Best M12 Flat Washers in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
* 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 |
|---|---|---|---|---|
| HELIFOUNER | 9.88 | ✅ | ✅ | ✅ |
【Size】12 sizes 300 pieces copper washers assortment kit, include M5 M6 M8 M10 M12 M14 M16 M20, different sizes can meet your different needs.
【Material】 All flat washers are made of copper, have a tighter seal and high heat resistance than steel and rubber washers. Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
【Functions】Used with nuts and bolts and provide a greater bearing surface to prevent the nut or bolt head tearing through the fastened material, flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through.
【Wide Applications】 Widely used for sump plugs, automotive brake lines, fuel, oil lines, hydraulic accessories, water. A sump plug washer set fit all types of engines, such as generators, marine, cars, machinery and factory.
【Package Include】 It contains 300 pieces/12 sizes of the most commonly used copper flat washers, all copper washers are packed in a sturdy convenient case which can be use for a storage box.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 900 pieces/9 sizes of the most commonly used black zinc washers, flat washers, metal washers in a plastic case, different size can satisfy your different needs.
【Design】Flat washers, metric washers, metal washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【Material】Black zinc plated steel, which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
【Package Included】900 pieces 9 sizes in total, package in a durable transparent box with label. It is easy to distinguish the size of the product, you can choose the suitable one to meet all your needs.
【Wide Applications】Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M3 M4 M5 M6 M8 M10 M12, total 240 pieces/15 sizes of the most commonly used stainless steel washers in a plastic case, different size can satisfy your different needs.
【Design】Flat washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【Material】304 Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
【Weak Magnetic】The magnetic properties of 304 stainless steel due to the structure transformation reasons are not at the same level as the magnetic properties of stainless steel of other materials, which means that the magnetic properties of 304 steel always show weak magnetic properties.
【Wide Applications】Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 600 pieces/9 sizes of the most commonly used stainless steel washers in a plastic case, different size can satisfy your different needs.
【Design】Flat washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【Material】304Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
【Weak Magnetic】The magnetic properties of 304 stainless steel due to the structure transformation reasons are not at the same level as the magnetic properties of stainless steel of other materials, which means that the magnetic properties of 304 steel always show weak magnetic properties.
【Wide Applications】Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 800 pieces/9 sizes of the most commonly used nylon washers in a plastic case, different size can satisfy your different needs.
【Material】Made of high quality nylon material which is corrosion-resistant, high hardness, non-polluting, high temperature resistant, and not easy to rust during use, you can use it with confidence.
【Design】Nylon flat washers are mainly used to reduces friction between the fasteners, prevents leakage, isolates, prevents loosening or dispersion pressure. Nylon material with corrosion resistance, wear-resisting to ensure life-time use.
【Package Included】800 pieces 9 sizes black nylon flat washers in total, packed in a durable transparent box with label. It is easy to distinguish the size of the product, you can choose the suitable one to meet all your needs.
【Wide Applications】Widely used in automotive or electrical connections on household and commercial appliances. Whenever you need us, please free to contact us, we will give you a professional service and reply you within 24 hours.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10, total 600 pieces/8 sizes of the most commonly used nylon washers in a plastic case, different size can satisfy your different needs.
【Material】Made of high quality nylon material which is corrosion-resistant, high hardness, non-polluting, high temperature resistant, and not easy to rust during use, you can use it with confidence.
【Design】Nylon flat washers are mainly used to reduces friction between the fasteners, prevents leakage, isolates, prevents loosening or dispersion pressure. Nylon material with corrosion resistance, wear-resisting to ensure life-time use.
【Package Included】600 pieces 8 sizes black nylon flat washers in total, packed in a durable transparent box with label. It is easy to distinguish the size of the product, you can choose the suitable one to meet all your needs.
【Wide Applications】Widely used in automotive or electrical connections on household and commercial appliances. Whenever you need us, please free to contact us, we will give you a professional service and reply you within 24 hours.
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Helifouner | 6 |
We've carried out a comprehensive analysis of 1,731 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 $13.72, 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 6 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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