Product Overview
A best‑selling 4‑digit mechanical combination lock for 2026. Purely mechanical – unlock by rotating the numeric dial to enter a 4‑digit code (10,000 combinations). Features a master code or master key function ("master combination lock"), allowing administrators to reset or emergency‑open the lock when users forget their codes. The housing is made of zinc alloy or ABS (depending on the specific model) – durable and reliable. Made in China.

Key Features

• 4‑digit code : Offers 10,000 combinations (0000–9999), providing higher security than 3‑digit locks.

• Mechanical digital structure : Purely mechanical operation – no batteries, no electronic components, low failure rate, unaffected by temperature or humidity.

• Master function : Equipped with a master code or master key – administrators can reset user codes or perform emergency unlocking, ideal for centralized management scenarios.

Applicable Scenarios

• School lockers, gym lockers

• Employee changing rooms, factory tool cabinets

• Dormitory storage boxes, public bathhouse lockers

• Low to medium risk storage scenarios requiring centralized management and a certain level of security

Advantages

• Keyless convenience : Users do not need to carry a key – just remember the code to unlock.

• Maintenance‑free : No battery changes, no wiring – ready for long‑term service after installation.

• Easy management : Administrators can reset codes using master privileges, avoiding lock damage due to forgotten user codes.

• Enhanced security : The 4‑digit combination offers far more combinations than 3‑digit locks, providing stronger resistance to brute‑force guessing.

• Made in China : Mature manufacturing processes, high cost‑effectiveness, support for bulk customization.