Stainless fasteners in A2 (304) and A4 (316) class — hex bolts, nuts, washers, stud bolts, anchor fasteners and self-drilling screws. Marine and coastal projects should specify A4.
| Grades available | A2-70 / A4-80 |
|---|---|
| Sizes | M4 to M36 |
| Finish | Bright / passivated |
| Minimum order | As per item |
| Standard | ISO 3506 / DIN 933 / DIN 934 |
| Items | Hex bolt, nut, washer, stud, screw, anchor |
| Class | A2-70, A4-80 |
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Get quote on WhatsAppEnter your size and we work out the theoretical weight using the density of the grade you pick.
Theoretical weight only. Mill rolling tolerance normally makes the delivered weight differ by 2–5%; we invoice on actual weighbridge weight.
What the metal is actually made of, as specified by the standard.
The default austenitic grade — about half of all stainless sold. Good corrosion resistance, easy to form and weld.
Strip shows the mid-point of each specified range, with iron as balance. The table below is the full specification.
| Element | Name | Specified % by weight | |
|---|---|---|---|
| C | Carbon | ≤ 0.070 | |
| Mn | Manganese | ≤ 2.00 | |
| Si | Silicon | ≤ 0.750 | |
| P | Phosphorus | ≤ 0.045 | |
| S | Sulphur | ≤ 0.030 | |
| Cr | Chromium | 17.50 – 19.50 | |
| Ni | Nickel | 8.00 – 10.50 | |
| N | Nitrogen | ≤ 0.100 | |
| Fe | Iron | Balance | ≈ 70.8% |
Limits as per ASTM A240 / A276. Always confirm against the mill test certificate for your consignment.
Cut-to-length, slitting and custom sections are done in-house. Send the drawing or the dimensions and we will confirm price and lead time.