S1 · Stainless Fasteners
Stainless Fasteners (316 Media and Boundary List)
List the media, grades, and boundary conditions for stainless fasteners related to "stainless fasteners": 5 typical components/processes, including recommended grades, specifications, failure reasons, and standards.
5 Parts and Material List
| Part / Component | Recommended Grade | Specification / Thickness | Surface | Main Failure Modes | Reference Standards |
|---|---|---|---|---|---|
| Hex Cap Screws (Full Thread) | A2-70/A4-70/A4-80/D4-70/D4-80/D6-70/D6-80 | M1.6–M64 | A2-70/A4-70 ≥700MPa；A4-80 ≥800MPa | A2-70/A4-70 ≥450MPa | A2 General Atmosphere/Interior; A4 Chloride/Ice-Resistant Coastal/Chemical; D4/D6 Stainless Steel Groups, equivalent or better corrosion resistance to A4 with higher yield strength |
| Internal Hex Cap Screws (Reduced Load Capacity) | A2-70/A4-70/A4-80 | M3–M16 | Same Group Same Grade | Same Group Same Grade | Design for Reduced Load Capacity |
| Rod | A2-50/A2-70/A4-50/A4-70/A4-80/D4/D6 | Coarse Pitch M2–M68; Fine Pitch M8×1–M72×6 | By Group/Grade | By Group/Grade | Long Rods/Full Thread; A4-80 higher preload but requires hydrogen embrittlement assessment |
| Exterior Anchor Screws for Curtain Walls | S31608（316） | Diameter ≥ 6mm | Per JGJ 133 Anchoring Performance | — | Minimum A4-70 for outdoor exposure; A2-70 suitable for indoor use |
| High-strength duplex bolts (for battery packs, etc.) | QD2001/D4/D6 | M6-M12 common sizes | By D group | Yield Strength Higher Than Austenitic Group | High-Strength + Corrosion Resistance; Watch for Hydrogen Embrittlement and Stress Corrosion Interactions |
Table ContainsStandard ConfigurationSelect materials carefully.
Key considerations
- Most common grade is 316 ().
Frequently asked questions
Which stainless steel is used most frequently with A2-70/A4-70/A4-80/D series fasteners and latest standards?
Total count of parts 5 shows the highest frequency of 316 (1 item). Specific to a part still depends on media and temperature, e.g., stainless countertops require switching from 304 to 316L if exposed to saltwater.
Which part is most prone to issues?
Based on failure descriptions, typical issue is "Hex head bolt (full thread)" with A2-70/A4-70 ≥450MPa. Recommended grades are A2-70/A4-70/A4-80/D4-70/D4-80/D6-70/D6-80, sizes M1.6–M64. For such conditions, media concentration, temperature, and cleaning methods should be specified in the design phase.
Material Properties and Related Industries
Weld Neck Flanges for Seawater Desalination: 2205/2507 PTCBDuplex Flange & DesalinationSanitary Diaphragm Valves/Clean Valves: ASME BPE, Ra, and Temperature BoundariesSanitary ValvesStress Corrosion Cracking in Sensitized and Chloride-Containing Materials: Time-Dependent Concentration BoundariesSensitization & Chloride SCC