Copper Washer Kit M4–M14 | 100-Piece Seal Assortment Box

Copper Washer & Seal Combination Kit — M4 to M14

Meet your go-to fastener solution: a 100-piece copper washer assortment covering the most common metric sizes — M4, M5, M6, M8, M10, M12, and M14 — all neatly organized in a reusable storage box. Whether you're tackling a weekend DIY project, maintaining machinery, or keeping your workshop stocked, this kit delivers the right seal every time.

Why Choose This Copper Washer Kit?

• Premium Copper Construction: Each washer is crafted from solid copper, offering excellent corrosion resistance, reliable sealing performance, and long-lasting durability across a wide range of applications.
• Comprehensive Size Range: Seven metric sizes (M4, M5, M6, M8, M10, M12, M14) in one kit — no need to hunt for individual sizes separately.
• Organized Storage Box: Comes in a segmented box that keeps every size sorted and easy to grab when you need it.
• Versatile Use: Ideal for oil pan drain plugs, automotive maintenance, plumbing fittings, mechanical assemblies, and general DIY repairs.
• Works Right Out of the Box: Ready to use immediately — no pre-treatment or additional tools needed.
• Great Value: A cost-effective way to build or replenish your fastener supply with a single, well-rounded assortment.

Product Specifications

• Material: Copper
• Sizes Included: M4, M5, M6, M8, M10, M12, M14
• Total Quantity: 100 pieces
• Packaging: Segmented storage box
• Application: Oil pan plugs, plumbing, automotive, mechanical, and DIY projects

For general fastener standards and guidance, visit NIST Standards Resources.

Frequently Asked Questions

Q: What sizes are included in this copper washer kit?

A: This kit includes copper washers in seven metric sizes: M4, M5, M6, M8, M10, M12, and M14, giving you comprehensive coverage for the most common fastener applications in a single organized box.

Q: What are copper washers typically used for?

A: Copper washers are widely used as sealing washers for oil drain plugs, hydraulic fittings, plumbing connections, and mechanical assemblies. Their natural malleability allows them to compress and form a tight, leak-resistant seal around bolts and nuts.

Q: How many washers come in this assortment kit?

A: The kit contains 100 pieces total, distributed across the seven metric sizes (M4–M14), all stored in a convenient segmented box for easy access and organization.

Q: Are these washers suitable for automotive use?

A: Yes — copper washers are a popular choice for automotive applications, particularly as sealing washers for oil pan drain plugs. Their durability and malleability make them well-suited for use in engines and other mechanical systems.