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UWN428 — NUT,SELF-LOCKING,INTERNAL WRENCH

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

UWN428: NUT,SELF-LOCKING,INTERNAL WRENCH.

NUT,SELF-LOCKING,INTERNAL WRENCH. Key specifications include material: STEEL OVERALL, nut_style: INTERNAL WRENCHING, nut_height: 0.656 INCHES NOMINAL IN, nut_diameter: 0.531 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-488-8711, 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
UWN428
NSN: 5310-00-488-8711
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleINTERNAL WRENCHING
nut_height0.656 INCHES NOMINAL IN
nut_diameter0.531 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
nominal_thread_size0.250 INCHES IN
width_between_flats0.375 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
internal_drive_styleDOUBLE HEXAGON
NSN5310-00-488-8711
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: UWN428 · 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: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
NUT DIAMETER: 0.531 INCHES NOMINAL IN
•
SPECIFICATION/STANDARD DATA: 81205-NAS443 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
WIDTH BETWEEN FLATS: 0.375 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NUT HEIGHT: 0.656 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
NUT DIAMETER0.531 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81205-NAS443 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
WIDTH BETWEEN FLATS0.375 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.656 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
INTERNAL DRIVE STYLEDOUBLE HEXAGON
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
12B048Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is UWN428?
UWN428 is a NUT,SELF-LOCKING,INTERNAL WRENCH.
What parts can replace UWN428?
There is 1 known substitute for UWN428: 12B048. Substitute compatibility should be verified for your specific system.
What is the NSN for UWN428?
UWN428 is cataloged in the U.S. Government catalog under NSN 5310-00-488-8711. 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.