18-8 Stainless Steel Extra Thick Flat Washers
What are 18-8 stainless extra thick flat washers? 18-8 stainless steel extra thick flat washers are heavy-duty washers with greater thickness than standard washers, made from corrosion-resistant 18-8 stainless. The extra material resists bending and dishing under heavy load, while the stainless grade resists rust in wet and outdoor use.
Why use a stainless extra thick washer?
An 18-8 stainless extra thick washer combines added thickness with corrosion resistance, so it holds its shape under high-torque bolts, over oversized or slotted holes, and on soft surfaces, while resisting rust outdoors and in freshwater. The extra material stops the washer from dishing and losing clamping force. Pair it with 18-8 or 304 stainless bolts and nuts so the whole joint shares the same corrosion resistance. For coastal or saltwater exposure, choose 316 or metric A4.
Why choose 18-8 stainless extra thick flat washers
- Resists bending: extra material holds shape under heavy load.
- Corrosion resistant: 18-8 stainless resists rust in wet and outdoor use.
- Bridges gaps: spans oversized and slotted holes without dishing.
- Non-staining: will not rust-streak the mounting surface.
Common applications for 18-8 extra thick washers
- Outdoor heavy equipment and machinery
- Structural repair in wet environments
- Oversized and slotted holes outdoors
- Marine-adjacent and freshwater work
For high-strength hardened performance, see Grade 8 yellow zinc extra thick flat washers, and browse every option on the main flat washers category.
18-8 Stainless Extra Thick Flat Washers FAQ
When should I use an extra thick washer?
Use one where a standard washer would bend or dish, such as under high-torque bolts, over oversized holes, or on soft surfaces, with stainless where corrosion is a concern.
Is 18-8 good for coastal use?
18-8 handles most outdoor and freshwater exposure but can pit in salt. For coastal or saltwater use, choose 316 or metric A4.
Should the washer match the bolt grade?
Yes. Pairing 18-8 washers with 18-8 or 304 stainless bolts and nuts avoids a corrosion weak point in the joint.