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21549624 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21549624: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include thread_length: 0.312 INCHES NOMINAL IN, fastener_length: 18.000 INCHES NOMINAL IN, end_item_identification: ALCO251 ENGINE. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-470-1064, 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
21549624
NSN: 5305-01-470-1064
FSC: 5305 — Screws
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
thread_length0.312 INCHES NOMINAL IN
fastener_length18.000 INCHES NOMINAL IN
end_item_identificationALCO251 ENGINE
NSN5305-01-470-1064
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21549624 · 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
•
FASTENER LENGTH: 18.000 INCHES NOMINAL IN
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH18.000 INCHES NOMINAL IN
THREAD LENGTH0.312 INCHES NOMINAL IN
END ITEM IDENTIFICATIONALCO251 ENGINE
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21549624?
21549624 is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for 21549624?
21549624 is cataloged in the U.S. Government catalog under NSN 5305-01-470-1064. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.