Weld Nuts
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Weld nuts
Weld nuts provide a permanent, metallurgical bond that adds strong internal threads to sheet metal and components. They simplify the assembly of bolted connections. Because the nut is fixed to the part, there’s no need to hold it in place when driving the screw later on — a major advantage in hard-to-reach areas.
Installed by projection or spot welding, weld nuts handle both tensile and shear loads. Their compact design helps prevent rotation. Standardized versions, such as DIN 928 and DIN 929, make design and production more efficient.
The ETTINGER B2B online shop offers a broad range of weld nuts in steel and stainless steel. Available directly from stock, including for large-volume orders.
Weld Nut Designs
- Square Weld Nuts (DIN 928)
- Easy to position thanks to straight outer edges
- Four projections ensure a flat seat and high resistance to rotation
- Hex Weld Nuts (DIN 929)
- Industry standard with three projections
- Even load distribution and stable seating
The precisely defined weld projections act as contact points during resistance welding. They melt in a controlled way and create a uniform joint without distorting the base material.
Thread Sizes, Design, and Material
| Thread | Design | Material |
| M3 | Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M4 | Square & Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M5 | Square & Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M6 | Square & Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M8 | Square & Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M10 | Square & Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M12 | Hex | Steel, Stainless Steel A2, Stainless Steel A4 |
| M14 | On request | On request |
Why Material Matters for Weldability
For a true metallurgical bond, the material must match the base component precisely. Our weld nuts are optimized for thermal joining processes — from standard applications to high-performance variants for extreme conditions. Steel weld nuts are intentionally supplied without surface coating to avoid compromising weld quality.
Steel is the go-to material for most industrial applications. In chemical processing and marine environments, A4 stainless steel is preferred for its superior corrosion resistance and durability.
Advantages and Applications by Material
| Material | Properties | Applications |
| Steel | Excellent weldability, no harmful fumes or spatter | General mechanical engineering, automotive bodies and frames |
| Stainless Steel A2 | Good resistance to weathering and moisture | Kitchen equipment, appliance manufacturing, outdoor applications |
| Stainless Steel A4 | Acid-resistant and chloride-resistant; maximum corrosion protection | Chemical industry, medical technology, marine applications |
FAQ – Weld Nuts
What is a weld nut?
A weld nut is a fastener with an internal thread that is permanently welded onto sheet metal or a component.
What designs are available?
Square (DIN 928) and hex (DIN 929). Square for precise positioning, hex as the industry standard.
What materials are used?
Standard steel (plain), stainless steel A2 (corrosion-resistant), stainless steel A4 (acid- and chloride-resistant).
What thread sizes are available?
From M3 to M12; M14 available on request.
How are weld nuts installed?
By projection welding or spot welding. The projections ensure a strong joint and high resistance to rotation.
Where are weld nuts used?
Mechanical engineering, automotive, equipment manufacturing, chemical industry, and marine applications.
What is the difference between a weld nut and a projection weld nut?
There is no difference in practice. Both terms refer to the same component. “Projection weld nut” is more common in certain regions and industries, while “weld nut” is the standard term in technical trade.
What are the advantages of weld nuts?
High load capacity, consistent strength, minimal post-processing, fast installation, ideal for hard-to-access areas.
Why are weld nuts used in hard-to-reach areas?
Because the nut is welded in place before assembly, it does not need to be held during screw installation. This makes it ideal for closed profiles, cavities, or housings.
Can custom sizes be ordered?
Yes. M14 and other special sizes are available on request.
Quality from ETTINGER – your requirements are our mission
For more than 60 years we have been supplying fasteners and electromechanical components in accordance with widely recognized standards. We rely on qualified employees, strict incoming goods inspections and innovative technologies to ensure that we consistently meet our high quality standards for battery and soldering technology as well as other electromechanical accessories.
At ETTINGER, we prefer to manufacture and source our parts in Germany. Thanks to long-standing, reliable business relationships with our suppliers we now have strong partners at our side, which in turn enable us to offer you products of the highest quality.
Quality through service and expertise. When you buy components from ETTINGER, you can enjoy peace of mind and confidence in your project.
About ETTINGER
ETTINGER GmbH is based in Hofolding near Munich and has been supplying an extensive range of mechanical components for electronics production for over 60 years. Approximately 25,000 products are permanently available from stock and we can supply another 15,000 products in line with specific customer requirements. We supply many industry sectors with our precision turned parts.
- Agricultural engineering
- Automotive sector and industry
- Battery technology
- Charging infrastructure
- Electromobility
- Electronics manufacturing
- Environmental and solar technology
- Fuel cell technology
- Measurement engineering
- Mechanical engineering
- Medical technology
- Robotics
- Sensor technology
- and more.