Mechanical Mortise Lock

This is a simple and reliable mechanical mortise lock with one latch bolt and one deadbolt. The latch bolt keeps the door closed when pushed shut, while the deadbolt secures the door when the key is turned. This design has been used for over 100 years because of its reliability.

The spring return force is 6–10N. This value is based on long-term field data collected from over 50,000 customer cases over 10 years. Below 6N, the latch may not fully extend. Above 10N, the door becomes difficult to close, especially for elderly users and children. Therefore, 6–10N is the optimal range.

We tested spring durability for 200,000 cycles, with less than 8% force degradation. The latch continues to engage reliably, and the deadbolt still operates smoothly.

125×22mm for 60mm backset
145×22mm for 70mm backset

These two sizes cover approximately 90% of interior wooden doors in China. The lock case thickness is 22mm, which is the industry standard. The case is made of 1.2mm cold-rolled steel, and the bolts are made of 304 stainless steel. The surface is zinc plated and passes a 48-hour salt spray test.

The key repeat rate within the same batch is ≤0.01%. This means only one in 10,000 locks may share a key. Each batch uses a unique coding system with a randomized pin configuration. All key codes are recorded. For large orders (e.g., 10,000 units), a full key code table is provided for tracking.

Incoming material inspection
In-line production inspection
100% final testing before packing

Each lock is tested on automated equipment, including latch spring force, deadbolt travel, and key insertion/removal performance.

Third-party inspections by SGS or BV are accepted. If a batch fails inspection, it is fully reworked.

This mechanical mortise lock is suitable for interior wooden doors, bedrooms, offices, apartments, and residential projects. MOQ is 2,000 sets. Standard sizes can be shipped within 7 days, with 50,000 units in stock.