Stainless Steel Fasteners – A2 and A4 Bolts, Nuts, Screws, and Washers
ULAMEX supplies a comprehensive range of stainless steel fasteners for industrial, construction, marine, and architectural applications. Our fastener programme covers hexagon bolts, hex nuts, flat washers, spring washers, self-tapping screws, set screws, threaded rods, rivets, and pins – all available in corrosion-resistant A2 (grade 304 / 1.4301) and A4 (grade 316L / 1.4404) stainless steel. From individual boxes to multi-tonne project orders, we deliver stainless steel fasteners in bulk across Europe with typical lead times of 2-5 working days from our 60,000 m² warehouse facility near Lodz, Poland.
Every fastener in our programme is manufactured to current DIN, ISO, and EN standards and supplied with material documentation on request. Whether you are assembling stainless steel profiles, connecting piping systems, or securing outdoor and marine structures, our stainless steel bolts, nuts, and screws provide the reliable, maintenance-free fastening solution your project demands.
Material Grades – A2 vs A4 Stainless Steel
Selecting the correct material grade is the single most important decision when specifying stainless steel fasteners. ULAMEX stocks both major grades to ensure you can match the fastener to the corrosion environment:
| Property | A2 (Grade 304 / 1.4301) | A4 (Grade 316L / 1.4404) |
|---|---|---|
| Werkstoff number | 1.4301 (also 1.4303) | 1.4401 / 1.4404 (low carbon) |
| AISI equivalent | AISI 304 | AISI 316 / 316L |
| Chromium content | 17.5-19.5 % | 16.5-18.5 % |
| Nickel content | 8.0-10.5 % | 10.0-13.0 % |
| Molybdenum content | – | 2.0-2.5 % |
| Property class | A2-70 (700 MPa tensile) | A4-80 (800 MPa tensile) |
| Proof stress (0.2 %) | 450 MPa | 600 MPa |
| Corrosion resistance | Good – indoor, moderate outdoor | Excellent – marine, chemical, chloride |
| Magnetic properties | Slightly magnetic after cold work | Non-magnetic |
| Typical applications | Construction, food processing, architecture | Marine, chemical plant, coastal, pools |