Skip to the beginning of the images gallery

Metric Copper Sealing Washers

d Diameter 12mm	Adaptall Material Steel	S Misc 1.4mm	Adaptall Shape Component	Side 1 Callout M8 X 1.0	Side 1 Gender -	Side 1 Size 8mm	Side 1 Type Metric	Brand Adaptall America	Brand Adaptall	Pack Size 1.00	UOM EA	Supplier Part Number 3500-08MM	Product Weight 0.01 lbs

Product Questions & Answers 2

Product Questions & Answers

These are listed as copper washers but the attributes say steel, which one is it actually?

Question by: Jimmy M on Aug 5, 2025, 9:03 AM

Copper is the correct material here. The product name, description, and intended use all point to copper construction. The steel notation in the attributes appears to be a data entry error on the spec side. Copper is what you're getting, and it's what makes these work well for sealing applications where corrosion resistance matters.

Answer by: Customer Support on Aug 7, 2025, 7:52 AM

got an M8 x 1.0 bolt, are these the right sealing washers for it?

Question by: Stan B on Apr 21, 2025, 5:22 PM

Match the callout on the washer to your fastener. These are sized M8 x 1.0, with an 8mm side 1 size, so they line up with M8 x 1.0 metric hardware.

Answer by: Customer Support on Apr 23, 2025, 9:35 AM