The Roller Latch Mortise Lock is a roller-type latch lock with a lock body embedded inside the door leaf. It relies on the elastic engagement of the roller and the latch to achieve door closing and positioning, allowing for smooth pushing and pulling to reset without pressing down the handle when opening. Unlike common square or beveled latch locks, this product uses a roller latch as the core closing component, reducing noise and wear caused by friction between the metal bevels. It is suitable for doors that require frequent opening and closing and where a smooth feel is desired. The lock body supports various back spacing specifications from 30mm to 70mm, and center distance options of 72mm and 85mm. Front plate thickness is 3mm, and width is selectable from 20mm to 24mm. The front plate material can be SS201 or SS304, and the surface can be treated with SSS or PSS finishes, meeting the requirements of modern door fittings for dimensional compatibility and aesthetic consistency.

Roller Latch Mortise Lock Parameters:

Roller Latch Mortise Lock Features:

1. Smooth Closing

The Roller Latch Mortise Lock uses a roller latch structure with 8mm diameter rollers, available in stainless steel, brass, or zinc alloy. When the door closes, the rollers contact the latch through rolling friction, reducing the resistance coefficient to 0.05. This is smoother than traditional angled latch sliding friction, resulting in lighter door reset and improved stability and consistent rebound during frequent opening and closing.

2. Versatile Compatibility

Center distances are available in 72mm and 85mm, with back distances covering 30mm, 35mm, 40mm, 45mm, 50mm, 60mm, and 70mm, facilitating compatibility with various door types and handle systems. Front panel widths are available in 20mm, 22mm, and 24mm, with a thickness of 3mm. Mounting hole machining accuracy is controlled within ±0.2mm, reducing assembly misalignment and rework probability.

3. Wear-resistant Front Panel

The front panel material can be selected from SS201 or SS304, with surface treatments supporting SSS and PSS. The roughness of the brushed surface is controlled within Ra0.8. A 3mm thick front panel improves bending rigidity; after screwing, the front panel deformation is less than 0.3mm, maintaining consistent gaps around the door edge and ensuring a smooth and stable appearance even after long-term use.

4. Robust Lock Body

The lock body shell is made of electrolytic steel or steel structure with a shell thickness of 1.0mm. Key stress points utilize reinforced folding edges. The clearance between the latch and internal transmission components is controlled within 0.15mm, reducing the probability of looseness and abnormal noise. The entire lock body can withstand a lateral impact force of no less than 1000N, maintaining reliable door closure.

5. Convenient Supply

The Roller Latch Mortise Lock supports both round and square head front panels to meet different door edge design requirements. Minimum order quantity is 300 pieces. Packaging is individual white boxes or color boxes packed into standard export cartons for easy warehousing and barcode management. Standard lead time is 30 to 35 days. Sample confirmation is supported; samples can be used for door assembly testing and hole position verification.

Roller Latch Mortise Lock Application:

1. Interior Wooden Doors

Interior wooden doors emphasize quiet operation and smooth opening and closing. Roller-type closing mechanisms reduce scraping noise between the door leaf and the latch. After installation, the door can be easily closed with a gentle push, avoiding fatigue of the handle mechanism from repeated handle presses. This helps maintain consistent door opening and closing and ensures ease of use.

2. Metal Doors

Metal doors are relatively heavy. Conventional latches experience high frictional resistance when closing, easily producing impact noise. Roller-type closing mechanisms reduce the impact upon closing, decreasing peak stress on the door frame and latch, improving door closure stability. This is suitable for metal structure doors that require uniform door gaps and edge strength.

3. Steel Partition Doors

Steel partition doors are often used in interior spaces requiring high-frequency passage and efficient opening and closing. Roller-type positioning mechanisms allow for quick closing without handle operation, reducing pauses in passage and minimizing wear on the handle mechanism from frequent presses, thus improving the overall durability of the door system.

4. Exterior Door Systems

Exterior doors typically require higher structural strength and assembly consistency. Multiple back spacing and front panel specifications facilitate matching with different door leaf thicknesses and frame structures. After confirming the hole positions through sampling, batch supply can be arranged uniformly, ensuring standardized assembly and stable closing positioning across multiple door models for door manufacturers.

5. Custom Door Manufacturer Support

Custom door manufacturers face diverse hole positions and handle system requirements in different projects. Two center distance options, 72mm and 85mm, cover common hardware systems. Supported samples can be used for on-site trial assembly and verification. Bulk orders can be placed only after confirming the back spacing and front panel dimensions, reducing project matching risks and improving delivery consistency.

Roller Latch Mortise Lock FAQs:

Q: How to choose between 72mm and 85mm center distances for Roller Latch Mortise Locks?

A: The choice should be based on the hole spacing standards of the door handle system. 72mm is commonly used for interior door handles, while 85mm is used for some engineering doors or specific lock systems. It is recommended to use the existing door panel opening template as a reference, first comparing the center distance and back distance, then confirming the front panel width to avoid misalignment of the handle holes after lock installation.

Q: Will a difference in back distance between 30mm and 70mm affect installation?

A: The back distance determines the distance from the lock body center to the door edge, directly affecting the handle pivot position and the door panel opening position. Changing the back distance will cause changes in the opening template; therefore, the back distance specification should be consistent for the same project. If the door manufacturer already has a fixed template, it is recommended to select the corresponding back distance according to the template, and conduct a sample trial installation for confirmation before bulk purchasing.

Q: What are the differences between stainless steel, brass, and zinc alloy for the roller material?

A: Stainless steel rollers offer high wear resistance, suitable for high-frequency opening and closing doors; brass rollers provide a smoother feel and smoother closing; zinc alloy rollers offer good forming consistency, suitable for solutions prioritizing cost and stable batch production. The choice should be matched to the door's opening and closing frequency and desired feel.

Q: Is SS201 or SS304 more suitable for the front panel?

A: SS304 has stronger corrosion resistance, suitable for projects with large humidity fluctuations or higher requirements for appearance stability; SS201 meets the needs in normal indoor environments, suitable for budget-sensitive solutions that still require a metallic finish. It is recommended to confirm based on the door's environment and surface treatment plan.

Q: Can we make a sample for confirmation before mass production?

A: Sample confirmation is supported. Samples can be used to verify center distance, back distance, front panel dimensions, and the matching of the door manufacturer's opening template. After confirmation, mass production will begin with a minimum order of 300 pieces, with a standard lead time of 30 to 35 days. This reduces the risk of installation rework and improves the consistency and assembly efficiency of batch deliveries.