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6521031 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

6521031: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, nut_style: ROUND, nut_diameter: 2.683 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.344 INCHES NOMINAL IN, thread_series: UNS. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-208-8939, 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
6521031
NSN: 5310-00-208-8939
FSC: 5310 — Nuts and Washers
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
nut_styleROUND
nut_diameter2.683 INCHES NOMINAL IN
thread_class3B
nut_thickness0.344 INCHES NOMINAL IN
thread_seriesUNS
thread_directionRIGHT-HAND
drive_point_depth0.084 INCHES NOMINAL IN
drive_point_width0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
nominal_thread_size2.000 INCHES IN
drive_point_quantity8
NSN5310-00-208-8939
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 6521031 · 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
•
THREAD SERIES: UNS
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 2.000 INCHES IN
•
NUT DIAMETER: 2.683 INCHES NOMINAL IN
•
DRIVE POINT DEPTH: 0.084 INCHES NOMINAL IN
•
NUT THICKNESS: 0.344 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUNS
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE2.000 INCHES IN
NUT DIAMETER2.683 INCHES NOMINAL IN
DRIVE POINT DEPTH0.084 INCHES NOMINAL IN
NUT THICKNESS0.344 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
DRIVE POINT QUANTITY8
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6521031?
6521031 is a NUT,PLAIN,ROUND.
What is the NSN for 6521031?
6521031 is cataloged in the U.S. Government catalog under NSN 5310-00-208-8939. 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.