Square Weld Nuts DIN 928
Our Square Weld Nuts are manufactured to DIN 928 standards and designed to create permanent threaded fixing points on suitable metal surfaces. Also known as square projection weld nuts or weldable square nuts, these four-sided fasteners feature four welding projections that fuse to the parent material during the resistance welding process. Once correctly welded into position, they provide a fixed internal thread for securing compatible bolts, screws and other threaded components.
Available in A2 and A4 Stainless Steel, our DIN 928 Square Weld Nuts offer corrosion resistance for a range of manufacturing, engineering and metal fabrication applications. Their square profile and four welding projections provide a practical fastening solution for sheet metal assemblies, machinery components, equipment housings and fabricated metal structures where a permanent threaded connection is required.
We stock Stainless Steel Square Weld Nuts in metric thread sizes from M4 to M12, providing options for different assembly requirements. These weld-on nuts are particularly useful where access to the reverse side of a metal panel is restricted after assembly or where a fixed nut is required to simplify subsequent installation and maintenance.
Key Features & Benefits of Square Weld Nuts
- DIN 928 Standard – Manufactured to defined dimensional specifications for square projection weld nuts
- Four Welding Projections – Designed to form a permanent connection with suitable metal surfaces during resistance projection welding
- A2 Stainless Steel – Provides corrosion resistance for suitable general engineering and manufacturing applications
- A4 Stainless Steel – Offers enhanced corrosion resistance for more demanding environments
- Permanent Threaded Fixing – Creates a fixed internal thread for compatible bolts and screws
- Metric Thread Sizes – Available from M4 to M12 to suit different fastening requirements
- Square Profile – Four-sided design provides a practical fastening solution for fabricated metal components
- Efficient Assembly – Allows threaded components to be installed without holding a separate loose nut during final assembly
Common Applications for DIN 928 Square Weld Nuts
Square projection weld nuts are widely used in metal fabrication and manufacturing processes where a secure, permanent threaded connection is required. Their four welding projections allow the nut to be attached to a suitable metal surface before the final assembly of other components.
- Sheet Metal Fabrication – Creating permanent threaded fixing points on compatible metal panels and fabricated components
- Automotive Manufacturing – Securing suitable brackets, panels and non-structural vehicle components
- Industrial Machinery – Providing fixed threaded connections for machinery covers, brackets and equipment assemblies
- Electrical Enclosures – Attaching suitable mounting brackets and internal components to metal housings
- Metal Furniture Manufacturing – Creating threaded mounting points in suitable fabricated furniture frames
- Engineering & Manufacturing – Producing repeatable threaded fastening points during metal component assembly
How Do Square Weld Nuts Work?
DIN 928 Square Weld Nuts feature four raised projections on the welding face. During resistance projection welding, electrical current and pressure are applied to the nut and the compatible parent metal. Heat is concentrated at the projections, allowing them to fuse with the metal surface and form a permanent connection.
Once the welded joint has been completed and inspected, the internal thread provides a fixed fastening point for a compatible metric bolt or screw. This eliminates the need to position and hold a separate nut during subsequent assembly operations.
The quality of the welded connection depends on factors including material compatibility, surface condition, welding equipment and process settings. Appropriate welding procedures should be followed to achieve the required joint strength.
A2 vs A4 Stainless Steel Square Weld Nuts
Our Stainless Steel Square Weld Nuts are available in both A2 and A4 grades, allowing material selection according to the intended application and operating environment.
- A2 Stainless Steel Square Weld Nuts – Suitable for many general manufacturing, engineering and indoor applications where corrosion resistance is required
- A4 Stainless Steel Square Weld Nuts – Provide enhanced resistance to corrosion in environments involving greater moisture exposure or certain corrosive conditions
When selecting stainless steel weld nuts, consider the material of the component being welded, the required corrosion resistance and the suitability of the welding process. Stainless steel grades should be selected according to the complete assembly requirements.
Square Weld Nuts vs Hex Weld Nuts
Square Weld Nuts and Hex Weld Nuts both provide permanent internally threaded fastening points on suitable metal surfaces. The main differences are their shape, dimensional standards and welding projection arrangements.
Our Square Weld Nuts DIN 928 feature a four-sided profile with four welding projections. Alternatively, our Hex Weld Nuts DIN 929 feature a six-sided profile with three welding projections.
For applications requiring an externally threaded fastening point rather than an internally threaded nut, we also supply Male Threaded Weld Studs ISO 13918 Type PT.
The most suitable weldable fastener will depend on the required thread size, component geometry, material compatibility and welding process.
How to Choose the Correct Square Weld Nut
When selecting a DIN 928 Square Weld Nut, consider the metric thread size, stainless steel grade, nut dimensions and the material of the component being welded. The nut must provide sufficient thread engagement for the intended bolt or screw while remaining compatible with the available installation space.
It is also important to assess the required joint strength and confirm that the welding equipment and process are suitable for the selected materials. For applications involving vibration, repeated loading or demanding operating conditions, the complete fastening assembly should be evaluated.
Need Square Weld Nuts for Your Manufacturing or Fabrication Project?
Whether you are sourcing DIN 928 Square Weld Nuts for sheet metal fabrication, selecting A2 or A4 Stainless Steel Weld Nuts for machinery assembly or looking for permanent threaded fixings for industrial production, our team can help you identify the correct product. With metric thread sizes from M4 to M12 available, we can assist with material selection, dimensional compatibility and specialist fastening requirements.
Call 01233 713 581 for technical guidance, product sample enquiries, specialist requirements or bulk order quotations. Metal fabricators, engineering companies, manufacturers and trade customers can also apply for a Vital Parts Business Account to enquire about trade pricing, credit account options and dedicated account support.
Frequently Asked Questions
The four raised projections concentrate heat during resistance projection welding. Under the correct welding conditions, these projections fuse with the parent metal to create a permanent connection between the nut and the surface.
DIN 928 square weld nuts are designed for resistance projection welding, which requires suitable welding equipment capable of applying controlled electrical current and pressure. Conventional welding equipment may not provide the intended installation method.
Joining stainless steel weld nuts to mild steel may be possible using an appropriately developed welding procedure. However, differences in material properties, corrosion behaviour and welding characteristics must be considered before production.
Yes. Projection weld nuts are commonly used in sheet metal fabrication. However, the minimum suitable sheet thickness depends on the nut dimensions, parent material and welding conditions.
Yes. Square projection weld nuts can be incorporated into suitable automated welding and assembly processes. Their fixed threaded connection can simplify subsequent fastening operations.
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