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12549143 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

12549143: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.320 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 2.500 INCHES NOMINAL IN, fastener_length: 2.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-357-8362, 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
12549143
NSN: 5305-01-357-8362
FSC: 5305 — Screws
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.320 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
thread_class2A A
thread_length2.500 INCHES NOMINAL IN
fastener_length2.500 INCHES NOMINAL IN
special_featuresSCREW SHALL HAVE FULL FORM THREADS EXTENDING TO WITHIN 2 THREADS OF THEBEARING SURFACE OF THE HEAD; HYDROGEN EMBRITTLEMENT RELIEF MANDATORY
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
end_item_identificationM1A2 TANK
nominal_thread_diameter0.500 INCHES IN
NSN5305-01-357-8362
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12549143 · 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
•
HEAD HEIGHT: 0.320 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-STD-171,TY2CL3 MIL STD SINGLE TREATMENT RESPONSE OR QQ-P-416 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 2.500 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.320 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
FASTENER LENGTH2.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-STD-171,TY2CL3 MIL STD SINGLE TREATMENT RESPONSE OR QQ-P-416 FED SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH2.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
SPECIAL FEATURESSCREW SHALL HAVE FULL FORM THREADS EXTENDING TO WITHIN 2 THREADS OF THEBEARING SURFACE OF THE HEAD; HYDROGEN EMBRITTLEMENT RELIEF MANDATORY
SURFACE TREATMENTCADMIUM OVERALL
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12549143?
12549143 is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for 12549143?
12549143 is cataloged in the U.S. Government catalog under NSN 5305-01-357-8362. 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.