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Technical Data Sheet
PartsTable / COMPONENT / AGR21
AGR21 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The SPARK PLUG is a the manufacturer industrial component. Key specifications include body_style: UNSHIELDED, SOLID POST, GASKET SEAT, reach_length: 0.750 INCHES NOMINAL IN, usage_design: ENGINE OTHER THAN AIRCRAFT, electrode_style: SINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4), pressure_rating: 300.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 330.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS, width_across_flats: 0.812 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2920-00-003-5158, 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
AGR21
NSN: 2920-00-003-5158
FSC: 2920
CAGE: 23040 — FORD MOTOR CO FORD PARTS AND SERVICE DIV GOVERNMENT PART SALES (USA)
SPECIFICATIONS
body_styleUNSHIELDED, SOLID POST, GASKET SEAT
reach_length0.750 INCHES NOMINAL IN
usage_designENGINE OTHER THAN AIRCRAFT
electrode_styleSINGLE FLAT SHELL GROUND ELECTRODE (SEE ALSO STYLE 4)
pressure_rating300.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 330.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS
width_across_flats0.812 INCHES NOMINAL IN
seat_major_diameter0.8125 INCHES MAXIMUM IN
nondefinitive_spec/std_data3 TYPE AND A CLASS
dc_resistance_rating_in_ohms10000.0 NOMINAL
height_above_mounting_surface2.200 INCHES NOMINAL IN
NSN2920-00-003-5158
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPARK PLUG TITLE COMPONENT PN AGR21 MFR SPARK PLUG
KEY FEATURES
•
BODY STYLE: UNSHIELDED, SOLID POST, GASKET SEAT
•
USAGE DESIGN: ENGINE OTHER THAN AIRCRAFT
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND A CLASS
•
TEST DATA DOCUMENT: 81348-WS506 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
•
WIDTH ACROSS FLATS: 0.812 INCHES NOMINAL IN
•
DC RESISTANCE RATING IN OHMS: 10000.0 NOMINAL
•
REACH LENGTH: 0.750 INCHES NOMINAL IN
•
HEIGHT ABOVE MOUNTING SURFACE: 2.200 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY STYLEUNSHIELDED, SOLID POST, GASKET SEAT
USAGE DESIGNENGINE OTHER THAN AIRCRAFT
NONDEFINITIVE SPEC/STD DATA3 TYPE AND A CLASS
TEST DATA DOCUMENT81348-WS506 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
WIDTH ACROSS FLATS0.812 INCHES NOMINAL IN
DC RESISTANCE RATING IN OHMS10000.0 NOMINAL
REACH LENGTH0.750 INCHES NOMINAL IN
HEIGHT ABOVE MOUNTING SURFACE2.200 INCHES NOMINAL IN
PRESSURE RATING300.0 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 330.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM MEAN EFFECTIVE LBS
SEAT MAJOR DIAMETER0.8125 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
WS506Interchangeable
Same NIIN cross-reference
interchangeable
RN4CInterchangeable
Same NIIN cross-reference
interchangeable
R43XLInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AGR21?
AGR21 is a SPARK PLUG.
What parts can replace AGR21?
There are 3 known substitutes for AGR21: WS506, RN4C, R43XL. Substitute compatibility should be verified for your specific system.
Is AGR21 still available?
AGR21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026