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This 325-piece assortment of premium red copper flat crush washers covers 10 metric sizes (M5 to M14), delivering durable, corrosion-resistant sealing solutions for automotive, industrial, and household applications. Packaged in a sturdy, transparent organizer with a size chart, it offers professional-grade reliability and convenience for every repair or DIY project.







| ASIN | B0CR8XPH5P |
| Best Sellers Rank | #1,535 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Flat Washers |
| Brand | AKOSN |
| Color | Copper |
| Compatible Groove Diameter | 0.2 Inches |
| Customer Reviews | 4.6 out of 5 stars 769 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 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 | 1.0 Count |
| Washer Compatibility | Metric Bolts, Metric Screws |
| Washer Type | Flat |
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.
B**N
Great Value
Nice and cheap. Don't have to spend $7 for two washers at the auto-parts store when this will last you years at less than twice the price on just 2 washers.
A**N
Great item to have on hand
Thinner in every dimension than what comes with a new brake caliper, but still works fine.
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.
S**3
red copper washer kit
as described, good dimension tolerances. proper thickness. would recommend to other buyers
D**N
Nice variety
Helped me do some major rewiring on my car.
K**N
Durable and lots of sizes to fit all your vehicles
This kit is wonderful. I have several vehicles so there was a size for each one. These a the perfect thickness and a good value for the money.
B**A
Good and Cheap
Work well, haven't had any leaks or problems with them yet.
D**N
Quality service
As pictured and quick postage
Trustpilot
1 month ago
2 months ago