DIN 557 Square Nut 201 Stainless Steel

DIN 557 Square Nut 201 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 201 Stainless Steel, at strength class A2-70, 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.

201 is a lower-nickel austenitic stainless with added manganese. It is cheaper than 304 and adequate for dry indoor work, but it pits faster in humid or coastal air — not the grade for outdoor or marine use.

Plain (self-colour) means no coating. On 304 and 316 stainless that is fine — the alloy passivates on its own. On carbon steel it will rust, so choose a coated option instead.

Is this not quite the size or grade you need? Ask us — we produce small batches to drawing and to DIN, ISO, GB and JIS standards, and we consolidate pallet and container loads for trade orders.