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Technical Data Sheet
321871R91 ✓ 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 material: STEEL COMP 303 OR STEEL COMP 1340H OVERALL, thickness: 0.006 INCHES MINIMUM AND 0.010 INCHES MAXIMUM IN, bore_shape: STRAIGHT, seat_angle: 45.0 DEGREES FIRST END, thread_class: 2A FIRST END A, bore_diameter: 20.0 MILLIMETERS NOMINAL MM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2920-00-917-8591, 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
321871R91
NSN: 2920-00-917-8591
FSC: 2920
CAGE: 92679 — NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 1340H OVERALL
thickness0.006 INCHES MINIMUM AND 0.010 INCHES MAXIMUM IN
bore_shapeSTRAIGHT
seat_angle45.0 DEGREES FIRST END
thread_class2A FIRST END A
bore_diameter20.0 MILLIMETERS NOMINAL MM
hole_diameter0.125 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
overall_width0.812 INCHES IN
load_directionRADIAL
overall_length72.000 INCHES NOMINAL IN
surface_finishGROUND
connection_typeTHREADED EXTERNAL PIPE SECOND END
NSN2920-00-917-8591
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPARK PLUG TITLE COMPONENT PN 321871R91 MFR SPARK PLUG
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
43F1-4X1-8Interchangeable
interchangeable cross-reference
interchangeable
43X4Interchangeable
interchangeable cross-reference
interchangeable
7974893Interchangeable
interchangeable cross-reference
interchangeable
B43Interchangeable
interchangeable cross-reference
interchangeable
MILT13513TYPEIInterchangeable
interchangeable cross-reference
interchangeable
YBV4C148Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 321871R91?
321871R91 is a SPARK PLUG.
What parts can replace 321871R91?
There are 22 known substitutes for 321871R91: 43F1-4X1-8, 43X4, 7974893 and 19 more. Substitute compatibility should be verified for your specific system.
Is 321871R91 still available?
321871R91 is currently cancelled.
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