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SP204B4S — SPARK PLUG

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

SP204B4S: SPARK PLUG.

The SPARK PLUG is a the manufacturer industrial component. Key specifications include body_style: ELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT, reach_length: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, usage_design: ENGINE OTHER THAN AIRCRAFT, electrode_style: SINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4), pressure_rating: 180.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 229.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS, width_across_flats: 0.875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 2920-00-287-8818, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
SP204B4S
NSN: 2920-00-287-8818
FSC: 2920 — Engine Electrical System Components, Nonaircraft
CAGE: 14351 — TELEDYNE CONTINENTAL MOTORS INDUSTRIAL PRODUCTS DIV TELEDYNE INDUSTRIES INC SUB OF TELEDYNE INC (USA)
SPECIFICATIONS
body_styleELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT
reach_length0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
usage_designENGINE OTHER THAN AIRCRAFT
electrode_styleSINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4)
pressure_rating180.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 229.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS
width_across_flats0.875 INCHES NOMINAL IN
seat_major_diameter1.000 INCHES NOMINAL IN
shield_thread_length0.375 INCHES NOMINAL IN
nondefinitive_spec/std_data2 TYPE AND B CLASS
height_above_mounting_surface2.328 INCHES MINIMUM AND 2.348 INCHES MAXIMUM IN
top_to_shield_thread_distance0.125 INCHES NOMINAL IN
terminal_sleeve_inside_diameter0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN
NSN2920-00-287-8818
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPARK PLUG TITLE COMPONENT PN SP204B4S MFR SPARK PLUG
KEY FEATURES
•
PRESSURE RATING: 180.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 229.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS
•
WIDTH ACROSS FLATS: 0.875 INCHES NOMINAL IN
•
TOP TO TERMINAL CONTACT DISTANCE: 1.000 INCHES NOMINAL IN
•
HEIGHT ABOVE MOUNTING SURFACE: 2.328 INCHES MINIMUM AND 2.348 INCHES MAXIMUM IN
•
USAGE DESIGN: ENGINE OTHER THAN AIRCRAFT
•
ELECTRODE STYLE: SINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4)
•
BODY STYLE: ELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT
•
REACH LENGTH: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
PRESSURE RATING180.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 229.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS
WIDTH ACROSS FLATS0.875 INCHES NOMINAL IN
TOP TO TERMINAL CONTACT DISTANCE1.000 INCHES NOMINAL IN
HEIGHT ABOVE MOUNTING SURFACE2.328 INCHES MINIMUM AND 2.348 INCHES MAXIMUM IN
USAGE DESIGNENGINE OTHER THAN AIRCRAFT
ELECTRODE STYLESINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4)
BODY STYLEELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT
REACH LENGTH0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
SEAT MAJOR DIAMETER1.000 INCHES NOMINAL IN
SHIELD THREAD LENGTH0.375 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
71X164Reference document
Same NSN cross-reference
Reference document — Secondary reference
WS506TYPE2CLASSBReference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SP204B4S?
SP204B4S is a SPARK PLUG.
What parts can replace SP204B4S?
There are 2 known substitutes for SP204B4S: 71X164, WS506TYPE2CLASSB. Substitute compatibility should be verified for your specific system.
What is the NSN for SP204B4S?
SP204B4S is cataloged in the U.S. Government catalog under NSN 2920-00-287-8818. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.