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Nuts · ISO 4161 / DIN 6923

A2 Stainless Steel Hex Flange Nuts

Specifying Hex Flange Nuts in A2 Stainless Steel pairs the dimensional form of Hex Flange Nuts (ISO 4161 / DIN 6923) with the engineering properties of A2 Stainless Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.

Why Choose A2 Stainless Steel for Hex Flange Nuts

The most common stainless grade for indoor and general outdoor fasteners. For hex flange nuts, this matters when good general corrosion resistance is the primary requirement.

Mechanical & Physical Properties

Grade designationA2-70 (304)
Magnetic responseLargely non-magnetic
Service temperatureapprox. -200 °C to +400 °C
Corrosion characteristicGood general corrosion resistance

Corrosion Behavior in Service

A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Hex Flange Nuts in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).

Comparable Grades

For Hex Flange Nuts, the alternative stainless grade is A4 (316). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.

Sizes of Hex Flange Nuts Available in A2 Stainless Steel

SizePitch (mm)Flange diameter dc (mm)Nut height m (mm)Width across flats s (mm)Reference standard
M50.811.85.08.0ISO 4161 / DIN 6923
M61.014.26.010.0ISO 4161 / DIN 6923
M81.2517.98.013.0ISO 4161 / DIN 6923
M101.521.810.015.0ISO 4161 / DIN 6923
M121.7526.012.018.0ISO 4161 / DIN 6923
M142.029.914.021.0ISO 4161 / DIN 6923
M162.034.516.024.0ISO 4161 / DIN 6923
M202.542.820.030.0ISO 4161 / DIN 6923
M243.051.124.036.0ISO 4161 / DIN 6923

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quote

Adjust the parameters in the drawing above and click "Request this configuration" to send the exact specification straight to this form.

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Specification
Business Information

Dimensions & Specifications (ISO 4161 / DIN 6923)

SizePitch (mm)Flange diameter dc (mm)Nut height m (mm)Width across flats s (mm)Reference standard
M50.811.85.08.0ISO 4161 / DIN 6923
M61.014.26.010.0ISO 4161 / DIN 6923
M81.2517.98.013.0ISO 4161 / DIN 6923
M101.521.810.015.0ISO 4161 / DIN 6923
M121.7526.012.018.0ISO 4161 / DIN 6923
M142.029.914.021.0ISO 4161 / DIN 6923
M162.034.516.024.0ISO 4161 / DIN 6923
M202.542.820.030.0ISO 4161 / DIN 6923
M243.051.124.036.0ISO 4161 / DIN 6923

Frequently Asked Questions

Is A2 Stainless Steel food-grade?

A2 (304) is widely accepted for food contact in non-chloride environments; A4 (316) is preferred where chlorides are present.

Can A2 Stainless Steel Hex Flange Nuts be used with aluminum?

Yes, but stainless drives mild galvanic corrosion of aluminum in wet service — isolate with a coating, sleeve or paint, or accept the trade-off if the joint is dry and indoor.

What's the service temperature limit for A2 Stainless Steel?

The practical service range is approx. -200 °C to +400 °C.

Can A2 Stainless Steel replace plated alloy steel structurally?

Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.