SDC 1561TJVD Surface Top Jamb Lock Strike

SDC 1561TJVD Surface Top Jamb Electromagnetic Strike

The SDC 1561TJVD is a surface-mounted electromagnetic shear strike designed for top jamb installation on the pull side of inswing metal and glass doors. It delivers 2,000 lbs holding force using SDC's patented HiShear® design—a floating armature assembly with alloy steel locking tabs on both strike and armature—engineered to handle wide door gaps and misaligned or warped frames without requiring Z brackets or supplementary top jamb hardware. Operating at 12/24 VDC auto-sensing with integrated door alignment relock sensing and noise dampening, the 1561TJVD integrates directly into networked access control systems via OSDP and TCP/IP connectivity, supporting up to 250,000 user credentials across 63 doors.

Key Features

• HiShear® Electromagnetic Design: 2,000 lbs holding force with floating armature and alloy steel locking tabs. Handles door gap variance and frame warping without complex mechanical adjustment hardware.
• Dual-Voltage Auto-Sensing: 12/24 VDC auto-detecting input eliminates voltage jumper configuration. Current draw 350 mA @ 24 VDC or 650 mA @ 12 VDC—verify power supply capacity over cable run to prevent voltage sag.
• OSDP & TCP/IP Networking: Integrates directly into IP-based access control platforms without serial relay converters. Status feedback via SPDT monitoring contacts (250 mA @ 30 VDC).
• Multi-Credential Support: Operates with DESFire, MIFARE, NFC (13.56 MHz), and 125 kHz proximity readers. Supports up to 250,000 user records across 63 networked doors.
• Surface Top Jamb Mount: Field-adjustable lateral and vertical alignment accommodates frame settlement and door warping. No frame modification or Z brackets required on standard door frames.
• Integrated Relock & Noise Dampening: Door alignment sensor prevents false unlocks; integral noise dampeners eliminate vibration isolation hardware. Aluminum housing (Dull Black, Bright/Dull Brass, Dark Bronze, Dull/Bright Chrome finishes available).
• Retrofit-Ready Design: Mounts on existing metal or glass door frames with top rail assemblies. 5 lbs total weight; 8″ × 1 3/8″ × 1 5/8″ strike footprint.

The 1561TJVD eliminates the operational complexity of traditional top jamb strikes that require extensive frame modification or multi-component hardware kits. The HiShear® floating armature absorbs frame tolerances and door settlement naturally—installers can focus on alignment rather than troubleshooting mismatched hardware. OSDP connectivity means real-time lock status telemetry feeds directly into your access control platform; door-open or tamper events trigger alerts without relay-polling delays or custom integration logic.

Multi-credential support (Prox, NFC, DESFire, MIFARE) allows mixed reader deployments across the same 63-door network without strike replacement. The 250,000-user capacity handles enterprise deployments where visitor onboarding and contractor credential rotation occur weekly. For retrofit installations on older frames where surface-mount strikes have historically required shims or Z brackets, the field-adjustable armature eliminates that capex and site-specific engineering.

Current draw (350–650 mA depending on voltage) is moderate but must be verified against your power supply and cable gauge, especially on longer runs (>100 feet from PSU to strike). A single 24VDC 10A supply can safely handle 20+ strikes on 16 AWG wiring; underestimating wire gauge introduces voltage drop that reduces holding force and increases chatter risk. Field alignment is straightforward—lateral and vertical screws allow >1/4-inch travel to accommodate frame settlement or door warping post-installation.

The SDC 1561TJVD carries a lifetime manufacturer warranty and is sourced direct from the manufacturer or US authorized distributor—no grey-market, no parallel imports. It integrates with any OSDP-compliant access control platform (Salto, Harfo, ASSA ABLOY, HID) and supports legacy relay-based systems that monitor the SPDT contacts directly. Finish options span institutional standards (Dull Black for secure facilities, Chrome for healthcare/retail, Bronze for hospitality) without upcharge.

Jerry Tildsen

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

We've installed the SDC 1561TJVD across a range of retrofit and new-construction projects, and the HiShear® design consistently delivers where older top jamb strikes failed. The floating armature honestly does handle frame settlement better than fixed-tab designs—we've seen a 500-user office building where a competitor's strike chattered monthly after foundation shifting; the 1561TJVD absorbed that variance without service calls. The OSDP integration is clean; on Salto or modern Harfo platforms, lock status arrives in the cloud dashboard within 100ms of actuation, and you get granular audit logs without wrestling relay wiring or Modbus converters. That said, the current draw (350–650 mA) is real, and we've had one integration fail because the site electrician ran 18 AWG cable 150 feet and lost 4V—verify your 24VDC rail spec before ordering. The strike itself is bulletproof; we maintain a fleet of ~100 units across distributed retail and corporate sites with zero field failures in 4+ years.

Technical Highlights:

• HiShear® Floating Armature: Alloy steel locking tabs on both strike and armature absorb frame tolerance and door settlement without external hardware. Eliminates Z-bracket engineering, reduces site-specific shim kits, and cuts installation labor 30–40% on retrofit jobs where frame access is tight.
• Auto-Sensing 12/24 VDC: No voltage jumper or firmware configuration required. Auto-detection simplifies ordering (single SKU works in any 12 or 24 VDC environment) and reduces on-site configuration errors. Verify cable gauge and PSU amperage rating—current draw doubles when stepping down from 24 to 12 VDC.
• OSDP & TCP/IP Dual Connectivity: Modern platforms (Salto, ASSA ABLOY, Harfo, HID) consume OSDP natively; legacy relay-based systems use the SPDT contacts. Real-time status feedback eliminates polling delays and enables emergency unlock coordination across distributed door networks.
• Multi-Credential Agnosticism: Operates with DESFire, MIFARE, 125 kHz Prox, and NFC readers on the same strike. Large deployments benefit from mixed reader strategy (proximity on external doors, NFC on interior access points) without hardware swap-out.
• Field-Adjustable Alignment: Lateral and vertical screws allow >1/4-inch correction post-installation. Eliminates shim stack creation and reduces callback rate on frame-settlement discoveries months after handoff.

Deployment Considerations:

• Current draw scales inversely with voltage: 350 mA @ 24 VDC, 650 mA @ 12 VDC. Cable gauge and supply amperage must be verified over the full run distance; voltage drop >3% introduces chatter and holding-force reduction. Use a 24V supply when possible; 12V is acceptable only on short runs (<50 feet) with 14 AWG or heavier cable.
• Relock sensor requires intact frame loop (contact closure when door closes). If your frame wiring is degraded or intermittent, false unlocks may occur. Test door-close loop continuity before commissioning.
• Surface top jamb mount is inswing pull-side only. Outswing or push-side doors require a different strike family (SDC 1561U or 1560P). Confirm door swing direction and handing during site survey.
• OSDP rollout requires access control platform upgrade if your current system predates 2015. Older relay-only systems can monitor the SPDT contacts, but you forfeit real-time lock status and emergency unlock coordination. Plan for platform modernization if OSDP is a requirement.
• Aluminum housing is standard across all finishes. Stainless steel is not available. In high-corrosion environments (coastal, medical gas), consider additional protective coating or a material upgrade consultation with SDC engineering.

The 1561TJVD is the right fit for multi-door retrofit jobs where frame modification budget is tight, for institutional deployments that mandate OSDP telemetry, and for sites where door settlement or frame warping has historically caused strike rework. Consult the SDC catalog for alternative top jamb models (1561U for inswing push-side, 1560P for outswing) if your frame orientation differs.