Copper Washer Seal Kit 100/200Pcs M4–M14 for Oil Pan Plugs
Copper Washer Seal Kit 100/200Pcs M4–M14 for Oil Pan Plugs
Copper Washer Seal Combination Kit — M4 to M14 | 100 or 200 Pieces
Keep your mechanical projects leak-free and running smoothly with this comprehensive Copper Washer Seal Combination Kit. Available in 100-piece or 200-piece sets, this kit covers sizes M4, M5, M6, M8, M10, M12, and M14 — making it the only set you'll need for oil pan plugs, engine work, plumbing fittings, and general metalworking tasks. Made in Mainland China.
Why Choose This Copper Washer Kit?
- Premium Copper Material: Each washer is crafted from high-quality copper, offering excellent thermal conductivity, natural corrosion resistance, and a long service life — even in demanding environments.
- Complete Size Range: Includes M4, M5, M6, M8, M10, M12, and M14 washers so you're always prepared for the job at hand, whether it's a quick drain plug swap or a full engine service.
- Organized Storage Box: Every set comes in a purpose-built compartmented box — keeping all sizes sorted, protected, and easy to grab when you need them. No more hunting through a toolbox for the right washer.
- Leak-Resistant Sealing: The soft, malleable copper conforms to mating surfaces under torque, creating a reliable metal-to-metal seal that helps prevent fluid seepage around plugs and fittings.
- Wide Application: Perfect for oil drain plugs, hydraulic fittings, fuel systems, gearbox plugs, air compressor fittings, and virtually any mechanical or plumbing application requiring a sealing washer.
- Great Value: Buying a full assortment in one kit means lower cost per washer and fewer emergency hardware runs.
Product Specifications
| Material | Copper |
| Available Sizes | M4, M5, M6, M8, M10, M12, M14 |
| Thickness | 1 mm |
| Quantity Options | 100 Pieces / 200 Pieces |
| Storage | Includes compartmented storage box |
| Origin | Made in Mainland China |
What's in the Box?
- 1 × Compartmented storage box containing 100 or 200 copper sealing washers (assorted M4–M14)
Common Applications
- Engine oil drain plugs & oil pan sealing
- Gearbox and differential drain plugs
- Hydraulic line fittings and banjo bolts
- Fuel system fittings and carburetors
- Air compressor and pneumatic fittings
- General industrial metalworking and plumbing
Note: Due to differences in monitor calibration and lighting, the actual color may vary slightly from product images. Please allow ±1–3 mm measuring deviation due to manual measurement.
For guidance on fastener standards and hardware safety, visit the U.S. Consumer Product Safety Commission (CPSC).
Frequently Asked Questions
Q: What sizes are included in this copper washer seal kit?
A: The kit includes copper sealing washers in sizes M4, M5, M6, M8, M10, M12, and M14, covering the most common metric sizes used for oil pan plugs, hydraulic fittings, and general mechanical applications. Choose between a 100-piece or 200-piece set depending on your project needs.
Q: Are these copper washers reusable?
A: Copper sealing washers can sometimes be reused if they are in good condition and have not been significantly deformed. However, for critical applications such as oil drain plugs or high-pressure fittings, it is best practice to replace the washer each time to ensure a reliable, leak-resistant seal.
Q: What is the thickness of the washers in this kit?
A: Each copper washer in this combination kit has a thickness of 1 mm, which is the standard thickness for most sealing washer applications on oil plugs and mechanical fittings.
Q: Why use copper washers instead of rubber or aluminum?
A: Copper offers an excellent combination of malleability, thermal conductivity, and corrosion resistance. It conforms under torque to create a tight metal-to-metal seal, making it ideal for high-temperature environments like engine oil systems, where rubber seals might degrade and aluminum may not conform as well.