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S421 ✓ 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

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include material: STEEL OVERALL, opening_width: 1.250 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN, end_similarity: IDENTICAL, overall_length: 2.93 INCHES MINIMUM IN, surface_finish: 10.0 MICROINCHES, drive_end_shape: SQUARE SINGLE END INTERNAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3040-00-980-0727, 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
S421
NSN: 3040-00-980-0727
FSC: 3040
CAGE: 00141 — ROLLER BEARING CO OF AMERICA, INC DIV PIC DESIGN (USA)
SPECIFICATIONS
materialSTEEL OVERALL
opening_width1.250 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
end_similarityIDENTICAL
overall_length2.93 INCHES MINIMUM IN
surface_finish10.0 MICROINCHES
drive_end_shapeSQUARE SINGLE END INTERNAL
first_end_stylePLAIN
style_designatorINTERNAL-INTERNAL
termination_typeLUG SPADE SECOND END FIRST CONDUCTOR
unable_to_decodeUNABLE TO DECODE
features_providedMANUAL TOOL
surface_treatmentCHROMIUM OVERALL
NSN3040-00-980-0727
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available FILTER,RADIO FREQUENCY INTERFERE TITLE COMPONENT PN S421 MFR FILTER,RADIO FREQUENCY
KEY FEATURES
•
FIRST END STYLE: PLAIN
•
FIRST END DIAMETER: 0.2495 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 303
•
END SIMILARITY: IDENTICAL
•
SURFACE FINISH: 10.0 MICROINCHES
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLEPLAIN
FIRST END DIAMETER0.2495 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM IN
MATERIALSTEEL COMP 303
END SIMILARITYIDENTICAL
OVERALL LENGTH2.110 INCHES MINIMUM AND 2.130 INCHES MAXIMUM IN
SURFACE FINISH10.0 MICROINCHES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
A321Interchangeable
interchangeable cross-reference
interchangeable
406446Interchangeable
interchangeable cross-reference
interchangeable
8177310Interchangeable
interchangeable cross-reference
interchangeable
A321AJInterchangeable
interchangeable cross-reference
interchangeable
841A406Interchangeable
interchangeable cross-reference
interchangeable
AD195-218Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S421?
S421 is a FILTER,RADIO FREQUENCY INTERFERE.
What parts can replace S421?
There are 15 known substitutes for S421: A321, 406446, 8177310 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S421?
S421 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3040-00-980-0727. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026