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2634820 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2634820: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: HEXAGON, thread_class: 3B, thread_series: UNJC, overall_height: 0.128 INCHES NOMINAL IN, locking_feature: FREE-RUNNING ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-390-1720, 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
2634820
NSN: 5310-00-390-1720
FSC: 5310 — Nuts and Washers
CAGE: 59501 — UNISON INDUSTRIES LLC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
thread_class3B
thread_seriesUNJC
overall_height0.128 INCHES NOMINAL IN
locking_featureFREE-RUNNING ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.010 INCHES NOMINAL IN
width_across_flats0.186 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES IN
washer_outside_diameter0.244 INCHES MAXIMUM IN
thread_quantity_per_inch32
NSN5310-00-390-1720
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2634820 · 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: 0.244 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.186 INCHES NOMINAL IN
•
THREAD SERIES: UNJC
•
WASHER THICKNESS: 0.010 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.128 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER0.244 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.186 INCHES NOMINAL IN
THREAD SERIESUNJC
WASHER THICKNESS0.010 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.138 INCHES IN
LOCKING FEATUREFREE-RUNNING ALL METAL DESIGN
NUT STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 1
10121358Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2634820?
2634820 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 2634820?
There is 1 known substitute for 2634820: 10121358. Substitute compatibility should be verified for your specific system.
What is the NSN for 2634820?
2634820 is cataloged in the U.S. Government catalog under NSN 5310-00-390-1720. 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.