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Låga sexkantsmuttrar DIN 439 B i syrafast A4 rostfritt stål för säker låsning och stabila skruvförband.
Teknisk måttritning och dimensionstabell för låga sexkantsmuttrar DIN 439 B i syrafast A4 rostfritt stål.
Låga sexkantsmuttrar DIN 439 B i syrafast A4 rostfritt stål för säker låsning och stabila skruvförband.
Teknisk måttritning och dimensionstabell för låga sexkantsmuttrar DIN 439 B i syrafast A4 rostfritt stål.

Hexagon nut thin | A4 | DIN 439

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SKU: 101700
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Description

If you are looking for a thin hexagon nut that enables direct locking of bolted joints in demanding environments without rusting, the DIN 439 B thin hexagon nut in stainless steel is a reliable choice. The nut has a low profile according to DIN 439 B and is used where mounting space is limited but a secure, durable, and corrosion-resistant fastening is still required – especially in marine, industrial, or outdoor environments.

AREA OF USE

The DIN 439 B thin hexagon nut is intended for locking bolted joints, particularly in combination with a counter-nut or lock washer, in environments such as coastal areas, wet rooms, food production, or chemical plants. The metric thread provides a stable connection, and together with a counter-nut or lock washer, it forms a vibration-resistant joint. The product is installed using a socket or a hex wrench and can be combined with standard metric screws. The nut fits flat surfaces of metal, plastic, or stainless steel. The product requires minimal maintenance and has a long service life even in aggressive environments.

TECHNICAL SPECIFICATIONS

Product type: Thin hexagon nut
Standard: DIN 439 B
Grade: A4 / AISI 316
Material class: A4-035 (thin nut)
Thread type: Metric
Surface treatment: Untreated (natural-colored stainless steel)
Head shape: Hexagonal
Grip type: External hexagon

FREQUENTLY ASKED QUESTIONS (FAQ)

What does it mean that the nut has a low profile according to DIN 439 B?

DIN 439 B (essentially equivalent to ISO 4035) specifies the standard for a thin hexagon nut with chamfered edges (Form B):

  • Compact assembly height: The nut is approximately half the height of a standard nut (DIN 934). This makes it ideal for tight spaces where the thread protrusion is short or where lateral/depth space is limited.

  • Chamfered edges (Form B): The chamfer on the outer corners of the nut provides a cleaner finish, prevents the nut from catching on adjacent moving parts, and facilitates tool engagement during tightening.

When should you use a thin hexagon nut instead of a standard nut?

Thin hexagon nuts are primarily used in three specific cases:

  1. Tight spaces: Where a standard nut is simply too thick to fit.

  2. Counter-nut (Locking): Often used together with a standard nut on the same bolt. The thin nut is tightened against the standard nut to create a mechanically locked joint that prevents the screw from unscrewing due to vibrations.

  3. Adjustment and end stops: Suitable as an adjustable stop on threaded rods, rod ends, and clevis bolts where the nut is only subjected to minor axial loads.

Why is acid-proof stainless steel A4 (AISI 316) crucial for marine and industrial environments?

When the nut is mounted in marine or harsh industrial environments, regular stainless steel materials are not sufficient:

  • Saltwater & Coastal environments: A4 steel (1.4401 / AISI 316) contains molybdenum, which provides complete protection against crevice and pitting corrosion from seawater, road salt, and moisture.

  • Chemical resistance: Resists acids, chlorides, and strong cleaning agents in the chemical industry, sewage treatment plants, and food production facilities.

  • Prevents galling during installation: When installing against a stainless/acid-proof screw, it is recommended to use controlled torque and preferably an assembly paste intended for stainless steel to prevent galling.