Sep 01, 2026
The Richelock IU51B and Richelock IU53 are both designed for users seeking convenient keyless entry with fingerprint and keypad authentication.
However, they serve different security needs and door applications. The Richelock IU51B focuses on fast biometric access, high user capacity, and simple door-knob replacement, while the Richelock IU53 is built for high-security applications requiring authentication from both sides, such as gates and pool enclosures.
Richelock IU51B vs Richelock IU53 smart lock specs
| Feature | Richelock IU51B | Richelock IU53 |
Lock type | Biometric keypad door knob | Double-sided biometric & keypad lock |
Fingerprint capacity | Up to 100 | Up to 100 |
Passcode capacity | Up to 50 | Up to 50 per side |
Wi-Fi/app control | No | No |
Emergency power | USB-C | USB-C on both sides |
Auto-lock | Yes | Yes, 2 seconds to 12 hours |
Weather resistance | Weather-resistant zinc alloy | IP65 |
| Best deals for today | Richelock IU51B | Richelock IU53 |
Richelock IU51B Fingerprint Door Knob
The Richelock IU51B is the better choice for users who want fast biometric access in a compact door-knob design. Its approximately 0.1-second fingerprint recognition provides extremely quick entry, while PIN codes and mechanical backup keys give users alternative access methods.
Pros
- Approx. 0.1-second fingerprint recognition
- Supports up to 100 fingerprints
- Stores up to 50 PIN codes
- Efficient 2-AAA battery design
- Emergency USB-C power port
Cons
- No Wi-Fi connectivity
- No smartphone app control
- No smart-home integration
Richelock IU53 Double-Sided Fingerprint & Keypad Door Lock
The Richelock IU53 is the better option for users who need controlled access from both sides of an entrance. Unlike the IU51B, it places biometric and keypad authentication on both sides, making it particularly useful for perimeter gates, pool enclosures, courtyard fences, and other locations where unrestricted exit access is undesirable.
Pros
- Dual-sided fingerprint and keypad authentication
- Up to 100 fingerprints per side
- Up to 50 passcodes per side
- Self-learning fingerprint technology
Cons
- No Wi-Fi or smartphone app control
- No smart-home integration
- Requires authentication when exiting
Which Richelock fingerprint door lock should you buy?
The Richelock IU51B is the better choice if you want fast biometric entry for a standard residential or office door. On the other hand, the Richelock IU53 is better for high-security applications requiring two-sided authentication.
