Adjustable Positioning with Firmer Screw Fastening
The M&K Metal Knockout Box with Adjustable Lug and Heavy-Duty Fixing Screw combines two separate mounting components: one adjustable lug for position adjustment and one more substantial fixing screw for firmer fastening.
This model builds on the secure-fixing configuration of the heavy-duty screw box. The additional adjustable lug provides a movable mounting point that can be positioned during fitting, helping align the switch or socket before final tightening.
Pre-punched knockouts provide prepared cable and conduit entry points, while established single-gang and multi-gang box formats are available for different installation requirements.
Key Features
Adjustable Lug
The movable mounting lug allows its fixing position to be adjusted during installation, helping achieve better switch or socket alignment.
Heavy-Duty Fixing Screw
One more substantial fixing screw is supplied as standard, providing firmer engagement than a conventional small screw.
Positioning and Stability
The adjustable lug helps position the installed accessory, while the robust screw provides a firmer final fastening point.
Pre-Punched Knockouts
Knockouts on the selected box panels provide prepared entry points for cables and conduits according to the required layout.
Two Components with Different Functions
| Component | Function | Installation Benefit |
|---|---|---|
| Adjustable Lug | Provides a movable mounting position | Helps align the switch or socket before tightening |
| Heavy-Duty Fixing Screw | Provides the main fastening point | Creates firmer engagement and a more stable final fixing |
How the Adjustable Lug Works
A fixed mounting position may not always align perfectly with the switch, socket or wall opening. The adjustable lug provides limited positional movement during fitting, allowing the mounting point to be aligned before the installation is fully tightened.
Once the required position has been established, the mounting arrangement can be secured for the final installation. The heavy-duty fixing screw provides the firmer fastening feature, while the adjustable lug provides the positioning flexibility.
Comparison with the Heavy-Duty Screw Model
| Feature | Heavy-Duty Screw Model | Adjustable-Lug Model |
|---|---|---|
| Heavy-Duty Fixing Screw | Included | Included |
| Adjustable Lug | Not included as the defining feature | One adjustable lug included |
| Position Adjustment | Standard mounting position | Mounting position can be adjusted during fitting |
| Main Benefit | Firmer screw fastening | Firmer fastening with adjustable positioning |
Product Specifications
| Item | Available Specification |
|---|---|
| Product Name | Metal Knockout Box with Adjustable Lug and Heavy-Duty Fixing Screw |
| Related Product Terms | Adjustable Lug Metal Back Box / Adjustable Mounting Metal Box |
| Standard Hardware | One adjustable lug and one heavy-duty fixing screw |
| Lug Type | Movable and position-adjustable mounting lug |
| Lug Function | Helps adjust and align the accessory mounting position |
| Screw Type | Heavy-duty fixing screw supplied as standard |
| Screw Specification | Diameter, thread, length, head style and finish confirmed by model |
| Box Formats | Existing single-gang and multi-gang configurations |
| Dimensions and Depth | Selected by existing model or confirmed specification |
| Sheet Thickness | Selected according to the required box configuration |
| Knockout Layout | Knockout diameter, quantity and position selected by model or drawing |
| Typical Use | Switch, socket, cable and conduit installation points |
When to Choose This Model
- The mounting position may require adjustment during fitting
- A conventional fixed mounting point does not provide enough alignment flexibility
- A more substantial fixing screw is preferred over an ordinary small screw
- Both positioning flexibility and firm final fastening are required
- Pre-punched cable or conduit entries are required
Information Required for Model Selection
Please confirm the following information:
- Single-gang or multi-gang configuration
- External box dimensions and required depth
- Required sheet thickness
- Adjustable-lug position and required adjustment range
- Fixing screw diameter, thread and length if specified
- Knockout diameter, quantity and cable entry positions
- Required material, surface finish and packaging
Existing Models and Custom Specifications
M&K already offers established adjustable-lug metal knockout box configurations covering common box sizes, depths, knockout layouts and fixing arrangements. We first compare your requirements with these existing models and recommend the closest suitable configuration.
If an existing model does not match the required installation, the box dimensions, sheet thickness, knockout arrangement, adjustable-lug position, screw specification, finish, branding and packaging can be confirmed against a drawing or sample.
Choose the Appropriate Box Structure
Metal Knockout Box with Heavy-Duty Fixing Screw
For installations that need firmer screw fastening without an additional adjustable lug.
Standard Metal Knockout Box
For regular installations using a standard fixed mounting configuration.
35mm Metal Knockout Box with Center Support Bar
For wider multi-gang boxes that require additional support across the center.
46mm 1.0mm Metal Knockout Box with Center Support Bar
For installations that require more wiring space, a thicker body and center reinforcement.
Frequently Asked Questions
What is the purpose of the adjustable lug?
It provides a movable mounting position that can be adjusted during fitting, helping align the switch or socket before final tightening.
Does the adjustable lug replace the fixing screw?
No. The two parts have different functions. The lug provides position adjustment, while the heavy-duty screw provides firmer fastening.
What is the difference between this model and the heavy-duty screw model?
Both models include a more substantial fixing screw. This model adds one adjustable lug for additional positioning flexibility during installation.
How many adjustable lugs and fixing screws are supplied?
The standard configuration shown on this page includes one adjustable lug and one heavy-duty fixing screw.
Can the lug position and box layout be customized?
We first recommend an existing M&K configuration. If it does not match the installation requirement, the lug position, box dimensions and knockout layout can be confirmed from a drawing or sample.
Confirm Your Adjustable-Lug Box
Send us the required gang format, box dimensions, adjustable-lug position, fixing screw specification and knockout layout. We will first match your requirements with an established M&K model and confirm any necessary adjustments.
