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Technical Data Sheet
4A521 ✓ 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

MODIFICATION KIT,TELEPHONE EQUIP. Key specifications include thickness: 0.152 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN, lining_style: CLUTCH DISK, major_diameter: 5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN, minor_diameter: 2.750 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN, application_type: DRY, attachment_method: RIVETED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2530-00-363-6542, 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
4A521
NSN: 2530-00-363-6542
FSC: 2530
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
thickness0.152 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
lining_styleCLUTCH DISK
major_diameter5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
minor_diameter2.750 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN
application_typeDRY
attachment_methodRIVETED
features_providedRIGID FRICTION LINING
fabrication_methodWOVEN
hole_arrangement_styleSTAGGERED
surface_condition_and_locationBOTH SIDES GROUND
circular_pattern_hole_type_and_quantity3 COUNTERBORED INNER SECURING CIRCLE
NSN2530-00-363-6542
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available MODIFICATION KIT,TELEPHONE EQUIP TITLE COMPONENT PN 4A521 MFR MODIFICATION KIT,TELEP
KEY FEATURES
SUPPLEMENTARY FEATURES: THIS ITEM HAS BEEN REVIEWED FOR ASBESTOS MATERIAL. THE CURRENT APPROVED SOURCES 11083 HAVE INDICATED THIER PART NUMBER CONTAINED ASBESTOS PRIOR TO 8 4. THEY CONTINUE TO MANUFACTURE THE SAME PART NUMBER WITHOUT ASBESTOS MATERIAL AFTER 1984
ATTACHMENT METHOD: RIVETED
CIRCULAR PATTERN HOLE TYPE AND QUANTITY: 3 COUNTERBORED OUTER SECURING CIRCLE
MAJOR DIAMETER: 5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
FABRICATION METHOD: WOVEN
SURFACE CONDITION AND LOCATION: BOTH SIDES GROUND
FEATURES PROVIDED: RIGID FRICTION LINING
LINING STYLE: CLUTCH DISK
TECHNICAL CHARACTERISTICS (FLIS)
SUPPLEMENTARY FEATURESTHIS ITEM HAS BEEN REVIEWED FOR ASBESTOS MATERIAL. THE CURRENT APPROVED SOURCES 11083 HAVE INDICATED THIER PART NUMBER CONTAINED ASBESTOS PRIOR TO 8 4. THEY CONTINUE TO MANUFACTURE THE SAME PART NUMBER WITHOUT ASBESTOS MATERIAL AFTER 1984
ATTACHMENT METHODRIVETED
CIRCULAR PATTERN HOLE TYPE AND QUANTITY3 COUNTERBORED OUTER SECURING CIRCLE
MAJOR DIAMETER5.469 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN
FABRICATION METHODWOVEN
SURFACE CONDITION AND LOCATIONBOTH SIDES GROUND
FEATURES PROVIDEDRIGID FRICTION LINING
LINING STYLECLUTCH DISK
MINOR DIAMETER2.750 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN
APPLICATION TYPEDRY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
193832812Interchangeable
interchangeable cross-reference
interchangeable
30182-4-4Interchangeable
interchangeable cross-reference
interchangeable
H1957500Interchangeable
interchangeable cross-reference
interchangeable
19575Interchangeable
interchangeable cross-reference
interchangeable
M 518Interchangeable
interchangeable cross-reference
interchangeable
NT4X43KAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4A521?
4A521 is a MODIFICATION KIT,TELEPHONE EQUIP.
What parts can replace 4A521?
There are 9 known substitutes for 4A521: 193832812, 30182-4-4, H1957500 and 6 more. Substitute compatibility should be verified for your specific system.
Is 4A521 still available?
4A521 is currently cancelled.
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