PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 0441C0121-57
0441C0121-57 ✓ 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,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_height: 0.250 INCHES NOMINAL IN, head_diameter: 0.750 INCHES NOMINAL IN, fastener_length: 1.000 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, end_item_identification: UNDERWATER COMBAT SYSTEM, H AND SQOK410VISOR UNICORP. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-379-2336, 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
0441C0121-57
NSN: 5305-01-379-2336
FSC: 5305
CAGE: 03538 — LOCKHEED MARTIN CORPORATION DIV RMS (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_height0.250 INCHES NOMINAL IN
head_diameter0.750 INCHES NOMINAL IN
fastener_length1.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
end_item_identificationUNDERWATER COMBAT SYSTEM, H AND SQOK410VISOR UNICORP
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-379-2336
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 0441C0121-57 · 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
•
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD QUANTITY PER INCH: 20
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL COMP 303 OVERALL
•
HEAD DIAMETER: 0.750 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD QUANTITY PER INCH20
FASTENER LENGTH1.000 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL COMP 303 OVERALL
HEAD DIAMETER0.750 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
END ITEM IDENTIFICATIONUNDERWATER COMBAT SYSTEM, H AND SQOK410VISOR UNICORP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
7S9826Interchangeable
interchangeable cross-reference
interchangeable
9417501Interchangeable
interchangeable cross-reference
interchangeable
72136Interchangeable
interchangeable cross-reference
interchangeable
4157Interchangeable
interchangeable cross-reference
interchangeable
C4157Interchangeable
interchangeable cross-reference
interchangeable
4145Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 0441C0121-57?
0441C0121-57 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace 0441C0121-57?
There are 16 known substitutes for 0441C0121-57: 7S9826, 9417501, 72136 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 0441C0121-57?
0441C0121-57 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-379-2336. 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