Retrofit·Series

SKU-S1

Surface Thumb-Turn Retrofit

Non-invasive motorized smart upgrade preserving original lock cylinders.

  • Keeps existing cylinder and exterior keys intact
  • Clamps directly over the interior thumb-turn
  • Zero door drilling or mortise alteration
  • Installs in 10 minutes or less
Installation
Surface clamp / adhesive adapter
Standard color
Architectural Red-Brown
Ideal for
Rental apartments, Airbnb, quick B2C/B2B deployments
Request SKU-S1 samples
SKU-S1 Surface Thumb-Turn Retrofit
In use on a dark matte door with smartphone unlock
In use on a dark matte door with smartphone unlock
Scale: beside a standard smartphone and cylinder cell
Scale: beside a standard smartphone and cylinder cell
Rotary manual knob and status indicator
Rotary manual knob and status indicator

Technical parameters

Specification & engineering targets

ParameterSpecificationStatus
Product envelope39.8 W × 22.5 D × 90.5 H mmValidated engineering CAD
EnclosureOne-piece CNC / extruded aluminum alloyValidated spec
FaceplateFine-textured polymer, Red-Brown standardOEM customizable
DriveHigh-torque precision motorized gearboxValidated component
Manual overrideKnurled rotary knob (power-free)Mechanical feature
Rated torque≥ 10 kgf·cm*Engineering target
Unlock duration≤ 2.0 s @ rated load*Pending validation
Acoustic noise≤ 45 dBA @ 0.5 m*Engineering target
Battery life≥ 9 months @ 8 cycles/day*Engineering target
Battery capacity≥ 7 Wh (≈ 2000 mAh rechargeable)*Engineering target
Operating range−20 °C to +50 °C*Pending validation
Installation time≤ 10 min on compatible doors*Field study target

* Figures marked as targets are subject to final testing and assembly validation.

Need the other retrofit method?

SKU-S2 · Integrated Euro Cylinder →