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J979P03A — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

J979P03A: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.290 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN, special_features: CRIT FIT RESTRICTIONS, TOL OR APPLICATION. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-036-3814, 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
J979P03A
NSN: 5310-01-036-3814
FSC: 5310 — Nuts and Washers
CAGE: 11815 — SPS TECHNOLOGIES, LLC DBA CHERRY AEROSPACE DIV DIV CHERRY AEROSPACE (USA)
SPECIFICATIONS
nut_styleDOUBLE HEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.290 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
special_featuresCRIT FIT RESTRICTIONS, TOL OR APPLICATION
thread_directionRIGHT-HAND
washer_thickness0.04 INCHES MINIMUM AND 0.06 INCHES MAXIMUM IN
precious_materialSILVER
surface_treatmentSILVER OVERALL
width_across_flats0.250 INCHES NOMINAL IN
nominal_thread_size0.190 INCHES IN
NSN5310-01-036-3814
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: J979P03A · 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
•
WASHER OUTSIDE DIAMETER: 0.330 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 5709 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
PRECIOUS MATERIAL: SILVER
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
WASHER THICKNESS: 0.04 INCHES MINIMUM AND 0.06 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.290 INCHES MINIMUM AND 0.305 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.330 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 5709 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
PRECIOUS MATERIALSILVER
CRITICALITY CODE JUSTIFICATIONFEAT
WASHER THICKNESS0.04 INCHES MINIMUM AND 0.06 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
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 7
J979P03Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
J979P03DReference document
Same NSN cross-reference
Reference document — Secondary reference
H50184-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
H501184-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
H1207W-1032Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310PL0784339Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is J979P03A?
J979P03A is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace J979P03A?
There are 7 known substitutes for J979P03A: J979P03, J979P03D, H50184-3 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for J979P03A?
J979P03A is cataloged in the U.S. Government catalog under NSN 5310-01-036-3814. 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.