{"product_id":"copper-flat-washer-sealing-gasket-assortment-kit-m4-m14","title":"Copper Flat Washer Sealing Gasket Assortment Kit – M4 to M14","description":"\n\u003ch2\u003eCopper Flat Washer \u0026amp; Sealing Gasket Assortment Kit\u003c\/h2\u003e\n\u003cp\u003eKeep your projects leak-free and fasteners secure with this versatile \u003cstrong\u003eCopper Flat Washer Sealing Gasket Kit\u003c\/strong\u003e. Available in sets of 50, 100, or 120 pieces, this assortment covers the most common metric sizes (M4 through M14), making it the only kit you'll need for household repairs, automotive work, hydraulic systems, and more.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose Copper Washers?\u003c\/h3\u003e\n\u003cp\u003eRed copper is prized for its outstanding sealing capability, excellent heat resistance, superior electrical and thermal conductivity, and impressive wear resistance. These solid flat gaskets create a reliable, pressure-distributing barrier between fasteners and mating surfaces — reducing friction, preventing loosening, and isolating metal-to-metal contact.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium Red Copper Material:\u003c\/strong\u003e High hardness with strong, durable construction for long-lasting performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Size Assortment:\u003c\/strong\u003e Includes M4, M5, M6, M8, M10, M12, and M14 flat washers in one convenient kit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuperior Sealing:\u003c\/strong\u003e Creates a tight, leak-resistant seal for hydraulic fittings, fuel lines, plumbing, and electrical connections.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Pairs perfectly with standard screws, nuts, and bolts of corresponding sizes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Application:\u003c\/strong\u003e Ideal for automotive, marine, industrial machinery, household appliances, and commercial equipment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Packaging:\u003c\/strong\u003e Neatly packaged in a 13 × 7 × 2 cm case for easy storage and access.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSize Breakdown by Kit\u003c\/h3\u003e\n\u003ch4\u003e50-Piece Kit\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM4 × 8 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM5 × 9 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM6 × 10 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM8 × 12 × 1 mm — 5 pcs\u003c\/li\u003e\n  \u003cli\u003eM10 × 14 × 1 mm — 5 pcs\u003c\/li\u003e\n  \u003cli\u003eM12 × 16 × 1 mm — 5 pcs\u003c\/li\u003e\n  \u003cli\u003eM14 × 18 × 1 mm — 5 pcs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e100-Piece Kit\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM4 × 8 × 1 mm — 20 pcs\u003c\/li\u003e\n  \u003cli\u003eM5 × 9 × 1 mm — 20 pcs\u003c\/li\u003e\n  \u003cli\u003eM6 × 10 × 1 mm — 20 pcs\u003c\/li\u003e\n  \u003cli\u003eM8 × 12 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM10 × 14 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM12 × 16 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM14 × 18 × 1 mm — 10 pcs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e120-Piece Kit\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM4 × 8 × 1 mm — 30 pcs\u003c\/li\u003e\n  \u003cli\u003eM5 × 9 × 1 mm — 30 pcs\u003c\/li\u003e\n  \u003cli\u003eM6 × 10 × 1 mm — 20 pcs\u003c\/li\u003e\n  \u003cli\u003eM8 × 12 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM10 × 14 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM12 × 16 × 1 mm — 10 pcs\u003c\/li\u003e\n  \u003cli\u003eM14 × 18 × 1 mm — 10 pcs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Solid Red Copper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable Quantities:\u003c\/strong\u003e 50, 100, or 120 pieces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSizes Included:\u003c\/strong\u003e M4, M5, M6, M8, M10, M12, M14\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 1 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 13 × 7 × 2 cm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eThese copper sealing washers are widely used across many industries and DIY applications, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomotive fuel and oil system fittings\u003c\/li\u003e\n  \u003cli\u003eMarine and hydraulic equipment connections\u003c\/li\u003e\n  \u003cli\u003ePlumbing and pipe fittings\u003c\/li\u003e\n  \u003cli\u003eElectrical appliances and panel assemblies\u003c\/li\u003e\n  \u003cli\u003eIndustrial machinery maintenance\u003c\/li\u003e\n  \u003cli\u003eGeneral household repairs and DIY projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-inch-threaded-brass-ball-valve-water-gas-oil-flow-control\"\u003e1-Inch Threaded Brass Ball Valve – Water, Gas \u0026amp; Oil Flow Control\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-1-4-inch-adjustable-washbasin-siphon-trap-leak-proof-silicone-seal\"\u003e1-1\/4\" Adjustable Washbasin Siphon Trap | Leak-Proof Silicone\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe use of hardware fasteners and tools in industrial and home settings, visit the \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Hand \u0026amp; Power Tools Safety Resource\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Monitor brightness and lighting conditions may cause slight color variations compared to actual product. Please allow a minor tolerance in manual measurements.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What sizes of copper washers are included in the assortment kit?\u003c\/h4\u003e\n\u003cp\u003eA: The kit includes seven metric sizes — M4, M5, M6, M8, M10, M12, and M14 — all at 1 mm thickness. Each size is grouped for easy identification. Depending on the kit size you choose (50, 100, or 120 pieces), the quantity per size varies accordingly.\u003c\/p\u003e\n\u003ch4\u003eQ: What are copper flat washers typically used for?\u003c\/h4\u003e\n\u003cp\u003eA: Copper flat washers are commonly used in automotive fuel and oil line fittings, hydraulic system connections, plumbing joints, marine equipment, and electrical assemblies. Their excellent thermal and electrical conductivity, combined with strong sealing properties, make them a go-to choice for creating leak-resistant connections in demanding environments.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these washers compatible with standard screws and bolts?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! These copper gaskets are fully compatible with standard metric screws, nuts, and bolts of the corresponding size (M4 through M14). They provide a wider bearing surface that helps distribute load, reduce friction, and prevent fastener loosening over time.\u003c\/p\u003e\n\u003ch4\u003eQ: Why use copper washers instead of steel or rubber ones?\u003c\/h4\u003e\n\u003cp\u003eA: Copper offers a unique combination of benefits: superior heat resistance, excellent electrical and thermal conductivity, strong sealing under compression, and good wear resistance. This makes copper washers especially suitable for high-temperature or electrically sensitive applications where rubber or steel may not perform as well.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What sizes of copper washers are included in the assortment kit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The kit includes seven metric sizes — M4, M5, M6, M8, M10, M12, and M14 — all at 1 mm thickness. Each size is grouped for easy identification. 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This makes copper washers especially suitable for high-temperature or electrically sensitive applications where rubber or steel may not perform as well.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Crafts, DIY \u0026 Stationery\", \"item\": \"https:\/\/oasis-select.com\/collections\/crafts-diy-stationery\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Copper Flat Washer Sealing Gasket Assortment Kit – M4 to M14\", \"item\": \"https:\/\/oasis-select.com\/products\/copper-flat-washer-sealing-gasket-assortment-kit-m4-m14\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"100pcs","offer_id":47748530143337,"sku":"14:29#100pcs","price":13.99,"currency_code":"USD","in_stock":true},{"title":"120pcs","offer_id":47748530176105,"sku":"14:365462#120pcs","price":13.99,"currency_code":"USD","in_stock":true},{"title":"50pcs","offer_id":47748530208873,"sku":"14:193#50pcs","price":13.99,"currency_code":"USD","in_stock":true},{"title":"aluminum 100pcs","offer_id":47748530241641,"sku":"14:175#aluminum 100pcs","price":13.99,"currency_code":"USD","in_stock":true},{"title":"280pcs","offer_id":47748530274409,"sku":"14:366#280pcs","price":13.99,"currency_code":"USD","in_stock":true},{"title":"150pcs","offer_id":47748530307177,"sku":"14:200025551#150pcs","price":13.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S9a4d4b8ec4a94b90b7209bd01c3af166U.webp?v=1783085519","url":"https:\/\/oasis-select.com\/products\/copper-flat-washer-sealing-gasket-assortment-kit-m4-m14","provider":"Oasis Select","version":"1.0","type":"link"}