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304 vs. 316 Stainless Steel for Glass Spigots: Which Grade Should You Specify?
| Grade | Key Composition | Corrosion Resistance | Best For |
|---|---|---|---|
| 304 (A2) | 18% chromium, 8% nickel | Good resistance to rust in normal conditions | Indoor applications, dry climates, general construction |
| 316 (A4 / Marine Grade) | 16% chromium, 10% nickel, 2-3% molybdenum | Excellent resistance to chlorides and salt spray | Coastal areas, pool fences, high-humidity environments |
The molybdenum in 316 is the game-changer. It provides superior protection against pitting and crevice corrosion—the kind that silently eats away at hardware in salty or chlorinated environments.
From a structural standpoint, 304 and 316 have very similar tensile strength. Both easily meet standard load requirements for glass balustrades when properly engineered.
The real difference shows up years later.
- 316 stainless steel hardware can last 25+ years without significant corrosion, even in demanding outdoor settings.
- 304 stainless steel or aluminium is the leading cause of premature failure in harsh environments. It pits, stains, and risks structural collapse.
The bottom line: The marginal cost increase for 316 (typically 15-20%) is negligible compared to the liability, replacement costs, and reputational damage of failed hardware within 2-3 years.
Railing‑O manufactures both 304 and 316 stainless steel spigots with full material traceability and salt-spray test reports.
Send your inquiry directly to us
