--- 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: "€ 33.18" currency: EUR in_stock: true category: "Putekco" url: https://www.desertcart.pt/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper store_origin: PT region: Portugal --- # Superior conductivity High temp resistance 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:** € 33.18 **Availability:** ✅ In Stock ## Summary > 🔧 Seal it right, every time — the copper kit pros trust! ## 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?** € 33.18 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 - • **Optimized Sealing:** Flat washers provide a tighter seal to prevent leaks and material damage - • **Complete Size Range:** 12 metric sizes from M5 to M20 cover every project need - • **Multi-Industry Ready:** Perfect for automotive, marine, electrical, plumbing & hydraulic applications - • **Premium Copper Build:** Red copper ensures corrosion resistance and long-lasting durability - • **Organized Portability:** Compact case with labeled compartments for quick size selection and storage ## Overview This 300-piece copper sealing ring assortment offers 12 essential metric sizes (M5-M20) crafted from high-quality red copper. Designed for superior temperature resistance, conductivity, and corrosion protection, these flat washers deliver reliable sealing and load distribution across automotive, marine, electrical, and plumbing projects. Neatly organized in a portable case, this kit is a must-have for professionals and DIYers aiming for precision and durability. ## 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. ## 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 | 9,858 in DIY & Tools ( See Top 100 in DIY & Tools ) 47 in Washers | | Brand Name | PUTEKCO | | Colour | Copper | | Country Of Origin | China | | Customer Reviews | 4.7 4.7 out of 5 stars (652) | | Exterior Finish | Copper | | Fastener Size | M5, M6, M8, M10, M12, M14, M16, M20 | | Fastener Type | Flat Washer | | Finish Types | Brushed | | Item Diameter | 5 Millimetres | | Item Dimensions | 17 x 9.5 x 2.2 centimetres | | Item Thickness | 1 Millimetres | | Manufacturer | taobai | | Manufacturer Part Number | Tool11 | | Material Type | Copper | | Metal | Copper | | Model Number | Tool11 | | Number Of Items | 300 | | Number of Packs | 12 | | Number of Pieces | 300 | | Outside Diameter | - Inches | | Screw Head Style | Flat | | Set Name | 300 PCS Copper Sealing Rings Assortment Set | | 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 Compatibility | Metric Bolts | | 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/619X+e4ajmL.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/51MxkE2HrpL.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/51K6V9l00cL.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/61Dw5EMcbeL.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/61ftAGykLLL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper](https://www.desertcart.pt/products/542471226-300-pcs-copper-sealing-rings-assortment-set-12-sizes-copper) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-10-16*