10Pcs DIN7603 Copper Crush Washers M6–M20 Sealing Gaskets

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Inner Diameter

10Pcs DIN7603 Copper Sealing Washers — M6 to M20

Keep your fittings leak-free with this versatile set of 10 DIN7603 copper crush washers. Covering nine popular metric sizes — M6, M8, M9, M10, M12, M14, M16, M18, and M20 — this assortment is the ideal workshop companion for plumbing, hydraulic, automotive, and marine applications. Each washer is stamped from solid copper, which deforms slightly under torque to create a reliable metal-to-metal seal that prevents oil, fuel, or fluid seepage.

Made in China.

Key Features

Material: Pure copper (metal) for excellent malleability and corrosion resistance
Standard: DIN7603 — internationally recognised flat sealing ring specification
Sizes included: M6, M8, M9, M10, M12, M14, M16, M18, M20 (15 size options available)
Thickness: 1.5 mm (CS1.5 mm cross-section)
Shape: Flat ring gasket — uniform seating surface for consistent compression
Pack quantity: 10 pieces per order
Use case: Drain plugs, banjo bolts, hydraulic fittings, oil lines, boat/marine connections, and more

Why Choose Copper Crush Washers?

Copper's natural softness allows the washer to conform precisely to mating surfaces when tightened, filling microscopic imperfections and forming an airtight or fluid-tight seal. Unlike rubber O-rings, copper washers withstand high temperatures and resist degradation from petroleum-based fluids, making them the go-to choice for engine drain plugs and hydraulic joints. Simply install, torque to spec, and enjoy a long-lasting, drip-free connection.

Specifications at a Glance

Material	Metal Copper
Standard	DIN7603
Thickness	1.5 mm
Sizes	M6, M8, M9, M10, M12, M14, M16, M18, M20
Quantity	10 pcs
Shape	Flat Ring Gasket
Origin	Mainland China

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Frequently Asked Questions

Q: What sizes are included in the 10-piece DIN7603 copper washer set?

A: The set covers nine metric thread sizes: M6, M8, M9, M10, M12, M14, M16, M18, and M20. All washers are 1.5 mm thick and comply with the DIN7603 flat sealing ring standard, making them suitable for a wide range of bolts and fittings.

Q: Can these copper crush washers be reused?

A: Copper crush washers are designed as single-use sealing components. Once compressed and torqued, the copper deforms to fill the mating surfaces. For the most dependable seal and to avoid fluid seepage, it is recommended to install a fresh washer each time a fitting is removed and re-torqued.

Q: What applications are these DIN7603 copper washers suitable for?

A: These washers are ideal for automotive oil drain plugs, banjo bolt connections, hydraulic fittings, fuel line joints, marine/boat plumbing, and general industrial pipe fittings. Their copper construction makes them compatible with oil, fuel, water, and other common fluids.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.

We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.