N4DCL Four Digit Mechanical Combination Lock
N4CDL Four Digit Combination Locker Lock
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Features
N4DCL Four Digit Mechanical Combination Locker Lock
The N4DCL is a four-digit mechanical combination lock designed for compatible lockers, cabinets and secure storage doors. It provides convenient keyless user access without batteries, wiring or an electronic management system.
Users operate the lock by entering their chosen four-digit code. An authorised master key can be used to open the lock without changing or resetting the existing user code, helping site managers deal with forgotten combinations and access locked compartments when required.
N4DCL Key Features
- Four-digit mechanical combination access
- Keyless day-to-day operation
- No batteries, wiring or external power required
- User-settable combination
- Master-key override for authorised management access
- Master-key access does not reset the existing user combination
- Suitable for compatible new and retrofit locker installations
- Designed for personal-use locker applications
Combination Lock and Override Operation
| Function | Operation | Benefit |
|---|---|---|
| User access | Four-digit mechanical combination | Users do not need to carry a locker key |
| Combination setting | User-settable code | Allows an allocated user to manage their own access code |
| Management access | Authorised master-key override | Allows the locker to be opened when the code is unavailable |
| Code retention | Override access does not reset the user code | The existing combination remains available after management access |
| Power requirement | None | No batteries or electrical connection are required |
Designed for Personal-Use Lockers
The N4DCL is suitable for lockers allocated to an individual user for a defined period. The user selects and operates their own combination, while authorised staff retain the ability to open the lock using the appropriate master key.
This arrangement can reduce the administration associated with issuing, replacing and collecting individual locker keys. It also provides a controlled method of management access where a user forgets their code or a locked compartment must be inspected.
Typical Applications
- Workplace and staff lockers
- School and university lockers
- Gym and leisure-centre lockers
- Healthcare staff changing areas
- Office storage lockers
- Industrial changing-room lockers
- Compatible cabinets and secure storage doors
Mechanical Lock Benefits
Because the N4DCL operates mechanically, it does not require battery replacement, electrical wiring or software administration. This makes it a practical option for sites seeking straightforward combination access without introducing an electronic locker-locking system.
| Benefit | Practical Advantage |
|---|---|
| Keyless user access | Reduces reliance on individually issued locker keys |
| Mechanical operation | No batteries, charging or electrical connection |
| User-settable code | Allows the assigned user to control their locker combination |
| Master-key override | Provides controlled access for authorised site management |
| Code retained after override | Management access does not automatically alter the user code |
Locker Compatibility and Installation
The N4DCL is not automatically compatible with every locker door. Before ordering, check the existing door preparation, door thickness, handing, fixing arrangement and internal locking mechanism.
When replacing an existing locker lock, provide the locker manufacturer, current lock reference, aperture measurements and clear photographs of the front and rear of the door. Retrofitting may require changes to the door, strike or internal locking arrangement.
Master-Key Management
Master keys should be issued only to authorised personnel and stored securely. Where several N4DCL locks are installed across a site, confirm the required master-key arrangement and the number of management keys before ordering.
Before Ordering
- Confirm that the N4DCL is compatible with the locker door.
- Check the existing aperture and internal locking arrangement.
- Confirm whether a master key is required.
- Specify the number of locks and management keys required.
- Check whether installation or door modification will be necessary.
Related Locker Lock Ranges
Locker Locks Combination Locks Parts & Service
Technical Documentation
Check the product specification before ordering to confirm dimensions, door preparation, installation requirements and master-key operation.
Specification
Please see our technical documentation for this product below N4CDL Four Digit Mechanical Combination Lock Specification
N4CDL Four Digit Mechanical Combination Lock Specification
The N4CDL is a robust four-digit mechanical combination lock designed for compatible metal lockers. Its metal casing provides additional durability, while the mechanical operation removes the need for batteries, wiring or electronic programming.
The lock is designed to fit the standard 16 mm double-D mounting hole used on many UK metal lockers. Compatibility should still be checked before ordering, particularly when replacing a different lock or fitting the N4CDL to an older locker door.
Black and white lock finishes are available, with black normally held in stock. Availability of the white version should be confirmed when ordering.
Key Features
- Four-digit mechanical combination lock
- Robust metal casing
- No batteries or electrical connection required
- User-settable four-digit combination
- Reset button for changing the code while the lock is open
- Override-key access for dealing with a lost combination
- Designed for a standard 16 mm double-D locker mounting hole
- Suitable for selected new and retrofit metal locker installations
- Available in black or white
- Black version normally held in stock
N4CDL Technical Specification
| Specification | Details |
|---|---|
| Product code | N4CDL |
| Lock type | Mechanical combination locker lock |
| Combination | Four digits |
| Construction | Metal casing |
| Power requirement | No batteries or external power required |
| Mounting preparation | Standard 16 mm double-D metal locker mounting hole |
| Code reset | The combination can be changed using the reset button while the lock is open |
| Lost-code access | Override key available separately |
| Available colours | Black and white |
| Stocked colour | Black |
| Typical application | Compatible metal locker doors |
Combination and Override Operation
| Function | How It Works | Important Information |
|---|---|---|
| Normal user access | The user enters the selected four-digit combination | No user key or battery is required |
| Changing the combination | The reset button is used while the lock is open | The current code must normally be known before changing it |
| Lost combination | An authorised override key is used to access or reset the lock | The override key is sold separately |
| Management control | Override keys should be retained by authorised personnel | Store override keys securely and control who can use them |
Override Keys
N4CDL override keys are sold separately and are not included automatically with each lock. Select the required override-key option shown with the product or contact Total Locker Service before ordering.
An override key allows authorised personnel to deal with a forgotten combination. Override keys should be stored securely and issued only to authorised site managers.
Locker Compatibility
The N4CDL is designed for the standard 16 mm double-D mounting hole found on many UK metal lockers. However, locker-door thickness, internal locking arrangements and existing apertures can vary.
When replacing an existing lock, check the locker manufacturer, door preparation and internal locking mechanism before ordering. Clear photographs of the front and rear of the locker door can help confirm compatibility.
Colour Options
| Colour | Availability |
|---|---|
| Black | Normally held in stock |
| White | Available; confirm current lead time before ordering |
Before Ordering
- Confirm that the product code required is N4CDL.
- Check that the locker has a compatible 16 mm double-D mounting hole.
- Confirm the required lock colour.
- Check whether override keys are required.
- Confirm the number of locks and override keys required.
- Check whether the existing locker door requires modification.
Technical Documentation
Review the specification sheet before ordering to confirm fitting, operation and compatibility.
N4CDL Four Digit Combination Lock Specification
Related Locker Lock Ranges
N4CDL Combination Lock FAQs
What type of lock is the N4CDL?
The N4CDL is a four-digit mechanical combination lock designed for compatible metal locker doors.
Does the N4CDL require batteries?
No. The N4CDL is mechanically operated and does not require batteries, wiring or an external power supply.
How many digits are used in the N4CDL combination?
The lock uses a four-digit user combination.
Can the N4CDL combination be changed?
Yes. The combination can be changed using the reset button while the lock is in the open position.
What happens if the combination is forgotten?
An authorised override key can be used to deal with a forgotten combination. Override keys are sold separately and should be stored securely.
Is an override key supplied with every N4CDL lock?
No. N4CDL override keys are sold separately. Select the required override-key option with the product or contact Total Locker Service before ordering.
Will the N4CDL fit a standard metal locker?
The N4CDL is designed for a standard 16 mm double-D metal locker mounting hole. Compatibility should still be checked because locker doors and internal locking arrangements can vary.
Can the N4CDL replace an existing locker lock?
It can be fitted to selected compatible locker doors. Check the mounting hole, door thickness and internal locking arrangement before ordering a replacement.
Which N4CDL colours are available?
The N4CDL is available in black and white. Black locks are normally held in stock, while availability of white locks should be confirmed before ordering.
What is the N4CDL casing made from?
The supplied product information states that the N4CDL has a robust metal casing.
Where can other combination locker locks be compared?
Compare other models on the combination locker locks page or view the complete locker lock range .
Where can the N4CDL specification be downloaded?
Download the N4CDL specification sheet for further product information.
Delivery
Delivery Information
The approximate lead time is 5 Working Days.
Delivery to Mainland UK only, without any restrictions.
Our delivery times are; Monday - Friday 8am to 5pm.
We will deliver using the most economical method, using either our own vehicles or a carrier.
Goods may be palletised and delivered on an articulated vehicle.
The deliveries are kerb side only, you will need to arrange to unload the vehicle.
If there are any delivery restrictions / specific dates / times / dedicated deliveries, or FORS Registered deliveries; please contact the sales department as there may be an additional cost.