You’ve probably heard about decks that fall apart after just one season, and it often comes down to using the wrong fasteners. You’ve probably seen it before: rusty screws, weak structures, and the constant need for repairs.
Marine environments can be pretty tough, so it’s important to use screws that are built to handle corrosion, saltwater, and all that moisture.
We tested a lot of different screws for marine use and found that 316 stainless steel screws are the best without a doubt..
Marine Stainless Steel Fasteners: The Best Choice
316 marine screws are the best choice for use in marinas out of all the options that are offered.
The reason they work so well is in their make-up: 316 stainless steel has molybdenum, nickel, and chromium in it. Molybdenum helps the metal resist pitting and crevice corrosion in places with a lot of chloride, like saltwater. The increased nickel content makes the material better at resisting corrosion, and chromium helps create a protective oxide layer on the surface.
Why Not Use 304 Grade Stainless Steel Screws?
304 stainless steel isn’t the best choice, particularly for installations within 5 kilometers (3 miles) of the coast. Make no mistake, they will last for years, but they lack the superior corrosion resistance of 316 grade stainless steel.
When to Use Different Types of Marine Grade Stainless Steel Screws
| Screw Type | Applications | Advantages | When to Use | Sealant Compatibility | Safety |
| Countersink Head | Decking, flooring, trim work | Sits flush with surface | Ideal for decking or any application requiring a smooth finish | Compatible with most sealants; use as recommended | Reduces risk of snagging on clothing or causing injury |
| Round Head | Signs, decorative elements, temporary structures | Visible fastener, easy removal | When a visible fastener is acceptable or preferred | Can be used with sealants; allows for easy inspection | Potential snagging risk; use in low-traffic areas |
| Hex Head | Structural components of marinas, heavy-duty applications | High torque capability | Applications requiring significant strength or frequent adjustment | Compatible with industrial sealants; use as needed | Generally safe; larger head provides better load distribution |
| Pan Head | Low-profile applications, thin material fastening | Balance between flush mounting and visibility | When slight protrusion is acceptable but full round head is too much | Can be used with sealants; allows for some water runoff | Lower profile than round head; moderate snagging risk |
Tips on Using 316 Stainless Steel Screws
Make sure to pair screws and components properly
It’s important to use stainless steel screws with stainless steel components to avoid any issues with galvanic corrosion. Mixing different metals can speed up corrosion.
Make sure the screws can support your project
Marine screws made of stainless steel are available in different sizes and strengths. Select screws that can properly handle the expected weight, taking into account factors such as foot traffic, equipment weight, and environmental forces.
Install Screws the Right Way
- Pre-drill holes to avoid splitting in wood applications
- Make sure that you choose the right size and length of screw for the task.
- Make sure the screws are driven straight and to the proper depth
Maintenance and Inspection
Regularly look for any signs of loose fasteners, or damage to the structure, especially on staircases, balustrades and railings. Maintain timber by using a recommended oil or paint. If you find any damaged or split component, replace them right away.
Avoiding Over-Tightening
Using too much force can ruin the screw heads, harm the surrounding material or strip the threads. On the other hand, screws not driven all the way home can cause injury. Bolts and structural fasteners can fail in their application if under-torqued.
Consider Expansion and Contraction
In marina settings, materials tend to expand and contract because of changes in temperature. It’s important to keep this in mind when you’re working with wood materials for coastal decks, docks, and other outdoor structures.
- Allow for slight movement in the construction
- Structures should be cross-braced to limit movement
- Countersink screw heads below the surface to prevent heads becoming exposed through seasonal changes.
Buy From The Top Stainless Steel Manufacturer
Don’t let bad fasteners damage the structure of your coastal structures. Buy the best 316 marine grade stainless steel screws to keep your structures lasting longer, safe, and performing well.
The best marine fasteners from Eagle Claw Co. are designed to protect against corrosion for a long time. Because our marine grade screws are made by experts with a wealth of coastal construction knowledge, you can be sure that the products you receive will satisfy the unique demands of coastal structures.
