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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: 1 Washer
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 10 reviews
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j
jeff w
Quality parts - good price

Needed some stainless steel fasteners for my gate refresh and the local stores didnt have the correct size and would have been more costly.

W
WILLIAM WAY JR
Excellent!

I purchased a few 7" SS bolts, nuts and washers for them for my boat. The order total was minimal and it was online and my first time using Fasteners Plus, so I wasn't sure when or if I would get them. However.....there were constant email updates from order acceptance to delivery and everything came well packaged and in good form. If my experience is indicative of their usual service, they are top notch and I run an aerospace fastener business for a living.

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.

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    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.

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