DIN 557 Square Nut 316 Stainless Steel

DIN 557 Square Nut 316 Stainless Steel — stocked and shipped worldwide by SFX Fasteners. Available for single-piece retail orders — no minimum order — dispatched from our own warehouse within 24–48 hours.

Technische Daten

Gefertigt nach DIN 557. Dimensions meet the published standard; tolerances per the standard’s normal grade unless stated otherwise. Full dimension table available on request.

Bestellung & Versand

Sie brauchen eine bestimmte Größe, Festigkeitsklasse oder Norm? Senden Sie uns eine Anfrage – wir kalkulieren nach Zeichnung und nach DIN-, ANSI-, GB- und JIS-Normen.

About this DIN 557 nut

This is a nut made to DIN 557, in 316 Stainless Steel, at strength class A4-80, supplied plain. Every dimension is stated against the standard named above; where a tolerance class matters to your design, ask us and we will confirm it in writing before you order.

A nut is the closing half of a bolted joint. Its property class is chosen to match the bolt it is paired with — a class 8 nut for a grade 8.8 bolt, so the thread strips before the bolt breaks. Used wherever a bolt or stud has to be tightened from the far side, and for locking and positioning duties on machinery and steelwork.

A4-80 is 316 stainless cold worked further to 800 MPa minimum tensile. Higher strength than A4-70, with slightly lower ductility.

316 (EN 1.4401, A4) adds 2–3% molybdenum, which is what stops pitting in chloride environments. Specify it for marine air, coastal sites, swimming pools, salt spray, chemical plant and food processing.

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