Weld Nuts (DIN 929)
What is DIN 929?
DIN 929 specifies the dimensions and technical requirements for hexagonal weld nuts. These nuts are designed to be permanently attached to a metal surface through welding, creating a durable and high-strength threaded point. Their design typically includes a pilot collar for alignment and weld projections (or "nubs") around the base. These projections concentrate heat during welding, ensuring a strong, consistent weld while protecting the internal threads from distortion and spatter.
What are the advantages of Weld Nuts vs. Press-Fit or Rivet Nuts?
Weld nuts offer a superior permanent thread solution in thin or thick sheet metal, especially where extreme pull-out and twist resistance are critical.
Permanent, Integral Fastening: Unlike press-fit or rivet nuts which are mechanically attached, weld nuts fuse with the base metal through a weld, creating a metallurgical bond. This virtually eliminates the risk of the nut spinning or pulling out under load.
Consistent, High-Strength Welds: The integrated weld projections ensure focused heat application. This leads to uniform weld quality, minimizes heat distortion of the nut threads, and results in a joint strength that often matches or exceeds the base material.
Built-in Protection & Alignment: The pilot collar serves multiple functions: it centers the nut in the pre-drilled hole, holds it in place during welding, and shields the internal threads from weld spatter.
Material Selection Guide for Weld Nuts
Choosing the correct material is essential for ensuring weld compatibility, strength, and long-term performance in the intended environment.
| Material | Key Properties & Weld Compatibility | Ideal Application | Notes |
| Steel (Typically Uncoated) | High strength, economical. Requires minimal surface prep. Must be welded to uncoated/low-carbon steel surfaces. | General industrial use in dry, indoor environments. | Prone to corrosion (rust) when exposed to moisture. Post-weld plating/painting may be required. |
| 18-8 / A2 Stainless Steel | Good corrosion resistance, resists rust from water and mild chemicals. Weld to stainless steel surfaces. | Outdoor applications, food processing, environments with occasional moisture or mild chemical exposure. | Offers a balance of corrosion resistance and cost. Not suitable for highly corrosive (e.g., chloride) environments. |
| Grade 2 Titanium | Excellent strength-to-weight ratio (~40% lighter than steel) and exceptional corrosion resistance, withstands salt water, acids, and harsh chemicals. Weld to titanium surfaces. | Aerospace, marine, chemical processing, and medical equipment where maximum corrosion resistance and weight savings are critical. | Note: Grade 2 Titanium Weld Nuts are typically made-to-order and are not held in standard inventory. |
Download DIN 929 Dimensions pdf and IDIN 929 Weight Chart or views online
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Active Stock List (All items are currently in stock)：
| PIC | PRODUCT | SIZE | GRADE | FINISH | THREAD |
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Weld Nuts (DIN 929) - Stainless Steel (A2) | M3-M16 | A2 Grade | Natural | Coarse |
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Weld Nuts (DIN 929) - Marine Stainless Steel (A4) | M3-M16 | A4 Grade | Natural | Coarse |
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Weld Nuts (DIN 929) - Low Carbon Steel | M3-M16 | C-1008 Grade | Bare | Coarse |