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21555870 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21555870: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, thread_length: 2.000 INCHES NOMINAL IN, fastener_length: 2.000 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, end_item_identification: DIESEL ENGINE,P/N 251F18MS ONBOARD 270 FT WMEC COAST GUARD VESSELS FT. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-372-8971, 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
21555870
NSN: 5305-01-372-8971
FSC: 5305 — Screws
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
thread_length2.000 INCHES NOMINAL IN
fastener_length2.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
end_item_identificationDIESEL ENGINE,P/N 251F18MS ONBOARD 270 FT WMEC COAST GUARD VESSELS FT
nominal_thread_diameter0.625 INCHES IN
NSN5305-01-372-8971
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21555870 · 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: 2.000 INCHES NOMINAL IN
•
THREAD LENGTH: 2.000 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
FASTENER LENGTH2.000 INCHES NOMINAL IN
THREAD LENGTH2.000 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
END ITEM IDENTIFICATIONDIESEL ENGINE,P/N 251F18MS ONBOARD 270 FT WMEC COAST GUARD VESSELS FT
MATERIALSTEEL OVERALL
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 21555870?
21555870 is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for 21555870?
21555870 is cataloged in the U.S. Government catalog under NSN 5305-01-372-8971. 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.