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420728 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

420728: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.280 INCHES NOMINAL IN, thread_class: 2B, thread_series: NPT, locking_feature: SELF-LOCKING. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-582-1253, 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
420728
NSN: 5310-01-582-1253
FSC: 5310 — Nuts and Washers
CAGE: 0Y3H3 — FASTENAL COMPANY DBA FASTENAL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.280 INCHES NOMINAL IN
thread_class2B
thread_seriesNPT
locking_featureSELF-LOCKING
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats0.812 INCHES NOMINAL IN
nominal_thread_size0.5625 INCHES IN
bearing_surface_typeCHAMFERED
end_item_identification2355-01-552-5199 MRAP COUGAR
NSN5310-01-582-1253
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 420728 · 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: 0.812 INCHES NOMINAL IN
•
THREAD SERIES: NPT
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.5625 INCHES IN
•
LOCKING FEATURE: SELF-LOCKING
•
NUT HEIGHT: 0.280 INCHES NOMINAL IN
•
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.812 INCHES NOMINAL IN
THREAD SERIESNPT
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.5625 INCHES IN
LOCKING FEATURESELF-LOCKING
NUT HEIGHT0.280 INCHES NOMINAL IN
SURFACE TREATMENTZINC OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYBULDHEAD LOCK NUT
NUT STYLEHEXAGON
THREAD CLASS2B
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 1
12759-00953Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 420728?
420728 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 420728?
There is 1 known substitute for 420728: 12759-00953. Substitute compatibility should be verified for your specific system.
What is the NSN for 420728?
420728 is cataloged in the U.S. Government catalog under NSN 5310-01-582-1253. 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.