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639299 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

639299: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 1137 OVERALL, nut_style: DOUBLE HEXAGON, temp_rating: 550.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.314 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-576-5559, 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
639299
NSN: 5310-00-576-5559
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 1137 OVERALL
nut_styleDOUBLE HEXAGON
temp_rating550.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.314 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
special_featuresCHROMIC ACID DIPPED
thread_directionRIGHT-HAND
washer_thickness0.070 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
width_across_flats0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
NSN5310-00-576-5559
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 639299 · 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: 0.443 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
TEMP RATING: 550.0 FAHRENHEIT NOMINAL DEGF
•
WASHER THICKNESS: 0.070 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI1137 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.314 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.443 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
TEMP RATING550.0 FAHRENHEIT NOMINAL DEGF
WASHER THICKNESS0.070 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI1137 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 6
372873Reference document
Same NSN cross-reference
Reference document — Secondary reference
372872Reference document
Same NSN cross-reference
Reference document — Secondary reference
69415-428Reference document
Same NSN cross-reference
Reference document — Secondary reference
D52Z1835-048Reference document
Same NSN cross-reference
Reference document — Secondary reference
53546-428S9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
B00100-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 639299?
639299 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 639299?
There are 6 known substitutes for 639299: 372873, 372872, 69415-428 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 639299?
639299 is cataloged in the U.S. Government catalog under NSN 5310-00-576-5559. This indicates validated use in U.S. government and defense supply chains.
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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.