Flange nut plain | A2 | DIN EN 1661
Do you need a flange nut for environments with moderate moisture? Flange nut DIN EN 1661 (DIN 6923) in A2 / AISI 304 stainless steel provides good corrosion resistance and is suitable for both indoor and outdoor use where the environment is not highly aggressive. The nut features a smooth flange surface, providing even contact without a locking effect.
The integrated flange acts as a built-in washer and distributes the load over a larger area. This reduces the risk of damage to the surface and provides a more stable connection.
The flange nut combines easy installation with good strength and a long service life, without the need for extra washers or locking components.
AREA OF APPLICATION
Suitable for fastening in building structures, machine parts, and installations in environments with normal moisture exposure. Not recommended for marine or highly chemical environments. The smooth flange provides a stable contact surface and is particularly suitable where the substrate should not be damaged. Easily installed with a standard wrench or socket wrench.
TECHNICAL SPECIFICATIONS
Product type: Flange nut
Standard: DIN EN 1661 (formerly DIN 6923)
Grade: A2 / AISI 304 (stainless steel)
Material class: A2-70
Thread type: Metric
Surface finish: Untreated (natural stainless steel)
Head shape: Hexagon with integrated flange
Flange: Smooth flange surface (non-locking)
FREQUENTLY ASKED QUESTIONS (FAQ)
What is the advantage of using a flange nut (DIN 6923) compared to a regular hex nut?
The integrated flange acts as a built-in washer. It distributes the clamping force over a larger area, which reduces the risk of damage to the material being fastened and prevents the nut from sinking into softer surfaces. In addition, you save time during assembly since you do not have to handle loose washers.
What does it mean that the flange nut is made of stainless A2 / AISI 304?
A2 steel (AISI 304 / 1.4301) provides excellent corrosion protection in outdoor environments, damp areas, and normal industrial environments. It is the perfect choice when you need a stainless and durable connection that is not exposed to direct marine environments, salt water, or strong acids (where A4 is recommended).
Does the flange nut have serrations on the underside?
DIN 6923 is manufactured both with a smooth flange and with a serrated/toothed underside (locking teeth). The serrated version acts as a mechanical lock that grips the surface and prevents the nut from vibrating loose in dynamically loaded structures.