Extra Thick Flat Washers
What are extra thick flat washers? Extra thick flat washers are heavy-duty washers with greater thickness than standard, USS, or SAE washers, giving added strength to resist bending and dishing under heavy or concentrated loads. The extra material spreads high clamping force and bridges gaps or oversized holes without deforming.
When do I need an extra thick washer?
A standard-thickness washer can bend, dish, or pull into an oversized or slotted hole under heavy load, which loses clamping force and weakens the joint. An extra thick washer has more material to resist that deformation, so it holds its shape and spreads load reliably under high-torque bolts, on soft or uneven surfaces, and over enlarged holes. Choose extra thick washers for heavy equipment, structural repair, and any joint where a normal washer would flex. Match the material to the environment and load, with 18-8 stainless for corrosion resistance and Grade 8 yellow zinc for high-strength hardened performance.
Why choose extra thick flat washers
- Resists bending: extra material holds shape under heavy load.
- Bridges gaps: spans oversized and slotted holes without dishing.
- Spreads high load: distributes force from high-torque bolts.
- Material options: 18-8 stainless and Grade 8 yellow zinc.
Common applications for extra thick flat washers
- Heavy equipment and machinery
- Structural repair and reinforcement
- Oversized and slotted holes
- Soft or uneven mounting surfaces
For standard-thickness washers, see standard flat washers, and browse every option on the main flat washers category.
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 or slotted holes, or on soft and uneven surfaces.
What materials do extra thick washers come in?
18-8 stainless for corrosion resistance and Grade 8 yellow zinc for high-strength hardened performance.
Are extra thick washers the same as hardened washers?
Not necessarily. Extra thick refers to added thickness for stiffness, while hardened refers to heat treatment for strength. The Grade 8 version offers both.