304 vs 316 Stainless Steel: Which Fastener Do You Need?
Not all stainless steel is the same. A 304 fastener can last for years outdoors, while a 316 fastener may be the only one that survives saltwater. This guide compares 304 and 316 stainless steel for fasteners.
What Do 304 and 316 Mean?
304 and 316 are grades of stainless steel. Both resist rust, but 316 contains molybdenum, which gives it much better resistance to chlorides such as salt water.
304 vs 316: Quick Comparison
| Feature | 304 | 316 |
|---|---|---|
| Corrosion resistance | Good for general outdoor use | Excellent, including saltwater |
| Cost | Lower | Higher |
| Best for | Rain, humidity, coastal inland | Marine, chemical, food processing |
When to Use 304
Use 304 stainless for general outdoor fastening, railings, architectural fittings and fresh-water environments. It is the cost-effective choice for most non-marine work.
When to Use 316
Use 316 stainless for marine, saltwater, chemical and food-contact applications. It is the standard choice for boat hardware, docks and coastal installations.
FAQ
Is 316 worth the extra cost?
In saltwater or chemical environments, yes. In dry or fresh-water conditions, 304 is usually sufficient.
Can 304 and 316 be mixed?
They can be used together, but for a marine assembly use matching 316 components to avoid galvanic corrosion.
Stainless Fasteners for Every Environment
SolidLink supplies stainless steel bolts, nuts and rigging hardware in 304 and 316 grades. Browse our bolts or fasteners category, or contact us for a quote.
