---
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: "30069CFA"
currency: XOF
in_stock: true
reviews_count: 8
category: "Putekco"
url: https://www.desertcart.sn/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper
store_origin: SN
region: Senegal
---

# Organized portable case High-temp resistant copper 300 pcs versatile kit 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:** 30069CFA
**Availability:** ✅ In Stock

## Summary

> 🔩 Seal it right, every time — the pro’s copper crush washer kit!

## 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?** 30069CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/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

- • **Multi-Industry Ready:** Ideal for automotive, marine, plumbing, and electrical applications.
- • **Compact & Organized Storage:** Neatly labeled compartments for quick access and hassle-free storage.
- • **Premium Red Copper Durability:** Superior heat resistance and corrosion-proof for lasting performance.
- • **Comprehensive 12-Size Assortment:** From M5 to M20, every size you need in one sleek kit.
- • **Optimized Seal & Load Distribution:** Prevents bolt damage with a perfect crush washer fit.

## Overview

This 300-piece copper sealing ring assortment offers 12 metric sizes (M5-M20) crafted from high-quality red copper, ensuring exceptional heat resistance, conductivity, and corrosion protection. Designed to provide a tighter seal and prevent bolt damage, it’s perfect for automotive, marine, plumbing, and electrical uses. All washers come neatly organized in a portable, labeled case for easy selection and storage, making it an essential toolkit upgrade for maintenance pros 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 |
| Best Sellers Rank | 6,524 in DIY & Tools ( See Top 100 in DIY & Tools ) 28 in Washers |
| Brand Name | PUTEKCO |
| Country Of Origin | China |
| Customer Reviews | 4.7 out of 5 stars 527 Reviews |
| Exterior Finish | Copper |
| Exterior finish | Copper |
| Fastener Size | M5, M6, M8, M10, M12, M14, M16, M20 |
| Fastener Type | Flat Washer |
| Fastener size | M5, M6, M8, M10, M12, M14, M16, M20 |
| Finish Types | Brushed |
| Item Diameter | 5 Millimetres |
| Item Dimensions | 17 x 9.5 x 2.2 centimetres |
| Item Thickness | 1 Millimetres |
| Item thickness | 1 Millimetres |
| Manufacturer | taobai |
| Material | Copper |
| Material Type | Copper |
| Metal | Copper |
| Number of Pieces | 300 |
| Outside Diameter | - Inches |
| Screw Head Style | Flat |
| Size | 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 20mm |
| Thread Size | M5, M6, M8, M10, M12, M14, M16, M20 |
| Unit Count | 300.0 count |
| Washer Type | Flat |
| Washer type | Flat |

## 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)
![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 2](https://m.media-amazon.com/images/I/71pLl+aaf1L.jpg)
![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 3](https://m.media-amazon.com/images/I/71uKeDiFuRL.jpg)
![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 4](https://m.media-amazon.com/images/I/71lTf2rrhmL.jpg)
![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 5](https://m.media-amazon.com/images/I/71-k9MaXPhL.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 M***K on 6 July 2025*

Handy to have a selection in the tool box reasonable quality used on several jobs already

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-02-23*