Key Features
Heavy-Duty Fixing Screw Included
One more substantial fixing screw is supplied with the box as standard, rather than relying on a conventional small screw.
Firmer Fastening
The robust screw provides firmer engagement at the fixing point, helping create a steadier and more reliable installed connection.
Pre-Punched Knockouts
Knockouts on the selected box panels provide prepared entry points for cables and conduits according to the required layout.
Multiple Box Configurations
Existing single-gang and multi-gang models are available with different dimensions, depths, thicknesses and knockout arrangements.
Why the Supplied Screw Matters
A fixing screw is a small component, but it directly affects how firmly the fixing point can be tightened. This model is supplied with a heavier and more substantial screw, giving the installer a firmer fastening component from the start.
The main difference between this model and a standard metal knockout box is therefore the supplied fixing screw. It should not be confused with an adjustable screw or an adjustable-lug structure. If positional adjustment is required, an adjustable-lug model should be selected instead.
Product Specifications
| Item | Available Specification |
|---|---|
| Product Name | Metal Knockout Box with Heavy-Duty Fixing Screw |
| Related Product Terms | Metal Back Box with Fixing Screw / Metal Switch and Socket Box |
| Defining Feature | One heavy-duty fixing screw supplied as standard |
| Fixing Benefit | Firmer fastening than a conventional small screw |
| Screw Specification | Diameter, thread, length, head style and finish confirmed by model |
| Box Format | Existing single-gang and multi-gang configurations |
| Dimensions and Depth | Selected from an existing model or confirmed by drawing |
| Sheet Thickness | Multiple options available according to the selected box |
| Knockout Layout | Knockout diameter, quantity and position selected by model or drawing |
| Material and Finish | Metal construction; material grade and surface finish confirmed with the selected specification |
| Typical Use | Switch, socket, cable and conduit installation points |
Information Required for Model Selection
To match the correct metal knockout box, please confirm the following details:
- Single-gang or multi-gang configuration
- External box dimensions and required depth
- Required sheet thickness
- Knockout diameter, quantity and entry positions
- Fixing screw diameter, thread, length and head style if specified
- Required material, surface finish and packaging
Existing Models and Custom Specifications
M&K already offers multiple established metal knockout box configurations covering common gang formats, depths, sheet thicknesses, knockout layouts and fixing arrangements. We first compare your requirements with these existing models and recommend the closest match.
If an existing model does not meet the required specification, dimensions, knockout arrangement, screw details, finish, branding and packaging can be confirmed against your drawing or sample.
Choose the Appropriate Box Structure
Standard Metal Knockout Box
For regular installations where a standard fixing configuration is sufficient.
Metal Knockout Box with Connecting Rod
For installations that require connected boxes and more consistent alignment.
Deep Heavy-Gauge Metal Knockout Box
For requirements involving greater internal depth and a thicker box body.
Metal Knockout Box with Adjustable Lug
For installations where the fixing position needs to be adjusted during fitting.
Frequently Asked Questions
What is the difference between this model and a standard metal knockout box?
This model includes one heavy-duty fixing screw as standard. The more substantial screw provides firmer fastening than a conventional small screw, while other box specifications are selected separately.
Is this an adjustable-screw box?
No. The supplied screw is the main fixing component and should not be described as an adjustable-lug mechanism. Choose an adjustable-lug model when positional adjustment is required.
Does the heavy-duty screw mean the box body is also thicker?
Not necessarily. The supplied screw and the sheet thickness are separate specifications. Box thickness should be confirmed according to the selected model.
Can the screw and knockout specifications be customized?
We first recommend an existing M&K configuration. If it does not match the application, the screw specification, box dimensions, sheet thickness and knockout arrangement can be confirmed from a drawing or sample.
Confirm the Required Box Configuration
Send us the required gang format, box dimensions, depth, sheet thickness, knockout layout and screw specification. We will first match your requirements with an established M&K model and confirm any necessary adjustments.
