Flange nut plain | A4 | DIN EN 1661
Do you need a flange nut for demanding environments? The DIN EN 1661 (DIN 6923) flange nut in A4 / AISI 316 acid-proof stainless steel is developed to provide very high corrosion resistance, even in damp, salty, and chemically exposed environments. The nut is designed with a smooth flange surface, which provides even contact without a locking effect.
The integrated flange acts as a built-in washer and distributes the load over a larger surface area. This reduces the risk of damage to the substrate and provides a more stable connection.
The flange nut combines easy installation with high strength and long service life, without the need for extra washers or locking components.
AREA OF APPLICATION
Suitable for fastening in marine environments, coastal structures, the food industry, and chemical and industrial facilities where high corrosion resistance is required. The smooth flange provides a stable contact surface and makes the nut suitable even where the surface should not be affected. Easily installed with a standard wrench or socket wrench and requires minimal maintenance.
TECHNICAL SPECIFICATIONS
Product type: Flange nut
Standard: DIN EN 1661 (formerly DIN 6923)
Grade: A4 / AISI 316 (acid-proof stainless steel)
Material class: A4-70
Thread type: Metric
Surface treatment: Untreated (natural stainless steel)
Head shape: Hexagon with integrated flange
Flange: Smooth flange surface (without locking)
FREQUENTLY ASKED QUESTIONS (FAQ)
What is the advantage of a flange nut compared to a regular hexagon nut?
The integrated flange acts as a built-in washer. It distributes the clamping force over a larger area, which reduces the risk of material damage and prevents the nut from sinking into softer substrates. You also avoid handling loose washers during installation.
Why choose a flange nut in acid-proof A4 / AISI 316?
A4 steel (AISI 316 / 1.4401) contains molybdenum, which provides very high resistance to saltwater, chlorides, and chemicals. This makes the nut suitable for marine environments, coastal structures, and the food industry.
Does this flange nut have a locking effect?
No, the nut has a smooth flange surface and lacks a locking function. If vibration resistance is required, a locking nut with a flange and nylon insert can be used.