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This 325-piece copper washer kit offers a comprehensive range of 10 metric sizes (M5-M14) crafted from premium red copper for superior heat resistance, electrical conductivity, and corrosion protection. Designed for flawless sealing and pressure distribution, it comes neatly organized in a portable transparent box with a size chart, making it an indispensable toolkit upgrade for professionals and DIYers across automotive, marine, electrical, and industrial applications.







| ASIN | B0CR8XPH5P |
| Best Sellers Rank | #1,989 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Flat Washers |
| Brand | AKOSN |
| Color | Copper |
| Compatible Groove Diameter | 0.2 inches |
| Customer Reviews | 4.6 out of 5 stars 896 Reviews |
| Exterior Finish | Copper |
| Fastener Size | M5, M6, M8, M10, M12, M14 |
| Fastener Type | Flat Washer |
| Finish Types | Copper |
| Item Diameter | 10 millimeters |
| Item Dimensions | 5.35 x 3.81 x 0.7 inches |
| Item Thickness | 1-1.5 millimeters |
| Manufacturer | AKOSN |
| Material | Copper |
| Material Type | Copper |
| Metal Type | Copper |
| Number Of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 325 |
| Outside Diameter | 9-20 millimeters |
| Part Number | Flat_Washer_001 |
| Screw Head Style | Flat |
| Set Name | Premium Copper Metric Sealing Crush Washers Assortment Kit |
| Size Name | Copper_Washers_325Pcs |
| Thread Size | Metric |
| Unit Count | 1 Count |
| Washer Compatibility | Metric Bolts, Metric Screws |
| Washer Type | Flat |
J**H
Perfect. Options Available at the Ready.
GREAT to have a few difference options on hand. I never know exactly which size I need until I have pulled the car parts apart and cannot put them back together for the want of a two cent washer.
J**P
Worth it
Good assortment works as it should seals right and price was good.
C**H
Good selections, plenty of each size.
A very comprehensive kit, with plenty of each size. Bought to have a stock of washers for my side gig of working on vehicles rather than having to go to the parts store and pay way more for just 1 at a time. The value should pay off in the long run for sure. These seem to be of good quality, and same dimensions as OEM washers of the same type.
M**T
Good qualityโbut limited sizes for hydraulic work
Bought this while sorting out a hydraulic top link setup that used banjo fittings (not my first choice), and this kit definitely came in handy. The copper washers themselves are solidโsoft enough to crush and seal properly, but not so thin that they feel cheap. I used several to clean up leaks on banjo connections, and once torqued, they sealed like they should. You get a good assortment and plenty of quantity, and the case is actually organized wellโnothing dumps out when you open it. Hereโs the catch: * The size range is limited, especially for real hydraulic applications * Works fine for smaller fittings, metric hardware, and light-duty stuff * But donโt expect it to cover larger hydraulic fittingsโyouโll still need bigger washers separately Bottom line: Good kit to have around for general use and smaller banjo fittings, but itโs not a complete solution for hydraulic work. Think of it as a supplement, not a one-and-done kit.
T**D
Great price and quality
I am so glad I bought an assortment.
A**N
Great item to have on hand
Thinner in every dimension than what comes with a new brake caliper, but still works fine.
O**R
325 PCS, 10 Sizes, Premium Copper Metric Sealing Crush Washers Assortment Kit
Good set of copper washer. Most common sizes for drain plugs are in this set. Can't beat the price.
A**.
GOOD PRODUCT
AWESOME
D**N
Quality service
As pictured and quick postage
Trustpilot
2 weeks ago
2 weeks ago