Best M12 Flat Washers in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
![[20 Pack] 1/2" x 1-1/2" OD Stainless Steel Fender Washer - Choose Size Metal Flat Washers for Bolts (304 Stainless Steel)](https://m.media-amazon.com/images/I/41SiUASXd5L._AC_SL500_.jpg)
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Bolt Dropper | 9.93 | ✅ | ✅ | ✅ |
【High Quality Stainless】This Fender Washer is made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other hardware on the market today.
【Washers That You Can Depend On】Our hardware is very strong and great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
【Great To Keep Around】Bolt Dropper finish washers are great to have around for use in wood and wet environments. Bolt Dropper hardware is the highest quality available on the market and we stand by our claim 100%. Our hardware is strong, corrosion resistant and will support all of your projects.
【Dimensions】For 1/4" Screws/Bolts | Inside Diameter: 0.281" | Outside Diameter: 1.000" | Thickness: 0.050" | Quantity: 100 | Finish: Plain | Material: 18-8 (304) Stainless Steel.
【Lifetime Guarantee】We are so confident that our stainless steel washer product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Bolt Dropper | 9.88 | ✅ | ✅ | ✅ |
【High Quality Stainless】This Fender Washer is made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other hardware on the market today.
【Washers That You Can Depend On】Our hardware is very strong and great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
【Great To Keep Around】Bolt Dropper finish washers are great to have around for use in wood and wet environments. Bolt Dropper hardware is the highest quality available on the market and we stand by our claim 100%. Our hardware is strong, corrosion resistant and will support all of your projects.
【Lifetime Guarantee】We are so confident that our stainless steel washer product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Shkiby Inc | 9.91 | ✅ | ✅ | ✅ |
DIMENSIONS: Inside Diameter: 1/2 Inch | Outside Diameter: 1-1/2" | Thickness: 0.060" | Quantity: 20 | Material: 304 Stainless Steel.
WASHERS THAT YOU CAN DEPEND ON: Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
HIGH QUALITY STAINLESS: SHKIBY 20 Piece Fender Washers are 100% 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant steel, making it last longer than other hardware on the market today.
GREAT TO KEEP AROUND: SHKIBY hardware is great to have around for use in wood and wet environments. SHKIBY washers are the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion resistant and will support all of your projects.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Shkiby Inc | 9.91 | ✅ | ✅ | ✅ |
NOTE: Please make sure you are purchase from SHKIBY INC. DIMENSIONS: Inside Diameter: 1/4 Inch | Outside Diameter: 1-1/4" | Thickness: 0.050" | Quantity: 40 | Material: 18-8 (304) Stainless Steel.
WASHERS THAT YOU CAN DEPEND ON: Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
HIGH QUALITY STAINLESS: SHKIBY 40 Piece Fender Washers are 100% 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant steel, making it last longer than other hardware on the market today.
GREAT TO KEEP AROUND: SHKIBY hardware is great to have around for use in wood and wet environments. SHKIBY washers are the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion resistant and will support all of your projects.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| ❌ | ❌ | ❌ |
DIMENSIONS: Inside Diameter: 1/4 inch Outside Diameter: 1/2" Nominal Thickness| Quantity: 100 pcs | Material: 18-8 (304) Stainless Steel
HIGH QUALITY STAINLESS: These 100pcs Flat washer 1/4" ID are 100% 18-8 (304) Stainless Steel which are one of the highest forms of corrosion resistant steel, making it last longer than other hardware on the market today.
WASHERS THAT YOU CAN DEPEND ON: Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
GREAT TO KEEP AROUND: Persberg hardware is great to have around for use in wood and wet environments. Persberg Washers are the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion resistant and will support all of your projects.
LIFETIME GUARANTEE: Try our product Kit with NO risk and 100% money-back guarantee – NO questions asked!
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| RuiLing | 9.83 | ✅ | ✅ | ✅ |
Made of high-quality 304 stainless steel, durable and long service life.
The shiny washer makes the screw recessed in the center, giving a clean, decorative appearance, not easy to slide, and more convenient and quick to use.
The smooth washer is designed to accommodate the head of a countersunk screw to provide a finished appearance. The compact and portable design will bring you more convenience and speed.
The washing machine is great to have use in wood and humid environments. Washers are usually used where a larger outer diameter is required to increase the bearing surface and reduce the surface load.
Package Included:100PCS No. 8 countersunk washers. Washers are suitable for flat head or oval head screws.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Dreneco | 5.13 | ❌ | ❌ | ❌ |
Material: Durable 304 stainless steel.Compared with normal stainless steel,it's safer, more durable,non-toxic and corrosion resistant.It is of high hardness and not easy to deform.It can be used in outdoor humid environment.
Fastener Type: Bevel Washer
Features: Bevel washer can Resist loosening caused by vibration and corrosion.Helps to distribute loads of bolts, screws and nuts uniformly.
Usage: Intended for the general use under the head of a bolt or nut.Widely used in slot section.
Wide Application: Square Oblique Washer can be used for many industries and for many different exterior applications.Often used in timber construction, since they develop more friction when tightened against wood. They are also suitable for a variety of applications where a heavy washer is required.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Suprwin | 9.39 | ✅ | ✅ | ✅ |
【Solid STAINLESS STEEL】Made of high quality stainless Steel. Made of corrosion resistant metals, has good corrosion resistance, heat resistance, low temperature strength, making it last longer than other hardware on the market today.
【MULTIPLE Purpose】Square plate washers are often used in timber construction since they develop more friction when tightened against wood. They are also suitable for a variety of applications where a heavy washer is required. It can be used on multiple platforms and facets. Designed to be used in conjunction with carriage bolts for the securing of roof trusses but can also be used in a variety of ways on many different projects
【Package】Inside Diameter: 1/2" | Outside Diameter: 2"*2" | Thickness:1/8"" | Quantity: 50pcs | Material: Stainless Steel.
【Widely Application】 Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
【LIFETIME WARRANTY】 - 100% Satisfaction Guarantee: If you have any problems we will replace them free of charge or issue a full refund! We are so confident that our product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Bolt Dropper | 9.88 | ✅ | ✅ | ✅ |
【High Quality Stainless】This Fender Washer is made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other hardware on the market today.
【Washers That You Can Depend On】Our hardware is very strong and great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
【Great To Keep Around】Bolt Dropper finish washers are great to have around for use in wood and wet environments. Bolt Dropper hardware is the highest quality available on the market and we stand by our claim 100%. Our hardware is strong, corrosion resistant and will support all of your projects.
【Dimensions】For #10 Screws/Bolts | Inside Diameter: 0.219" | Outside Diameter: 1.000" | Thickness: 0.050" | Quantity: 100 | Finish: Plain | Material: 18-8 (304) Stainless Steel.
【Lifetime Guarantee】We are so confident that our stainless steel washer product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Bolt Dropper | 9.88 | ✅ | ✅ | ✅ |
【High Quality Stainless】This Fender Washer is made of 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other hardware on the market today.
【Washers That You Can Depend On】Our hardware is very strong and great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.
【Great To Keep Around】Bolt Dropper finish washers are great to have around for use in wood and wet environments. Bolt Dropper hardware is the highest quality available on the market and we stand by our claim 100%. Our hardware is strong, corrosion resistant and will support all of your projects.
【Dimensions】For 3/8" Screws/Bolts | Inside Diameter: 0.406" | Outside Diameter: 1.500" | Thickness: 0.050" | Quantity: 100 | Finish: Plain | Material: 18-8 (304) Stainless Steel.
【Lifetime Guarantee】We are so confident that our stainless steel washer product is the best on the market that we offer a NO HASSLE LIFETIME GUARANTEE.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.87 | ✅ | ✅ | ✅ |
Product Name: Square Washer; Fit Screw/Bolt Thread Diameter: M3(#5); Inside Diameter: 13.2mm / 0.52"; Outside Size: 40 x 40 x 4mm / 1.57" x 1.57" x 0.16"(L*W*T); Package Content: 2pcs x Square Washers
Material: Square plate washers are made of 304 stainless steel, rust and corrosion-resistant, with good heat and low temperature strength, suitable for indoor and outdoor use.
Advantages: Square washers provide more contact area for fasteners, it is a good choice for applications requiring higher carrying capacity, provide greater stability and prevent loosening.
Application: Square washers fit into slots and channels and have flat sides to keep them from rotating, commonly used in mechanical equipment and wood construction, where they create more friction when tightening the wood and are used to fix bolts, screws and other fasteners. Such as use with carriage bolts to secure roof trusses. Widely used in construction, plumbing, electrical, automotive and other industries, etc.
Note: When purchasing a square washer, you need to determine the correct size, thickness, and material for your intended application. These factors can greatly affect the performance and durability of the washer.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Partstock | 9.85 | ✅ | ✅ | ✅ |
Material:Made of high quality 304 Stainless Steel,corrosion resistant, sturdy and durable.
Shiny stainless washer that allows the screw to recess into the center giving a clean, decorative presentation.
Finish washers are designed to accommodate the heads of a countersunk screw in order to provide a finished appearance.
Washers are great to have around for use in wood and wet environments.Washers are usually used where larger outside diameters are required to increase the bearing surface and reduce the surface load.
Package included: 100pcs #8 Countersunk Washers.The washer is designed for flat head or oval head screws.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.87 | ✅ | ✅ | ✅ |
Product Name: Square Washer; Fit Screw/Bolt Thread Diameter: M4(#8); Inside Diameter: 4.5mm / 0.18"; Outside Size: 20 x 20 x 1mm / 0.79" x 0.79" x 0.04"(L*W*T); Package Content: 20pcs x Square Washers
Material: Square plate washers are made of 304 stainless steel, rust and corrosion-resistant, with good heat and low temperature strength, suitable for indoor and outdoor use.
Advantages: Square washers provide more contact area for fasteners, it is a good choice for applications requiring higher carrying capacity, provide greater stability and prevent loosening.
Application: Square washers fit into slots and channels and have flat sides to keep them from rotating, commonly used in mechanical equipment and wood construction, where they create more friction when tightening the wood and are used to fix bolts, screws and other fasteners. Such as use with carriage bolts to secure roof trusses. Widely used in construction, plumbing, electrical, automotive and other industries, etc.
Note: When purchasing a square washer, you need to determine the correct size, thickness, and material for your intended application. These factors can greatly affect the performance and durability of the washer.
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Bolt Dropper | 4 |
| Shkiby | 2 |
| Uxcell | 2 |
| Dreneco | 1 |
| Persberg | 1 |
| Rlecs | 1 |
| Suprwin | 1 |
| Taodan | 1 |
We've carried out a comprehensive analysis of 6,479 reviews on flat washers, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select flat washers priced around $14.29, with top brands including wensilon, ylyl, hardlad, lupanter, kindroufly and marine bolt supply and small parts
Our team of expert editors reviewed these high-quality items and handpicked the top 13 flat washers for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include wensilong, ylyl direct, faiq ahmed, lupanter hardware store, kindroufly and marine bolt supply and amazon.com .
We are dedicated to assisting our users in finding the right washers Products based on their needs, saving them considerable time when choosing which flat washers to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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![[20 Pack] 1/2" X 1-1/2" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts (304 Stainless Steel) #TOP3](https://m.media-amazon.com/images/I/41SiUASXd5L._SL500_.jpg)
![[20 Pack] 1/2" X 1-1/2" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts (304 Stainless Steel) #TOP1](https://m.media-amazon.com/images/I/3177BiDj+TL._SL500_.jpg)
![[20 Pack] 1/2" X 1-1/2" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts (304 Stainless Steel) #TOP2](https://m.media-amazon.com/images/I/311Zim00EZL._SL500_.jpg)
![[20 Pack] 1/2" X 1-1/2" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts (304 Stainless Steel) #TOP3](https://m.media-amazon.com/images/I/411o-xFFv3L._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP4](https://m.media-amazon.com/images/I/31v1ywwetzS._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP1](https://m.media-amazon.com/images/I/412uR6toSHL._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP2](https://m.media-amazon.com/images/I/31ocbbvI8BL._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP3](https://m.media-amazon.com/images/I/41OiAhZJ54L._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP4](https://m.media-amazon.com/images/I/41d8Aezvq9L._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP5](https://m.media-amazon.com/images/I/318Tp1o52DL._SL500_.jpg)
![[40 Pack] 1/4" X 1-1/4" Od Stainless Steel Fender Washer - Choose Size Metal Flat Washers For Bolts, 18-8 (304) Stainless Steel #TOP6](https://m.media-amazon.com/images/I/31Wu09ZoXoL._SL500_.jpg)
