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SKU: ABW516-SS

5/16" Conquest USS Flat Washer - 18-8 Stainless Steel

5/16" Conquest USS Flat Washer - 18-8 Stainless Steel!

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Nuts and Washers
SKU: ABW516-SS

5/16" Conquest USS Flat Washer - 18-8 Stainless Steel

$0.13
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Diameters:

1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8" 1"

Type:

18-8 Stainless Steel 316 Stainless Steel

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Specifications

Diameter: 5/16"
Thickness: 0.055" - 0.069"
Outside Diameter: 0.87" - 0.885"
Inside Diameter: 0.34" - 0.355"
Thread Type: Coarse
Material: 18-8 Stainless Steel
Finish: Plain
Type: 18-8 Stainless Steel
Measuring System: USS
Manufacturer Name: Conquest Fasteners
Quantity: Single
Description

5/16" Conquest USS Flat Washer - 18-8 Stainless Steel

The 5/16" USS flat washer delivers reliable load distribution and surface protection in high-moisture or corrosive environments. Built from 18-8 stainless steel, it provides a rust-resistant barrier between fastener and material. The wide bearing surface reduces pressure points and helps prevent pull-through. It’s ideal for coastal construction, wet environments, and stainless hardware assemblies.

Always confirm washer and bolt compatibility prior to installation for optimal load distribution.

5/16" USS Flat Washer – Rust-Resistant Support for Stainless Fasteners

This washer offers consistent strength and corrosion protection in a clean, easy-to-install format. Perfect for outdoor assemblies where reliability is a must.

Key Features

  • Stainless Steel Build: Made with 18-8 alloy for long-term durability.
  • Wide Load Coverage: Protects material from fastener damage.
  • USS Pattern: Provides compatibility with coarse-thread bolts.
  • Snug Fit: Machined ID reduces play and increases stability.
  • Low-Maintenance: No coating required; naturally corrosion resistant.

Common Applications

  • Deck hardware
  • Outdoor enclosures
  • Furniture and fixtures
  • Light marine structures
  • HVAC mounting

Installation Tips

  • Use with same-grade stainless bolts to avoid galvanic corrosion.
  • Install flat to ensure even compression and joint strength.
  • Inspect for proper fit over bolt shaft before tightening.
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× WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects and other reproductive harm. For more information visit: www.P65Warnings.ca.gov.

Customer Reviews

Based on 8 reviews
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M
MICHAEL O'DONNELL
Excellent Quality, On Time and Great Price

Could not find what I needed locally, Fasteners Plus had it and got it to me promptly. Thanks for your excellent service and products.

D
Don Cordell Ward
Bat House Latch

All of the hardware we use is 316 Marine Grade Stainless Steel. Our bird homes and bat houses are exposed to the elements 24-7 year round. Some are placed on coastal properties where salt air is hard on metals. We bought and have previously bought some of our supplies from these folks. They’ve always been friendly and professional with us.

P
Patrick Heffernan
Great service

All items arrived in good condition and as promised - with the exception of one through-bolt which had "escaped" the packaging (through a hole in the cardboard box). I called customer service and they shipped out a replacement the same day and we received it (well packaged) in no time, so without impact on our timeline. Definitely an easy and no hassle experience.

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    Our multiple distribution centers allow us to reach nearly 80% of the U.S. within 1-2 business days for all in-stock items. With thousands of items in stock & ready to ship, orders placed before 4:00pm CST ship out the same day.

  •

    Our Iowa-based 23,000 square foot manufacturing facility was carefully crafted for the high quality, custom production of tie-down straps and chains, lifting slings, cargo nets, and more. Your vision brought to life.

  •

    As employee-owners, we take customer service very seriously. Our team members are dedicated, professionally-trained, and have decades of combined experience serving the industry. Always speak with a real person and never wait more than 1 business day.