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 |
|---|---|---|---|---|
| Sutemribor | 9.87 | ✅ | ✅ | ✅ |
√ SIZES - M6 M8 M10 M12 M14 M16 M18 M20
√ PACKAGE - 150pcs ,8 Sizes of the most commonly used flat copper washers in a case
√ COPPER Material - Flat Washers made of copper, have a tighter seal and high heat resistance than steel and rubber washers.
√ FEATURE - All products are made of Copper. Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
√ WIDE APPLICATION - Perfect for Electrical Connections on Household and Commercial Appliances, Automotive and Marine Uses in Which the Power Source Has a Threaded / Bolt-type Connection
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| DYWISHKEY | 9.86 | ✅ | ✅ | ✅ |
√ Size:M6 M8 M10 M12 M14 M16 M18 M20
√ Material: Copper, high conductivity, corrosion resistant
√ Quantity: It contains 150pcs/8 Sizes of the most commonly used copper washers
√ High conductivity, corrosion resistant copper washer assortment, great for sump plugs, water, fuel and hydraulic fittings
√ Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Connectors & Wire & Tools | 9.90 | ✅ | ✅ | ✅ |
『High Quality Meterial』: All the flat washers are made of copper, which with high conductivity, corrosion resistant. They have a tighter seal and high heat resistance than steel and rubber washers
『Good Performance』: These most commonly used copper washers have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using and prolong screws lifespan, great for sump plugs, water, fuel and hydraulic fittings
『Easy to Use』: They are very easy to install, the washer's surface are smooth can reduces friction between the screw and nut, prevents leakage, isolates, prevents loosening or dispersion pressure
『Perfect Package』: In this set, It include 165Pcs metric flat washers of M6*10*1x35pcs, M8*13*1x30pcs, M10*14*1x25pcs, M12*16*1x15pcs, M14*18*1x15pcs, M16*22*1.5x15pcs, M18*24*1.5x15pcs, M20*26*1.5x15pcs for your use
『Wide Application』: High quality copper flat washers with high conductivity perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Swpeet | 9.86 | ✅ | ✅ | ✅ |
❤ 1, HIGH QUALITY MATERIAL ---- High quality pure copper material, fine workmanship, smooth surface, no burr, durable, long service life, not easy to damage, the material itself luster can be preserved for 10 years and 20 years as new.
❤ 2, WIDE APPLICATION ---- Perfect for Electrical Connections on Household and Commercial Appliances, Automotive and Marine Uses in Which the Power Source Has a Threaded / Bolt-type Connection
❤ 3, EASY TO USE ---- Sturdy and durable, great corrosion resistance for outside applications, easy to install. Flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through
❤ 4, SAFETY MATERIAL ---- Copper Washers is a kind of material with high stability and low maintenance. It is environmentally friendly, safe to use, easy to process and highly corrosive. And it is not limited by the processing temperature. Flat Washers made of copper, have a tighter seal and high heat resistance than steel and rubber washers.
❤ 5, GREAT VALUE ---- Copper materials are not easy to rust and have strong antioxidant capacity. You will get 165Pcs Copper Metric Sealing Washers, Including M6 x 10 x 1mm: 35Pcs; M8 x 13 x 1mm: 30Pcs; M10 x 14 x 1mm: 25Pcs; M12 x 16 x 1mm: 15Pcs; M14 x 18 x 1mm: 15Pcs; M16 x 22 x 1.5mm: 15Pcs; M18 x 24 x 1.5mm: 15Pcs; M20 x 26 x 1.5mm: 15Pcs. These can meet all your needs.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BUSY-CORNER | 9.91 | ✅ | ✅ | ✅ |
✔【VARIOUS SIZES】Aluminum Washers that comes in 18 Sizes: M6 M8 M10 M12 M14 M16 M18 M22 M24. Each box contains a total of 508 different washers for your infinite amount of use.
✔【WIDE APPLICATIONS】Perfect for electrical connections on household and commercial appliances, automotive, electrical applications and marine uses in which the power source has a threaded/bolt-type connection. Such as oil lines, hydraulic fittings, oil drain.
✔【ALUMINUM MATERIAL】 Busy-Corner Oil Drain Plugs have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They are durable for use and have a tighter seal than rubber washers
✔【PACKING】It is easy to distinguish the size of the product, It's easy to find correct oil plug gasket quickly, saves your time of running around looking for a particular size.
✔【CUSTOMER SERVICE】You are unhappy for any reason,return your kit with no questions asked and BUSY-CORNER Store will provide a full refund.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| qinlusm | 0.00 | ❌ | ❌ | ❌ |
Wide Range Of Uses: Flat washers are commonly used to prevent nuts from loosening, be compatible with screws, and be suitable for interior decoration, outdoor construction, electrical repair, and furniture repair.
Functions: Flat washers are mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure. High quality and durable to ensure life-time use.
Brass Copper Sealing Boat Crush Washer Flat Gasket Ring Sump Plug 0.5mm
M11 M12 M13 M14 M15 M16 M17 M18 M20 M22 M40 M50
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Busy-Corner | 1 |
| Dywishkey | 1 |
| Glarks | 1 |
| Sutemribor | 1 |
| Swpeet | 1 |
| Zinoe | 1 |
We've carried out a comprehensive analysis of 1,625 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 $12.50, 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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