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321577R91 — Technical Data Sheet

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— · 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

CAP ASSEMBLY,PROTECTIVE,MUFFLER-. Key specifications include end_item_identification: TRUCK; NAVISTAR INTERNATIONAL CORP; MODEL 1452, pipe_outside_diameter_accommodated: 5.000 INCHES IN. This part is cataloged in the Federal Logistics Information System under NSN 2990-00-870-7520, 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
321577R91
NSN: 2990-00-870-7520
FSC: 2990
CAGE: 29510 — KOMATSU AMERICAN INTL CO (USA)
SPECIFICATIONS
end_item_identificationTRUCK; NAVISTAR INTERNATIONAL CORP; MODEL 1452
pipe_outside_diameter_accommodated5.000 INCHES IN
NSN2990-00-870-7520
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAP ASSEMBLY,PROTECTIVE,MUFFLER- TITLE COMPONENT PN 321577R91 MFR CAP ASSEMBLY,PROTECTIV
KEY FEATURES
•
MATERIAL: STEEL
•
PIPE DIAMETER RANGE ACCOMMODATED: +4.750 TO 5.000 INCHES IN
TECHNICAL CHARACTERISTICS
MATERIALSTEEL
PIPE DIAMETER RANGE ACCOMMODATED+4.750 TO 5.000 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
FB0046-51N0DInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
51N0DInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5238GX2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
3776InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
568683InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
610210C91InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 321577R91?
321577R91 is a CAP ASSEMBLY,PROTECTIVE,MUFFLER-.
What parts can replace 321577R91?
There are 12 known substitutes for 321577R91: FB0046-51N0D, 51N0D, 5238GX2 and 9 more. Substitute compatibility should be verified for your specific system.
Is 321577R91 still available?
321577R91 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: September 2026