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Single GasketPack of 100
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AN4027-1, 18MM. These are the AN4027-1 18mm copper spark plug gaskets.

20% Discount on Box of 100
Made of solid copper to current aircraft standards. Available in 14 MM and 18 MM sizes.
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Exactly as described...ð

January 20, 2021

They were reasonably priced, shipped and received promptly, were the right size. I didnât count them, but no reason to think there were less than 100. Which should last me quite a long time - using them on a classic car with 2 plugs for each of itâs 6 enormous cylinders.

January 19, 2021

Exactly as advertised!

Dennis K
December 17, 2020

Buy 100 of the spark plug gaskets and you will not find a better price on new gaskets.

Peter T
December 9, 2020

They are round, which is good, and they fit my spark plugs, which is also good.

Victor B
November 24, 2020

great value. The best price we could find.

Central A
September 2, 2020

Good price and work as expected.

Richard C
August 17, 2020

was just what I needed

July 22, 2020

Heres the deal folks...All aircraft engine manufacturers specify using a NEW gaskets when removing and replacing aviation spark plugs. If you run a Repair Station or you are an A.I. you best be using NEW gaskets (and billed on your work orders) to avoid potential liability issues. These generic branded M-674 gaskets are the correct Rockwell hardness and dimensions. We use thousands of gaskets per year and these Aircraft Spruce gaskets are now our #1 choice.

July 21, 2020

Look just like OEM. More convenient than buying a box of 100.

Donald S
June 30, 2020


Q: Will these gaskets work on Tempest spark plugs? Tempest has part number UM-674.

Yes, these copper spark plug gaskets will work on Tempest or Champion plugs.

Q: Part # 07-00877: Please inform Inside Diameter & Thickness

.71" ID or just over 18mm OD. 0.08 thick.

Q: Are the 18mm gaskets right for the O320 Lyc ?

Yes, that would be correct.

Q: Are the 18mm gaskets used for a Lycoming IO-360 with Champion plugs?

Yes, the IO-360 will use 18mm plugs.

Q: would these work with lycoming IO540 with Champion REM38E plugs?

Yes, REM38E are 18mm plugs. These will work.

Q: Work on rem37by plugs? Champion

Yes, the REM37BY plugs are 18mm.

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