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Stainless steels can be divided into three groups of steel - austenitic, ferritic and martensitic. Austenitic steel is by far the most common type (>90% of commercial fasteners). The steel groups and strength classes are designated by a four-digit sequence of letters and numbers (eg A2-70) as shown in the following table. DIN EN ISO 3506 governs screws and nuts made from stainless steel.
| Steel group | Steel grade | Strength class | Screws, Nuts and Bolts | NUT load N / mm2 | ||
|---|---|---|---|---|---|---|
| Tensile strength N / mm² | Tensile strength PSI | DIA range | ||||
| Austenitic | A2 and A4 | 50 | 500 | 70,000 | <=M39 | 500 |
| 70 | 700 | 1,00,000 | <=M20 | 700 | ||
| 80 | 800 | 1,18,000 | <=M20 | 800 | ||
The tensile stress is calculated with reference to the tensile stress area (see DIN EN ISO 3506-1979). Nuts to be paired with same grade of stainless steel screws.
| Steel Group | Property Strength Class | Made from | Characteristics |
|---|---|---|---|
| Austenitic | 50 | A1, A2 | SOFT; cold worked, turned and soft pressed fasteners |
| 70 | A2, A4 | Cold worked, normal strength formed fasteners | |
| 80 | A2, A4 | Extreme cold worked, high strength special applications |
| Grade | USA Grade | Material designation | Material no. | ||||||
|---|---|---|---|---|---|---|---|---|---|
| C % (≤) | Si % (≤) | Mn % (≤) | Cr % | Mo % | Ni % | ||||
| A 2 | 304 | X 5Cr Ni 1810 | 1.4301 | ≤ 0.07 | 1.0 | 2.0 | 17.5 TO 19.5 | - | 8.0 TO 10.5 |
| X 2 CR NI 1811 | 1.4306 | ≤ 0.03 | 1.0 | 2.0 | 18.0 TO 20.0 | - | 10 TO 12.0 | ||
| X 8 CR NI 19/10 | 1.4303 | ≤ 0.07 | 1.0 | 2.0 | 17.0 TO 19.0 | - | 11.0 TO 13.0 | ||
| A 4 | 316 | X 5 CR NI MO 1712 | 1.4401 | ≤ 0.07 | 1.0 | 2.0 | 16.5 TO 18.5 | 2.0 TO 2.5 | 10.0 TO 13.0 |
| X 2 CR NI MO 1712 | 1.4404 | ≤ 0.03 | 1.0 | 2.0 | 16.5 TO 18.5 | 2.0 TO 2.5 | 10 TO 13 |
Disclaimer - Dimensional data and technical information for IS 1367 Part 14 was obtained from publicly available sources and not acquired through standards agencies. It has been completed and compiled for reference purposes only; where discrepancies are found they are subject to change without notice. Aim Tech makes no warranties or representations regarding the accuracy and validity of the compiled information and data. Contact the relevant standards authorities for accurate and detailed information.