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AES20C375B50BB3031 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AES20C375B50BB3031: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: FLAT FILLISTER, head_height: 0.268 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.543 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, thread_length: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-678-5206, 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
AES20C375B50BB3031
NSN: 5305-01-678-5206
FSC: 5305 — Screws
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleFLAT FILLISTER
head_height0.268 INCHES NOMINAL IN
thread_class2A A
head_diameter0.543 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
thread_length0.375 INCHES NOMINAL IN
fastener_length2.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentALUMINUM AND ZINC OVERALL
width_across_flats0.1875 INCHES NOMINAL IN
width_between_flats0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-01-678-5206
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AES20C375B50BB3031 · 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
•
WIDTH ACROSS FLATS: 0.1875 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.268 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F2833, GRADE 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.375 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A574 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
HEAD STYLE: FLAT FILLISTER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.1875 INCHES NOMINAL IN
HEAD HEIGHT0.268 INCHES NOMINAL IN
FASTENER LENGTH2.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM F2833, GRADE 4 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.375 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A574 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.3125 INCHES IN
HEAD STYLEFLAT FILLISTER
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AES20C375B50BB3031?
AES20C375B50BB3031 is a SCREW,SHOULDER.
What is the NSN for AES20C375B50BB3031?
AES20C375B50BB3031 is cataloged in the U.S. Government catalog under NSN 5305-01-678-5206. 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.