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Technical Data Sheet
PartsTable / COMPONENT / 645A560H55
645A560H55 ✓ 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. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-321-3497, 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
645A560H55
NSN: 5305-01-321-3497
FSC: 5305
CAGE: 48306 — NORTHROP GRUMMAN SUPPORT SERVICES CORP (USA)
SPECIFICATIONS
Part Number645A560H55
NSN5305-01-321-3497
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 645A560H55 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
1/4-20 X 1 HEXInterchangeable
interchangeable cross-reference
interchangeable
207-1161P8Interchangeable
interchangeable cross-reference
interchangeable
SPP60-0157Interchangeable
interchangeable cross-reference
interchangeable
MS35307-1/4-20X1IN.Interchangeable
interchangeable cross-reference
interchangeable
AES01C250A00AA9LP7Interchangeable
interchangeable cross-reference
interchangeable
MS35307-308Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 645A560H55?
645A560H55 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 645A560H55?
There are 8 known substitutes for 645A560H55: 1/4-20 X 1 HEX, 207-1161P8, SPP60-0157 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 645A560H55?
645A560H55 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-321-3497. 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