Join metal parts, with a nut or in a tapped hole, so they can be taken apart.

Dome nut white zinc-plated Class 8 Unifix
Also known as: acorn nut, cap nut
Key features
- Height8, 10, 12, 15, 18, 22, 25, 28, 32, 34, 39, 42
- DiameterM4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24
- DriveCH7, CH8, CH10, CH13, CH17, CH19, CH22, CH24, CH27, CH30, CH32, CH36
What it is
The Unifix Class 8 white zinc-plated tall acorn nut (code 0356-4-01 and variants) is the ideal solution for secure fixing on metal structures where space is limited or a protective finish is required. Designed for professionals in building, metal fabrication and industrial maintenance, it ensures strength and durability in environments exposed to damp or corrosive agents.
The dome nut, also known as a cap nut, is a nut closed at one end that covers and protects the threaded tip of the screw or rod and finishes off the fixing.
What it is for
Used for assembling steel structures and for mechanical fixing of structures and components to walls, ceilings and floors.
How to use it
Screw it onto the screw or stud of the same thread, after the washer, and tighten with a spanner or socket. The threaded part must not touch the bottom of the cap: it is the nut that clamps the part. Use it where the protruding end is dangerous or unsightly.
Where it is used
- Mechanical engineering industry
- Mechanical workshops
Technical data
- Height: 8, 10, 12, 15, 18, 22, 25, 28, 32, 34, 39, 42
- Diameter: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24
- Drive: CH7, CH8, CH10, CH13, CH17, CH19, CH22, CH24, CH27, CH30, CH32, CH36
Who it is for
Designed for metal fabricators and industrial maintenance technicians.
Related products
- Galvanised spacer nut, white, Unifix
- Dome nut white zinc-plated Class 8 M30 Unifix
- Threaded rod, steel, class 8.8, Unifix — from the category Threaded Rods
- Flat washer, galvanised, white, Unifix — from the category Flat Washers
- White zinc-plated screw class 4.8 Unifix — from the category Bolts and Metric Screws
- Browse the whole category: Hex Nuts
Before you order
In your request, please state the diameter and the quantities required, so we can give you the right quotation first time.
For prices and availability, request a quote from AMES Srl: we will reply with our quotation, delivery times and, where needed, an equivalent technical alternative.
Specifications 3
| Height | 8, 10, 12, 15, 18, 22, 25, 28, 32, 34, 39, 42 |
|---|---|
| Diameter | M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24 |
| Drive | CH7, CH8, CH10, CH13, CH17, CH19, CH22, CH24, CH27, CH30, CH32, CH36 |
Compare with similar models
Technical data declared by the manufacturers. An empty cell means the figure is not declared.
| Feature |
This model
Dome nut white zinc-plated Class 8 Unifix
|
Tall dome nut, raw brass, Unifix
|
Dome nut stainless steel A2 AISI 304 Cl.70 Unifix
|
Dome nut white zinc-plated Class 8 M30 Unifix
|
|---|---|---|---|---|
| Brand | Unifix | Unifix | Unifix | Unifix |
| Height | 8, 10, 12, 15, 18, 22, 25, 28, 32, 34, 39, 42 | 8, 10, 12, 15, 18, 22 | 8, 10, 12, 15, 18, 22, 25, 28 | 52 |
| Diameter | M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24 | M4, M5, M6, M8, M10, M12 | M4, M5, M6, M8, M10, M12, M14, M16 | M30 |
| Drive | CH7, CH8, CH10, CH13, CH17, CH19, CH22, CH24, CH27, CH30, CH32, CH36 | CH7, CH8, CH10, CH13, CH17, CH19 | CH7, CH8, CH10, CH13, CH17, CH19, CH22, CH24 | CH46 |
| View product → | View product → | View product → |
The perfect setup for this job
Everything you need in one place, from functionality to safety.
For the job
Spread the load under nuts and screws and stop the fixing coming loose.
Make tie rods, hangers and chemical anchor fixings together with nuts, washers and connectors.
Tighten and loosen nuts and bolts with the open end or the polygonal ring end.








