STI STI-8171 Mounting Backplate for 8100/8200 Series
Overview
The STI-8171 is a mounting backplate engineered to support STI 8100 and 8200 series electromechanical strikes in door-mounted access control installations. This accessory solves the mechanical anchoring problem: it provides a fixed, load-bearing surface for strike assemblies on hollow-core, metal, or composite door frames where direct screw-down mounting is unreliable or creates installation misalignment. Integrators deploying multi-door access control systems use the STI-8171 to ensure repeatable, frame-level strike positioning across dozens of doorways.
Compatibility
The STI-8171 backplate is designed for integration with STI 8100 and 8200 series strike hardware. It operates on 9VDC power, aligning with standard access control power specifications and existing transformer-based 12VDC systems running step-down regulation. Confirm your strike model number matches the 8100 or 8200 family before ordering — other STI series strikes require different backplate variants.
Installation Notes
Install the backplate to the door frame using the four fixing holes drilled on 7mm centers (per STI installation data). Use a 7mm masonry drill bit for masonry or concrete frames; for metal frames, a standard metal drill and appropriate anchors are needed. Position the backplate centrally behind the strike before securing. Ensure 9VDC power is rated for your strike's solenoid draw — most 8100/8200 strikes pull under 1A, well within standard 12VDC/2A access control power supplies. Cable routing depends on your frame material and wiring scheme — use appropriate cable gaskets to prevent water ingress on exterior doors.
