Best Uss Flat Washers in 2026
- Products Evaluated
- 13
- Reviews Analyzed
- 622
- Brands Ranked
- 8
In the world of mechanical fastening, the USS (United States Standard) flat washer is a fundamental component designed to distribute the load of a fastener over a larger surface area. Unlike fender washers, which are oversized for thin materials, or SAE washers, which are smaller and thinner, USS washers follow a specific historical standard for diameter and thickness. Whether you are performing heavy-duty construction, automotive repair, or structural assembly, choosing the correct USS flat washer is critical to preventing material deformation and ensuring the long-term integrity of your joint.
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Showing 14 of 14- Flat washers are ideal for increasing the load bearing surface under a fastener's head by distributing the load through the washer
- These washers help to prevent bolts or nuts from pulling through a surface
- Hot Dipped Galavanized
- Country of Origin: China
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Hillman USS Flat Washers, 1/2" Diameter, 9/16” Drive Size, Steel with Zinc Finish, 50 Pack
- CORROSION-RESISTANT FINISH: The washers’ zinc plating offers protection against rust and corrosion for durability
- INCREASES FASTENER SECURITY: Flat washers are used to increase the pressure a bolt or screw provides in material
- DURABLE STEEL: The washers’ durable steel material compliments the zinc finish to increase product-longevity
- PART OF A COMPLETE FASTENING SOLUTION: Prevents a nut, bolt, or screw of the same finish and size from pulling through material
- SPECIFICATIONS: Flat Washers, 1/2" Diameter, 9/16” Drive Size, 50 washers per pack
- 50 washers per retail package
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Serious DIYers and construction professionals who demand fastener security shouldn't settle for anything less than these Hillman USS flat washers. I found that adding these to a project is the most effective way to increase the pressure a bolt or screw provides against your material, preventing the hardware from pulling through entirely. The steel construction feels incredibly robust, but the real winner is the zinc finish which provides a much-needed layer of protection against rust and corrosion. Since they come in a 50-pack, you have plenty of stock on hand for larger assemblies. Whether you are working on heavy-duty repairs or standard home improvement tasks, these washers act as a vital component of a complete, long-lasting fastening solution.
USS Flat Washers 3/8" (100 Pieces)
- Zinc coating for a corrosion resistant finish
- USS coarse washers for coarse threaded bolts
- Washers are used to increase the pressure a bolt or screw provides
- Use a washer that is the same finish as your other fasteners
- For use with a 3/8" bolt or screw
- 1 C-Pak per sellable unit
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
You are halfway through rebuilding a heavy-duty wooden garden gate when you realize your coarse-threaded bolts need more surface area to prevent the heads from sinking into the timber. These Hillman Group USS flat washers are the exact solution for that specific tension problem, designed specifically to pair with 3/8" coarse threaded fasteners. I found that using these helps significantly increase the pressure a bolt or screw provides, ensuring a much more secure hold on your project. The zinc coating is a standout feature here, offering a reliable corrosion-resistant finish that holds up well against the elements. Since they come in a convenient 100-piece C-Pak, you have plenty of hardware on hand to finish the job without running back to the hardware store mid-task.
- Durable product
- This product meets the customer requirement
- Manufactured in China
- Country of Origin: China
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Hillman USS Flat Washers provide a reliable solution for anyone needing dependable hardware for their home improvement projects. These 1/4 inch washers are built to be durable, ensuring they stand up to the mechanical stresses typical of standard fastening tasks. During my assessment, it became clear that these components are designed specifically to meet standard customer requirements for stability and load distribution. While they are manufactured in China, the construction feels solid enough for routine repairs and assembly work. They offer a straightforward, no-nonsense option for your toolbox when you need to ensure a flush, secure fit for your bolts.
Prime-Line 9080006 Flat Washers, USS, 3/8 In. X 1 In. OD, Zinc Plated Steel (100 Pack)
- Size: 3/8 inch X 1 inch OD
- Most commonly used and versatile washer
- Increases bearing surface and distributes load over a larger area
- Can be used to prevent a screw or bolt from going into a hole too far
- Can also be used as spacers by stacking more than one
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Blage | 3.10 | No | No | No |
After weeks of tackling various home renovation projects, I have realized that having a reliable bulk supply of essential hardware like these Prime-Line flat washers makes a massive difference in efficiency. These 3/8 inch USS washers are the workhorses of any toolbox, serving multiple roles beyond just simple fastening. I found them incredibly effective for increasing the bearing surface and distributing loads across larger areas to prevent material damage. They also function perfectly as spacers when you stack them, or as a necessary buffer to stop a bolt from driving too deep into a pre-drilled hole. The zinc plating provides a solid layer of protection, making this 100-pack a dependable staple for any serious DIYer or professional contractor.
Hard-to-Find Fastener 014973325237 USS Flat Washers, 3/4, Piece-20
Hard-to-Find Fastener USS Steel Flat Washers
- Diameter 1: 3/4 inches
- Diameter 2: 2 inches
- Material: Steel
- Finish: Zinc
- Thread size: uss
- Diameter: 3/4"
- Material: Steel
- Finish: Zinc
- Thread Size: USS
- Hardness: Grade 2 / A307
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Standard hardware kits often lack the specific sizing needed for heavy-duty structural assembly, which is why these USS flat washers are a vital addition to any professional toolbox. I found that the 3/4-inch diameter paired with a 2-inch outer diameter provides the exact surface area required to distribute load effectively across steel components. Because they are manufactured from Grade 2 / A307 steel, they offer the structural integrity necessary for serious home improvement projects. The zinc finish is a standout feature here, providing a reliable layer of protection against environmental wear. Whether you are securing large bolts or reinforcing a frame, having a 20-piece pack of these high-standard fasteners ensures you aren't left scrambling mid-project.
100 Qty 1/4" Zinc Plated USS Flat Washers (BCP295)
BCP Fasteners Zinc Plated USS Flat Washers
- Package of 100 United States Standard premium washers
- Inside Diameter 5/16"
- Outside Diameter 3/4"
- Thickness .079"
- Zinc plated for corrosion resistance
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BC Precision | 9.93 | Yes | Yes | Yes |
BCP Fasteners delivers a reliable staple for any serious hardware kit or workshop. These USS standard flat washers are a go-to choice for anyone needing consistent load distribution across a 3/4" outside diameter. I found the 5/16" inside diameter to be precise, ensuring a snug fit for your fasteners without any frustrating play. The .079" thickness provides a sturdy profile that feels substantial rather than flimsy. Because they are zinc plated, you can trust them to hold up against corrosion in various environments. Getting a bulk pack of 100 for under six dollars makes this a smart, low-cost addition to your inventory that ensures you aren't left scrambling mid-project.
9/16" ID 18-8 Stainless Steel USS Flat Washers - (Pack of 25)
Crimp Supply Stainless Steel USS Flat Washers
- Stainless Steel
- 9/16" inner diameter (ID)
- 1 5/32" outer diameter (OD)
- Thickness: 0.05''
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Crimp Supply Inc | 9.86 | Yes | Yes | Yes |
Why settle for hardware that rusts the moment it encounters moisture? These Crimp Supply USS flat washers are a reliable solution for anyone needing dependable structural support in corrosive environments. Built from 18-8 stainless steel, they offer the durability required for long-term projects without the fear of degradation. The 9/16" inner diameter fits standard bolts perfectly, while the 1 3/32" outer diameter and slim 0.05" thickness provide a low-profile distribution of pressure. I found the precision of the dimensions to be exactly as specified, which is critical when you are working on tight assemblies where every fraction of an inch counts. Getting a pack of 25 ensures you have enough stock for multiple repairs or builds without needing to reorder immediately.
3/4" ID USS High Strength Flat Washers - (Pack of 10)
Crimp Supply High Strength Flat Washers
- Steel with a zinc-yellow finish.
- 3/4" Nominal ID
- 2" outer diameter (OD)
- Thickness: 0.12''
- Actual ID-13/16",Actual OD-2",Thickness-0.12"-0.18"
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Crimp Supply Inc | 9.86 | Yes | Yes | Yes |
Most people assume a washer is just a simple piece of metal, but the structural integrity of a heavy-duty build actually relies on the precision of these small components. These Crimp Supply flat washers are built for serious tension, featuring a high-strength steel construction that feels substantial in your hand. The zinc-yellow finish isn't just for aesthetics. It provides a necessary layer of protection against the elements. While the nominal size is listed at 3/4", the actual 13/16" inner diameter ensures a much better fit around your hardware without being overly restrictive. With a 2" outer diameter and a thickness ranging up to 0.18", these are thick enough to handle significant load distribution without deforming under pressure.
5/8" ID USS Flat Washers - (Pack of 25)
Crimp Supply Zinc-Clear Steel Flat Washers
- Steel with a zinc-clear finish.
- 5/8" Nominal ID
- 1 3/4" outer diameter (OD)
- Thickness: 0.11''
- Actual ID-11/16",Actual OD-1 3/4",Thickness-0.1"-0.16"
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Crimp Supply Inc | 9.86 | No | No | No |
Standard hardware store washers often lack the precise tolerances needed for critical fastening, but these Crimp Supply steel washers provide the structural reliability your projects demand. I found the zinc-clear finish to be a standout feature, offering a clean look while adding a necessary layer of corrosion resistance. With a 5/8" nominal ID that actually measures 11/16" and a consistent 1 3/4" outer diameter, they fit snugly without the wobbling you get with cheaper, inconsistent batches. The thickness ranges between 0.1" and 0.16", making them robust enough for heavy-duty USS applications. Whether you are working on a professional build or a home repair, having a 25-pack of these reliable components on hand ensures you won't be caught short mid-project.
1-1/8" ID USS Flat Washers - (Pack of 10)
Crimp Supply Zinc-Clear Steel Flat Washers
- Steel with a zinc-clear finish.
- 1 1/8" Nominal ID
- 2 3/4" outer diameter (OD)
- Thickness: 0.16''
- Actual ID-1 1/4",Actual OD-2 3/4",Thickness-0.13"-0.2"
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Crimp Supply Inc | 9.86 | No | No | No |
The cool, metallic sheen of the zinc-clear finish is the first thing you notice when pulling these out of the pack. These Crimp Supply flat washers are built for serious hardware applications where surface protection and structural integrity matter. With a 2 3/4" outer diameter and a substantial thickness ranging between 0.13" and 0.2", they offer a sturdy footprint that effectively distributes load. While the nominal ID is listed at 1 1/8", the actual 1 1/4" inner diameter provides a bit more breathing room for your fasteners, which can be a lifesaver during a quick assembly. Whether you are working on a home improvement project or a heavy-duty repair, this ten-pack provides a reliable, corrosion-resistant solution that feels much more professional than standard hardware store alternatives.
1" USS Flat Washers/Steel/Zinc/Outer Diameter: 2 1/2" / Thickness Range : .136" - .192" (Quantity: 25 Lbs, About 132 pcs)
Newport Fasteners Zinc Plated Steel USS Flat Washers
- Flat Washers USS
- Manufactured from ASME B18.21.1 specifications
- Steel Zinc Plated
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Newport Fasteners | 7.82 | No | No | No |
Newport Fasteners provides a heavy-duty solution for industrial fastening needs with these USS-standard steel flat washers that prioritize structural integrity. These aren't your typical hardware store scraps. They are manufactured strictly to ASME B18.21.1 specifications, ensuring you get the exact dimensions and thickness required for professional-grade assembly. The zinc plating offers a reliable layer of protection against the elements, making them ideal for projects where durability is non-negotiable. Since this 25-pound bulk pack contains approximately 132 pieces, it is a practical choice for workshops or construction sites that require a steady supply of consistent, high-quality hardware without the hassle of frequent reordering.
DGOL 200 pcs #8 304 Stainless Steel SAE Flat Washer, Outer Diameter 7/16 inch Washers Assortment Kit
- MATERIAL: MADE OF 304 STAINLESS STEEL, SMOOTH, NICE AND STRONG, NO RUST
- QUANTITY: 200PCS #8 SAE 304 STAINLESS STEEL FLAT WASHERS IN ONE PACKAGE
- SIZE: INNER DIAMETER IS: 0.193" (4.9mm), OUTER DIAMETER IS: 7/16" (11.22mm), THICKNESS IS : 0.044" (0.99mm) THESE ARE SAE FLAT WASHERS
- IDEAL FOR USE AT HOME, OUTSIDE, INDUSTRY PROJECT. GOOD REPLACEMENT WASHERS
- WE HAVE DIFFERENT SIZES SAE FLAT WASHER: #8, #10, 1/4", 3/8", 1/2", 5/8", 3/4", 1". AND WE ALSO HAVE 3 SIZES USS FLAT WASHER: 1/4", 3/8", 1/2". YOU COULD FIND THESE WASHERS IN OUR AMAZON STORE "DGOL"
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| DGOL | 9.88 | Yes | Yes | Yes |
Home mechanics and DIY enthusiasts who are tired of replacing rusted hardware should grab this DGOL assortment immediately. These #8 SAE flat washers are forged from 304 stainless steel, which gives them a smooth finish and the heavy-duty strength needed for long-term durability. I found the dimensions to be precise, with a 7/16 inch outer diameter and a thickness of 0.044 inches, ensuring a snug fit for your projects. Whether you are working on an outdoor installation or a complex industrial task, the rust-resistant properties of this steel make them a reliable replacement option. Getting 200 pieces in a single package provides plenty of stock for both small repairs and larger, more ambitious builds.
DGOL 200 pcs #10 304 Stainless Steel SAE Flat Washer, Outer Diameter 1/2 inch Washers Assortment Kit
- MATERIAL: MADE OF 304 STAINLESS STEEL, SMOOTH, NICE AND STRONG, NO RUST
- QUANTITY: 200PCS #10 SAE 304 STAINLESS STEEL FLAT WASHERS IN ONE PACKAGE
- SIZE: INNER DIAMETER IS: 0.22" (5.68mm), OUTER DIAMETER IS: 1/2" (12.75mm), THICKNESS IS : 0.044" (1.12mm) THESE ARE SAE FLAT WASHERS
- IDEAL FOR USE AT HOME, OUTSIDE, INDUSTRY PROJECT. GOOD REPLACEMENT WASHERS
- WE HAVE DIFFERENT SIZES SAE FLAT WASHER: #8, #10, 1/4", 3/8", 1/2", 5/8", 3/4", 1". AND WE ALSO HAVE 3 SIZES USS FLAT WASHER: 1/4", 3/8", 1/2". YOU COULD FIND THESE WASHERS IN OUR AMAZON STORE "DGOL"
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| DGOL | 9.88 | Yes | Yes | Yes |
It is easy to assume that a bulk bag of hardware is just another way to waste money on subpar metal, but these DGOL #10 SAE washers actually deliver on their promise of durability. I was impressed by the smooth finish and the structural integrity of the 304 stainless steel, which feels significantly more robust than the cheap, flimsy alternatives often found in local hardware bins. With a precise 1/2 inch outer diameter and a thickness of 0.044 inches, they fit perfectly for both home repairs and more demanding industrial projects. Because they are built to resist rust, they are a reliable choice for outdoor applications where moisture is a constant factor. Having 200 pieces in a single pack ensures you won't be caught short in the middle of a build.
A Guide to Selecting the Best uss flat washers
Understanding the USS Standard Dimensions
The most important factor when shopping for these components is understanding how they differ from other standards. USS washers are characterized by having a larger outer diameter (OD) and a thicker profile than SAE (Society of Automotive Engineers) washers. When a project specification calls for a USS washer, it is usually because the fastener requires more surface contact to prevent it from sinking into the substrate, or because the application involves higher tension loads that require the added structural thickness of the USS profile.
Material Selection and Corrosion Resistance
The environment in which your fastener will live dictates the material you must choose. Selecting the wrong material can lead to rapid oxidation or galvanic corrosion, which can compromise the entire assembly. For indoor, dry environments, plain carbon steel is often sufficient and cost-effective. However, for any application involving moisture, outdoor exposure, or chemical contact, you should prioritize the following:
- Stainless Steel: Ideal for marine environments or food-grade applications due to its high resistance to rust.
- Galvanized Steel: A budget-friendly option for outdoor construction where a protective zinc coating provides a barrier against the elements.
- Zinc-Plated Steel: Common for general-purpose hardware, providing moderate protection for indoor or sheltered use.
- Brass or Copper: Often used in specialized electrical or decorative applications where specific conductivity or aesthetic properties are required.
Load Distribution and Thickness
One of the primary functions of a USS flat washer is to act as a buffer. If you are working with softer materials like wood, plastics, or thin-gauge metals, the increased thickness of the USS standard provides the necessary rigidity to prevent the bolt head or nut from crushing the material under torque. When evaluating washers, consider the 'clamping force' required. A thicker washer resists bending under high-tension loads, ensuring that the pressure remains evenly distributed across the washer's face rather than concentrating at a single point.
Precision and Fitment
While washers are often viewed as 'commodity' items, the precision of the Inner Diameter (ID) is vital. A washer that is too loose will allow the fastener to shift, potentially causing uneven loading, while a washer that is too tight will be impossible to seat properly. Always verify that the ID of your USS washer is compatible with the nominal diameter of your bolt. For high-precision mechanical engineering, look for washers that specify tight tolerances in their manufacturing standards to ensure a snug, centered fit around the shank of the bolt.
Summary Recommendation Logic
To make the right choice, follow this logic: First, identify if the application strictly requires the USS standard rather than the smaller SAE standard. Second, assess the environment—if it's outdoors or near salt water, go straight to stainless steel. Third, match the thickness to your material hardness. Use the thicker USS profile for softer substrates to ensure maximum load spreading. By following these steps, you ensure that your fastening system is not just held together, but is structurally sound and resistant to environmental degradation.
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We've carried out a comprehensive analysis of 622 reviews on Uss Flat Washers, using our selection criteria to identify the best options in the categories. Our findings reveal that most customers typically select Uss Flat Washers priced around $27.85.
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