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🔩 Seal the deal with copper confidence!
The AKOSN Copper Flat Washer Assortment Set offers 325 premium red copper washers in 10 metric sizes, designed for superior heat resistance, corrosion protection, and secure sealing. Packaged in a durable, transparent case with a detailed size chart, this set is ideal for professionals and DIYers seeking reliable, versatile washers for automotive, industrial, and household projects.







| ASIN | B0CR8XPH5P |
| Best Sellers Rank | 1,266,518 in DIY & Tools ( See Top 100 in DIY & Tools ) 7,577 in Washers |
| Brand Name | AKOSN |
| Compatible Groove Diameter | 0.2 Inches |
| Customer Reviews | 4.6 out of 5 stars 841 Reviews |
| Exterior Finish | Copper |
| Exterior finish | Copper |
| Fastener Size | M20 |
| Fastener Type | Flat Washer |
| Fastener size | M20 |
| Finish Types | Copper |
| Item Dimensions | 13.6 x 9.7 x 1.8 centimetres |
| Item Thickness | 1-1.5 Millimetres |
| Item thickness | 1-1.5 Millimetres |
| Manufacturer | AKOSN |
| Manufacturer Part Number | Flat_Washer_001 |
| Material | Copper |
| Material Type | Copper |
| Metal | Copper |
| Number Of Items | 1 |
| Number of Pieces | 325 |
| Outside Diameter | 9-20 Millimetres |
| Outside diameter | 9-20 Millimetres |
| Screw Head Style | Flat |
| Set Name | Premium Copper Metric Sealing Crush Washers Assortment Kit |
| Size | Copper_Washers_325Pcs |
| Thread Size | Metric |
| Unit Count | 1.0 count |
| Washer Type | Flat |
| 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.
D**N
Quality service
As pictured and quick postage
J**P
Worth it
Good assortment works as it should seals right and price was good.
K**N
As advertised
works like they should, seem to be of good quality if the rubber holds up. I installed in a banjo fitting on a tractor hydraulic line..
M**T
Good quality—but 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 solid—soft 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 well—nothing dumps out when you open it. Here’s the catch: * The size range is limited, especially for real hydraulic applications * Works fine for smaller fittings, metric hardware, and light-duty stuff * But don’t expect it to cover larger hydraulic fittings—you’ll still need bigger washers separately Bottom line: Good kit to have around for general use and smaller banjo fittings, but it’s not a complete solution for hydraulic work. Think of it as a supplement, not a one-and-done kit.
Trustpilot
2 days ago
2 weeks ago