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90043A030 — NUT,PLAIN,SQUARE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

90043A030: NUT,PLAIN,SQUARE.

The NUT,PLAIN,SQUARE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: SQUARE, nut_height: 0.266 INCHES NOMINAL IN, special_features: SCREW SIZE 5/16"-18, thread_direction: RIGHT-HAND, width_across_flats: 0.563 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-551-6691, 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
90043A030
NSN: 5310-01-551-6691
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.266 INCHES NOMINAL IN
special_featuresSCREW SIZE 5/16"-18
thread_directionRIGHT-HAND
width_across_flats0.563 INCHES NOMINAL IN
end_item_identificationNSN: 3990-01-444-5196
part_name_assigned_by_controlling_agencyCROWNED SQUARE NUT
NSN5310-01-551-6691
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 90043A030 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.563 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 0.266 INCHES NOMINAL IN
•
NUT STYLE: SQUARE
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.563 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.266 INCHES NOMINAL IN
SPECIAL FEATURESSCREW SIZE 5/16"-18
PART NAME ASSIGNED BY CONTROLLING AGENCYCROWNED SQUARE NUT
NUT STYLESQUARE
END ITEM IDENTIFICATIONNSN: 3990-01-444-5196
MATERIALSTEEL OVERALL
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
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 90043A030?
90043A030 is a NUT,PLAIN,SQUARE.
What is the NSN for 90043A030?
90043A030 is cataloged in the U.S. Government catalog under NSN 5310-01-551-6691. 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.