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PartsTable / COMPONENT / 4491143-65
4491143-65 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 2A A, fastener_length: 0.500 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, countersink_angle: 82.0 DEGREES NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-537-6094, 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
4491143-65
NSN: 5305-01-537-6094
FSC: 5305
CAGE: 17283 — BEK, INC. DBA LEVEL 1 FASTENERS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
head_styleFLAT COUNTERSUNK
thread_class2A A
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
end_item_identificationMAST ANTENNA SYSTEM ANBRA34
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNF
criticality_code_justificationZZZY
material_document_and_classificationQQ-N-281, CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5305-01-537-6094
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4491143-65 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: QUALITY ASSURANCE TESTED FOR SUBMARINE ANTENNA APPLICATION
•
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSQUALITY ASSURANCE TESTED FOR SUBMARINE ANTENNA APPLICATION
END ITEM IDENTIFICATIONMAST ANTENNA SYSTEM ANBRA34
CRITICALITY CODE JUSTIFICATIONZZZY
PART NAME ASSIGNED BY CONTROLLING AGENCYMAST FAIRING ASSEMBLY (DRAWING NAME)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
FF-S-86 TYPE IVInterchangeable
interchangeable cross-reference
interchangeable
7094234-4Interchangeable
interchangeable cross-reference
interchangeable
0.250-28UNF-2A X 0.500Interchangeable
interchangeable cross-reference
interchangeable
4491143-65SQInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4491143-65?
4491143-65 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 4491143-65?
There are 4 known substitutes for 4491143-65: FF-S-86 TYPE IV, 7094234-4, 0.250-28UNF-2A X 0.500 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4491143-65?
4491143-65 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-537-6094. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026