Spark PlugCross Reference
NGK 6821
Compare interchangeable spark plugs for {brand} {part}. Check heat range, electrode gap, thread size, and reach before substituting — not all cross-referenced plugs perform the same in every engine.
40 matches found
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⚠ Important: Before substituting, confirm: same heat range, matching electrode gap, correct thread reach, and compatible resistor type.
ACDELCO
1 matchesAUTOLITE
2 matchesBOSCH
1 matchesBRISK
2 matchesCHAMPION
5 matchesDENSO
18 matchesU24FS-ZU154 total matchesU24FSR-ZU154 total matches4197139 total matches4215139 total matchesU17FS139 total matchesU16-FSR-U134 total matchesU24FSR-U68 total matches067700-561050 total matchesU24FSR-L49 total matchesU24FS-U40 total matches067800-462027 total matches400922 total matchesU24FS-L7 total matchesU24FS-C6 total matchesU24FS5 total matches06780046804 total matchesU24FB4 total matches06780047703 total matches
EYQUEM
1 matchesHONDA
1 matchesISKRA
1 matchesKAWASAKI
2 matchesKLG
2 matchesNGK
3 matchesSUZUKI
1 matchesFactory Direct
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