SKU: 43390678645

Hillman Hot Dipped Galvanized Steel 5/16 in. USS Flat Washer, 100-Pack

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Description

Hillman Hot Dipped Galvanized Steel 5/16 in. USS Flat Washer, 100-Pack5 16 in. Hot Dip Galvanized USS Flat Washers (100 Pack) These Hillman USS flat washers add load distribution and prevent fasteners from biting into wood or metal. Made of steel with a hot dipped galvanized finish, they deliver reliable corrosion resistance for outdoor and marine projects. Key Features: Corrosion Protection: Hot dipped galvanized steel resists rust in outdoor and marine environments Load Distribution: Flat washer design spreads force

5/16 in. Hot-Dip Galvanized USS Flat Washers (100-Pack)

These Hillman USS flat washers add load distribution and prevent fasteners from biting into wood or metal. Made of steel with a hot-dipped galvanized finish, they deliver reliable corrosion resistance for outdoor and marine projects.


Key Features:

  • Corrosion Protection: Hot-dipped galvanized steel resists rust in outdoor and marine environments
  • Load Distribution: Flat washer design spreads force to protect surfaces and strengthen joints
  • USS Compatibility: Sized for coarse-thread 5/16 in. bolts and screws
  • Bulk Value: 100-pack for jobsite efficiency and replenishment
  • Durable Construction: Steel build maintains clamping force under heavy use

Specifications Table:

Specification Details
Material Steel
Finish Hot Dipped Galvanized
Washer Type Flat
Standard USS (coarse thread compatibility)
Size 5/16 inch
Number in Package 100 pack
Packaging Type Boxed
Inch/Metric Inch

Frequently Asked Questions (FAQ):

Q: What bolt size are these washers for?
A: They are designed for use with 5/16 in. coarse-thread (USS) bolts and screws.


Q: Can these be used outdoors?
A: Yes. The hot-dipped galvanized finish provides strong corrosion resistance suitable for outdoor applications.


Q: Are these metric or inch sized?
A: Inch sized (USS standard).


Q: What is included in the package?
A: A boxed 100-pack of 5/16 in. USS flat washers.


Q: Do these work with fine-thread hardware?
A: They are intended for USS coarse-thread bolts; match washers to the hardware standard you’re using for best results.


Industrial Strength, Effortless Finish

The galvanic sheen of these flat washers brings a refined, utilitarian beauty to exposed hardware moments. Their hot-dipped finish offers a rugged texture that complements raw woods and weathered metals. Style them with blackened bolts on cedar or concrete for a crisp, architectural detail. A small component with big impact—essential for enduring, luxe outdoor installations.


Equip your project with corrosion-resistant confidence—add this 100-pack of Hillman 5/16 in. galvanized flat washers to your cart today.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 43390678645

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Edmond Ilunga Kaninda
Phoenix, US
★★★★★ 5
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Size: 5 Quarts, Size: 5 Quarts
This is the best oil that I ever used.I have used it in my Toyota Noah 2006-2007 model…The engine is as quiet as new…wanted to see how it would perform.It has clocked 3,500km.This is good and have recommended to my friends and family
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Reviewed in the United States on May 23, 2026
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Dawn S.
Los Angeles, US
★★★★★ 5
Top-tier engine protection that runs quiet and smooth
Size: 5 Quarts
I’ve used Castrol EDGE in a couple of our vehicles and always come back to it for consistent performance. It extends the time between oil changes and holds up well under both daily driving and highway mileage. We don't "extend the time" though. It's changed, on the dot, every time. The consistency and quality of the oil's condition at change, though, is easily able to be seen that it would go for much longer. Engine runs quieter, and I’ve noticed better fuel efficiency over time compared to conventional oil. Whether that's how attentively I drive and watch the mileage meter on the dash or the oil - is up for debate ;) It doesn’t burn off as quickly either, which is great if you’re keeping an eye on long-term engine health. The bottle design pours cleanly with a smart spout, which saves unnecessary messes in the garage. Pros: Strong wear protection and long-lasting Improves engine quietness Easy-pour design Tip: Use it with a high-quality oil filter for maximum benefit don’t skimp on either part and you'll be golden.
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Reviewed in the United States on June 26, 2025
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Eric C.
Grantham, US
★★★★★ 5
Excellent choice for long oil change intervals.
Size: 1 Quart, Pack of 6
I'm a former dealership mechanic and for years I used whatever we had in the bulk tank which was usually Valvoline conventional. My last job was at a German car dealership. Castrol was the oil recommended by the German manufacturers and that's when I started using Castrol. In my experience Castrol is an excellent oil. My 2014 Ford just rolled over 242,000 miles and even with factory 10,000 mile oil change intervals, from what I can see through the oil fill the top end of the engine is still clean. I've never had to remove the valve cover. It's using about a quart between oil 10,000 mile oil changes which is great because when it was new it used about a 1/2 quart between changes.
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Reviewed in the United States on January 28, 2026
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Doraiky
Houston, US
★★★★★ 5
Bueno
Size: 5 Quarts
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E.B.
Houston, US
★★★★★ 5
switched from Mobil 1
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