylindrical lock preparations on standard commercial doors, reducing capex and installation timeline on mid-scale deployments.
Key Features
- OSDP and TCP/IP Connectivity: Native OSDP support integrates with enterprise access control platforms (HID, Salto, Farpointe, Genetec) without proprietary gateways; TCP/IP fallback enables hybrid wired and networked deployments.
- Multi-Credential Support: DESFire, MIFARE, NFC 13.56MHz, and 125kHz proximity — accepts cards, fobs, and mobile NFC tokens. Single reader eliminates the need for dual-technology hardware on retrofit projects.
- Capacity for Large Deployments: Manages 250,000 user records across 63-door systems — typical enterprise footprint without requiring distributed controllers or secondary database servers.
- Integrated Request-to-Exit: REX circuitry built into the lock body; no external motion sensors or additional wiring for egress compliance on interior-facing doors.
- 24VDC Field-Selectable Supply: Operates on 12 or 24VDC (configured at installation). No external voltage regulator required; internal power conditioning reduces BOM and simplifies panel wiring.
- Fire Door Certified: Solenoid-controlled latch remains mechanically latched even when de-energized, preserving fire-rated door closure and label integrity during power loss.
- Vandal-Resistant Clutch: Proprietary SDC clutch design resists forced manipulation and protects against casual bypass attempts on high-traffic or high-risk doors.
- Standard Cylindrical Preparation: Fits Eclipse Rose (ER) and Galaxy Rose (GR) trim; retrofits most mechanical cylindrical locksets without door frame modification. Optional I-Core prep supports SFIC 7-pin cylinders for master-key strategies.
The Z7250GQ bridges the gap between full-scale electronic door control and retrofit constraints. On projects where replacing door frames or installing full electric strikes is cost-prohibitive, this lockset delivers credential-based access, audit logging, and centralized locking policy without demolition-level labor. Latch status (LS) monitoring is standard, feeding door position and lock state back to the access control panel — essential for alarm verification and post-incident investigation.
Function selection at purchase determines failsafe versus failsecure behavior. Function 50 (Locked Outside Only, Failsafe) de-energizes to unlock on power loss — appropriate for egress-critical interior doors and evacuation routes. Function 52 (Locked Outside Only, Failsecure) remains locked until power is restored — suited for high-security perimeters and areas where controlled egress is acceptable under emergency protocol. Confirm your life-safety code and security posture before specifying function; once installed, field conversion requires manual override training and operational procedure change.
Finish and keying options span six standard color choices (626 Dull Chrome through 613 Dark Oil Rubbed Bronze) and support both keyed-alike and keyed-different cylinder sets. Standard 6-pin cylinders ship with each lockset; master-key strategies and high-security IC cylinders are available through the SDC factory or authorized distributors. On multi-door rollouts, verify trim geometry and finish match to existing door hardware before order placement — mixing 625 Bright Chrome with 612 Dull Bronze across the same floor creates maintenance friction and aesthetic inconsistency.
The Z7250GQ carries a lifetime manufacturer warranty on the solenoid and latch assembly, excluding normal wear and intentional damage. Integration with Genetec, HID, Farpointe, and Salto platforms is well-established; ONVIF-adjacent TCP/IP support ensures compatibility across heterogeneous access control ecosystems. For facilities migrating from mechanical locks to networked access without full-scale hardware replacement, the Z7250GQ reduces risk and shortens ROI on credential infrastructure investment.
Jerry TildsenPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the SDC Z7250GQ on dozens of retrofit and new-construction projects where electronic access control is required but full electric strike replacement is either cost-prohibitive or structurally infeasible. The real strength of this lockset is that it solves a specific integration problem: it's a drop-in replacement for mechanical cylindrical locks that brings credential management and REX capability without touching the door frame, panic hardware, or frame reinforcement. On a recent 40-door office retrofit where the building owner wanted to migrate from key management to badge-based entry, we installed Z7250GQs in place of mechanical locks over a single weekend — no frame work, no down-time beyond lock exchange. The OSDP connectivity kept integration clean: direct wiring from each lock to the access control panel, no proprietary gateways, and full audit logging from day one.
Technical Highlights:
- OSDP Native Protocol: Eliminates proprietary reader/controller stacks. We've paired this with Genetec and HID platforms without translation layers — native OSDP means credential data travels encrypted from the panel to the lock, reducing audit risk and simplifying compliance documentation.
- Multi-Credential Flexibility: The same lock reads DESFire, MIFARE, NFC, and 125kHz prox in one hardware footprint. On projects with mixed credential inventories (legacy prox, new DESFire migration in progress), this avoids the cost and confusion of deploying dual-reader solutions. We've seen this cut credential-upgrade labor by 30-40% over two-reader strategies.
- Integrated REX Eliminates Motion Sensors: Request-to-exit is built into the lock body — no separate motion detector, no hidden wiring conduit, no false-open alarms from shadow or thermal drift. For interior egress doors on multi-tenant facilities, this is a cleaner, more reliable approach than sensor-based REX.
- Failsafe vs. Failsecure Trade-off: Function selection must happen at purchase — there's no field-selectable jumper. We always confirm code compliance and emergency egress protocol before order placement. Failsafe (Function 50) is safest for evacuation routes; Failsecure (Function 52) tightens security but requires operational approval from life-safety. Know your jurisdiction's stance on this before you're mid-installation.
- Voltage Flexibility — but Verify Panel Supply: Field-selectable 12/24 VDC is useful on heterogeneous campuses, but don't assume your control panel's power output is adequate for 63-door capacity. We run a quick load calculation: at 12VDC, solenoid draw is higher, and voltage drop over long cable runs becomes real. We typically see 24VDC spec'd on larger systems for headroom and efficiency.
Deployment Considerations:
- Trim and finish must be verified against existing door hardware before order. The Z7250GQ ships with ER or GR rose — confirm your door's lock preparation type. Mixing cylinder sizes or finishes across the same corridor creates maintenance friction and user confusion on manual override scenarios.
- Fire-rated door application requires Function 50 (Failsafe) in most jurisdictions — the lock's mechanical latch design preserves door closure label even on power loss, but your AHJ (Authority Having Jurisdiction) call is mandatory before installation on fire-egress routes.
- OSDP wiring is low-voltage; run it in separate conduit from power and data networks to avoid EMI noise. We've seen credential read failures traced to inadequate cable shielding on runs longer than 150 feet. Budget for proper conduit and grounding discipline.
- Master key and I-Core prep options are available but must be specified at order time — retrofitting from standard 6-pin to SFIC requires factory re-work or hardware swap. Plan keying strategy upfront.
- Latch status monitoring is factory-enabled; confirm your ACP supports LS input before wiring. On older control panels, LS feedback can require firmware updates or separate monitoring modules.
The Z7250GQ is the right choice for integrators who need credential control and REX on existing mechanical lock footprints without full-scale door hardware replacement. It's particularly valuable on phased deployments and retrofits where capex and installation time are constraints. For new construction or full-replacement projects, consider electric strikes for broader functionality; for retrofits and mid-scale access upgrades, this lockset pays for itself in reduced labor and engineering complexity. Learn more about SDC's full electronic lock portfolio at the SDC catalog.
