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NS203299 — NUT,SELF-LOCKING,PLATE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

NS203299: NUT,SELF-LOCKING,PLATE.

The NUT,SELF-LOCKING,PLATE is a the manufacturer industrial component. Key specifications include nut_style: PLATE, nut_height: 0.313 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, nut_length: 1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN, plate_width: 0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-997-2878, 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
NS203299
NSN: 5310-00-997-2878
FSC: 5310 — Nuts and Washers
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)
SPECIFICATIONS
nut_stylePLATE
nut_height0.313 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
nut_length1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN
plate_width0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
locking_featurePREVAILING TORQUE ALL METAL DESIGN
plate_thickness0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle90.0 DEGREES NOMINAL NUT
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.250 INCHES IN
NSN5310-00-997-2878
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NS203299 · 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
•
PLATE THICKNESS: 0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
•
NUT LENGTH: 1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
PLATE WIDTH: 0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
•
MOUNTING HOLE DIAMETER: 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
PLATE THICKNESS0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
NUT LENGTH1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN
THREAD SERIESUNF
PLATE WIDTH0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
MOUNTING HOLE DIAMETER0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
DISTANCE FROM APERTURE CENTER TO MOUNTING HOLE CENTER0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
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 2
490143Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
D52ZA6636-048Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 NS203299?
NS203299 is a NUT,SELF-LOCKING,PLATE.
What parts can replace NS203299?
There are 2 known substitutes for NS203299: 490143, D52ZA6636-048. Substitute compatibility should be verified for your specific system.
What is the NSN for NS203299?
NS203299 is cataloged in the U.S. Government catalog under NSN 5310-00-997-2878. 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.