---
product_id: 542471226
title: "300 PCS Copper Sealing Rings Assortment Set, 12 Sizes Copper Metric Flat Sealing Washers Kit, Sump Plug Gasket Crush Washer Assortment, M5 M6 M8 M10 M12 M14 M16 M20"
brand: "putekco"
price: "1287163₫"
currency: VND
in_stock: true
reviews_count: 13
category: "Putekco"
url: https://www.desertcart.vn/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper
store_origin: VN
region: Vietnam
---

# high-temp resistant copper 300 pcs versatile kit 12 metric sizes 300 PCS Copper Sealing Rings Assortment Set, 12 Sizes Copper Metric Flat Sealing Washers Kit, Sump Plug Gasket Crush Washer Assortment, M5 M6 M8 M10 M12 M14 M16 M20

**Brand:** putekco
**Price:** 1287163₫
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal the deal with copper confidence — never get caught without the perfect washer!

## Quick Answers

- **What is this?** 300 PCS Copper Sealing Rings Assortment Set, 12 Sizes Copper Metric Flat Sealing Washers Kit, Sump Plug Gasket Crush Washer Assortment, M5 M6 M8 M10 M12 M14 M16 M20 by putekco
- **How much does it cost?** 1287163₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper)

## Best For

- putekco enthusiasts

## Why This Product

- Trusted putekco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seal Like a Pro:** Optimized flat design ensures a tighter, leak-proof seal that protects your bolts and nuts from damage.
- • **Organized On-the-Go:** Compact, labeled storage case keeps your washers sorted and ready wherever your work takes you.
- • **Multi-Industry Ready:** Perfect for automotive, marine, electrical, and plumbing applications—your all-in-one maintenance companion.
- • **Complete Copper Arsenal:** 300 precision-cut washers spanning 12 essential metric sizes for every project.
- • **Engineered for Endurance:** Crafted from premium red copper, delivering superior heat resistance and corrosion-proof longevity.

## Overview

This 300-piece copper sealing ring assortment offers 12 metric sizes of flat washers made from high-quality red copper, known for exceptional heat resistance, conductivity, and corrosion resistance. Ideal for automotive, marine, electrical, and plumbing uses, these washers provide a reliable, tight seal to protect fasteners and materials. Packaged in a sturdy, compartmentalized case, this kit ensures easy access and organization for professionals and DIY enthusiasts alike.

## Description

Why You Choose Our Metric Flat Copper Sealing Rings Assortment Set? 1. The assortment kit includes 300 pieces of copper washers in 12 different sizes, catering to various needs. 2. The flat washers are made of red copper, offering advantages such as high temperature resistance, high conductivity, tighter seal. 3. These washers are used in conjunction with nuts and bolts to provide a larger bearing surface, preventing the nut or bolt head from tearing through the material. 4. The copper washers have wide applications in electrical connections, household and commercial appliances, automotive and marine industries. 5. The assortment kit comes in a case. It is organized with compartments for easy selection and storage of different sizes, making it portable and user-friendly. Specifications: Sizes: M5 M6 M8 M10 M12 M14 M16 M20 Material: High quality Copper Quantity: 300pcs Washes Type: Flat Washers Package Includes: 35pcs....M5*9*1 30pcs....M6*10*1 30pcs....M6*12*1 30pcs....M8*13*1 25pcs....M8*14*1 30pcs....M10*14*1 25pcs....M12*16*1 20pcs....M12*18*1.5 25pcs....M14*18*1 20pcs....M16*20*1.5 15pcs....M16*22*1.5 15pcs....M20*26*1.5 All copper washers are packed in a case.

Review: Good sizes. - Good quality cooper washers.
Review: Works great for sealing and maintenance jobs - I bought this copper washer assortment set to keep in my garage for general maintenance work, and it’s already come in handy several times. The box includes a nice range of sizes — everything from small M5s to larger M20s — all neatly sorted in individual compartments. The copper quality seems solid; the washers are evenly cut and have a clean surface finish with no burrs or bends. I’ve used a few on brake line fittings and oil drain plugs, and they sealed perfectly without needing to over-tighten. The storage box isn’t the strongest plastic, but it keeps everything organized. For the price, the amount and variety you get makes this kit great value. Pros: 12 common metric sizes, all clearly labeled Good sealing performance and fit Handy to have for car, plumbing, or hydraulic work Cons: Box latch feels a bit flimsy Overall, if you do your own repairs or just like having spare washers on hand, this set is worth it.

## Features

- 【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】 The material of all flat washers are made of red copper, compare with steel and rubber washers, have a high temperature resistance and high conductivity, tighter seal, extreme durability, what’s more, it can be stored for a long time in wet environment because of corrosion resistant.
- 【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】 It can be used for electrical connections, such as: household, commercial appliances, automotive and marine, because of its high conductivity and corrosion resistant, it is very suitable for water, hydraulic fittings.
- 【Easy to Carry 】 It contains 300 pieces/12 sizes of the most commonly used copper flat washers, all copper washers are packed in a sturdy convenient case. there are many plaids, with label, it is very easy for you to distinguish each sizes. Easy to use and store.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C61TKSM6 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 8,401 in DIY & Tools ( See Top 100 in DIY & Tools ) 40 in Washers |
| Customer Reviews | 4.7 4.7 out of 5 stars (505) |
| Cutting Diameter | 5 Millimetres |
| Date First Available | 23 May 2023 |
| Finish | Brushed |
| Head Style | Flat |
| Item Weight | 280 g |
| Item diameter | 5 Millimetres |
| Item model number | Tool11 |
| Item thickness | 1 Millimetres |
| Manufacturer | taobai |
| Material | Copper |
| Measurement System | Metric |
| Number of Pieces | 300 |
| Part number | Tool11 |
| Shape | Flat |
| Size | 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 20mm |

## Product Details

- **Exterior finish:** Copper
- **Fastener size:** M5, M6, M8, M10, M12, M14, M16, M20
- **Item thickness:** 1 Millimetres
- **Material:** Copper
- **Washer type:** Flat

## Images

![300 PCS Copper Sealing Rings Assortment Set, 12 Sizes Copper Metric Flat Sealing Washers Kit, Sump Plug Gasket Crush Washer Assortment, M5 M6 M8 M10 M12 M14 M16 M20 - Image 1](https://m.media-amazon.com/images/I/71dDoR4hmvL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good sizes.
*by J***N on 6 October 2025*

Good quality cooper washers.

### ⭐⭐⭐⭐⭐ Works great for sealing and maintenance jobs
*by S***Y on 29 October 2025*

I bought this copper washer assortment set to keep in my garage for general maintenance work, and it’s already come in handy several times. The box includes a nice range of sizes — everything from small M5s to larger M20s — all neatly sorted in individual compartments. The copper quality seems solid; the washers are evenly cut and have a clean surface finish with no burrs or bends. I’ve used a few on brake line fittings and oil drain plugs, and they sealed perfectly without needing to over-tighten. The storage box isn’t the strongest plastic, but it keeps everything organized. For the price, the amount and variety you get makes this kit great value. Pros: 12 common metric sizes, all clearly labeled Good sealing performance and fit Handy to have for car, plumbing, or hydraulic work Cons: Box latch feels a bit flimsy Overall, if you do your own repairs or just like having spare washers on hand, this set is worth it.

### ⭐⭐⭐⭐ Copper washers
*by L***A on 2 January 2025*

Brillant good value

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-02-18*