PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 218139451
218139451 ✓ 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 5305-01-729-2627, 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
218139451
NSN: 5305-01-729-2627
FSC: 5305
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
Part Number218139451
NSN5305-01-729-2627
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 218139451 · 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 24
440-8843168-84Interchangeable
interchangeable cross-reference
interchangeable
R4342501-84Interchangeable
interchangeable cross-reference
interchangeable
8843168Interchangeable
interchangeable cross-reference
interchangeable
218125519Interchangeable
interchangeable cross-reference
interchangeable
440-8843168-83Interchangeable
interchangeable cross-reference
interchangeable
LOA036473-83Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 218139451?
218139451 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 218139451?
There are 24 known substitutes for 218139451: 440-8843168-84, R4342501-84, 8843168 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 218139451?
218139451 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-729-2627. 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