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PartsTable / COMPONENT / 522C506-020
522C506-020 ✓ 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,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include fastener_length: 5.000 INCHES NOMINAL IN, nominal_thread_diameter: 0.625 INCHES IN, thread_quantity_per_inch: 11, thread_series_designator: UNIFIED NATIONAL COARSE (UNC). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-421-0855, 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
522C506-020
NSN: 5305-01-421-0855
FSC: 5305
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
fastener_length5.000 INCHES NOMINAL IN
nominal_thread_diameter0.625 INCHES IN
thread_quantity_per_inch11
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5305-01-421-0855
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 522C506-020 · 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
•
THREAD QUANTITY PER INCH: 11
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
FASTENER LENGTH: 5.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH11
NOMINAL THREAD DIAMETER0.625 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FASTENER LENGTH5.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
3A7218Interchangeable
interchangeable cross-reference
interchangeable
490695C91Interchangeable
interchangeable cross-reference
interchangeable
3A7281Interchangeable
interchangeable cross-reference
interchangeable
1135E18FN103Interchangeable
Same NIIN cross-reference
interchangeable
B18.2.1Interchangeable
Same NIIN cross-reference
interchangeable
A449-0Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 522C506-020?
522C506-020 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 522C506-020?
There are 6 known substitutes for 522C506-020: 3A7218, 490695C91, 3A7281 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 522C506-020?
522C506-020 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-421-0855. 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