Weld nut | A2 | DIN 929

Do you need a nut that can be permanently welded onto surfaces for secure and stable fastening? The Weld Nut A2 DIN 929 in A2 / AISI 304 stainless steel is designed to provide long-term strength and corrosion resistance. It is easy to weld onto metal surfaces, creating a reliable connection that withstands mechanical stress and vibrations. The nut is ideal for both industrial and construction-related applications where a permanent attachment is required.

FIELD OF APPLICATION

Perfect for weld assembly on machinery, steel frames, building structures, and equipment where permanent fasteners are needed. The weld nut is used to create a secure fastening point for screws and bolts and is easy to combine with standard tools when assembling components. Its corrosion resistance makes it suitable for both indoor and outdoor environments.

TECHNICAL SPECIFICATIONS

Product type: Weld nut
Standard: DIN 929
Grade: A2 / AISI 304 stainless steel
Material class: A2-70
Thread type: Metric ISO thread
Surface treatment: Untreated (natural stainless steel)
Head shape: Hexagonal
Drive type: External hex

FREQUENTLY ASKED QUESTIONS (FAQ)

What characterizes a weld nut according to DIN 929 and how do the welding projections work?

DIN 929 specifies a hexagonal weld nut with three raised welding projections (weld points) on the underside:

• Precise resistance welding: The three welding projections concentrate the current and heat during spot welding or resistance welding. This allows the nut to fuse perfectly with the base material without damaging the internal thread.

• Permanent and vibration-proof threaded point: Once welded, the nut forms a homogeneous unit with the sheet metal or profile. It cannot loosen, rotate, or shift, making it excellent for chassis, machine stands, and equipment exposed to heavy vibrations.

• Time-saving for blind assembly: Creates a fixed thread on the reverse side of enclosures and beams where it is impossible to reach with a fixed wrench for future assembly or maintenance.

Why choose stainless steel A2 (AISI 304) when welding nuts?

Welding stainless steel structures places high demands on material composition to preserve corrosion protection:

• Good weldability: A2 steel (1.4301 / AISI 304) has low carbon content and good welding properties, providing strong, crack-free weld seams during both spot welding and TIG welding.

• Lasting corrosion protection: Withstands moisture, outdoor environments, and damp industrial premises without rusting or weakening around the weld zone.

• No flaking surface coating: Unlike electro-galvanized weld nuts, you avoid hazardous zinc fumes during welding as well as the risk of burning off the zinc layer, which could otherwise cause the nut to rust.

What should be considered to achieve a successful welding result with DIN 929?

1. Clean surfaces thoroughly: Ensure that the sheet metal or profile is completely free from grease, oil, paint, and oxides where the welding projections are to make contact.

2. Protect the thread during TIG welding: If you are TIG welding by hand instead of using spot welding, be careful not to place the weld bead too close to the thread opening to prevent spatter or thermal deformation from ruining the threads.

3. Use correct filler material and lubricant: Use stainless filler material that matches A2 steel and apply assembly paste to the screw during final assembly to prevent thread seizing (galling).