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2-121-028-03 — NUT,PLAIN,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2-121-028-03: NUT,PLAIN,ROUND.

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: ROUND, nut_diameter: 3.790 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.280 INCHES NOMINAL IN, thread_series: UNS. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-039-6446, 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
2-121-028-03
NSN: 5310-01-039-6446
FSC: 5310 — Nuts and Washers
CAGE: 99193 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - PHOENIX (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleROUND
nut_diameter3.790 INCHES NOMINAL IN
thread_class3B
nut_thickness0.280 INCHES NOMINAL IN
thread_seriesUNS
hardness_rating35.5 ROCKWELL C MINIMUM
thread_directionRIGHT-HAND
countersink_angle90.0 DEGREES NOMINAL NUT
drive_point_depth0.075 INCHES NOMINAL IN
drive_point_width0.380 INCHES NOMINAL IN
surface_treatmentSILVER OVERALL
NSN5310-01-039-6446
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2-121-028-03 · 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
•
HARDNESS RATING: 35.5 ROCKWELL C MINIMUM
•
DRIVE POINT WIDTH: 0.380 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 3.281 INCHES IN
•
NUT DIAMETER: 3.790 INCHES NOMINAL IN
•
COUNTERBORE DIAMETER: 3.310 INCHES NOMINAL NUT IN
•
DRIVE POINT DEPTH: 0.075 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUNS
HARDNESS RATING35.5 ROCKWELL C MINIMUM
DRIVE POINT WIDTH0.380 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE3.281 INCHES IN
NUT DIAMETER3.790 INCHES NOMINAL IN
COUNTERBORE DIAMETER3.310 INCHES NOMINAL NUT IN
DRIVE POINT DEPTH0.075 INCHES NOMINAL IN
NUT THICKNESS0.280 INCHES NOMINAL IN
SURFACE TREATMENTSILVER 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2-121-028-03?
2-121-028-03 is a NUT,PLAIN,ROUND.
What is the NSN for 2-121-028-03?
2-121-028-03 is cataloged in the U.S. Government catalog under NSN 5310-01-039-6446. 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.