Metric 316 Stainless Steel Fender Washers (A4)

When should I use A4 metric fender washers?

A4 is the metric designation for a molybdenum-alloyed marine-grade stainless comparable to 316, giving far better resistance to salt and chloride pitting than A2. As a metric fender washer it combines that corrosion resistance with a wide outer diameter that stops nuts and bolt heads from pulling through thin material, ideal for coastal and marine metric assemblies. Match the washer to your metric bolt size, and pair it with A4 metric bolts and nuts so the whole joint shares the same protection.

Why choose metric 316 stainless fender washers

• Marine-grade corrosion resistance: A4 is molybdenum-alloyed like 316.
• Wide bearing: oversized diameter resists pull-through in thin material.
• Metric sizing: matched to M-series bolt diameters.
• Match grade: pairs with A4 metric hardware.

Common applications for metric 316 fender washers

• Marine and coastal metric hardware
• Boats, docks, and saltwater exposure
• Thin metric panels in wash-down settings
• Chlorinated and chemical metric assemblies

For general metric freshwater use, see A2 metric stainless fender washers, and browse every material on the main fender washers category.

Metric 316 Stainless Fender Washers FAQ

Is A4 the same as 316 stainless?

A4 is the metric grade comparable to 316. Both are molybdenum-alloyed marine-grade stainless with excellent salt and chloride resistance.

What metric sizes are available?

Common metric diameters such as M6, M8, and M10. Match the washer to your metric bolt size.

When should I choose A4 over A2?

Choose A4 for coastal, saltwater, and chloride exposure. A2, comparable to 304, suits general outdoor and freshwater use.