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273802 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

273802: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL COMP 1010 OVERALL, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), overall_height: 0.281 INCHES MINIMUM AND 0.304 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN, special_features: 24 FLANGE SERRATIONS EQUALLY SPACED/SERR.HEIGHT 0.009/SERR.LENGTH 0.051. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-461-8049, 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
273802
NSN: 5310-01-461-8049
FSC: 5310 — Nuts and Washers
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_height0.281 INCHES MINIMUM AND 0.304 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
special_features24 FLANGE SERRATIONS EQUALLY SPACED/SERR.HEIGHT 0.009/SERR.LENGTH 0.051
thread_directionRIGHT-HAND
washer_thickness0.025 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN
surface_treatmentZINC OVERALL
width_across_flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
washer_outside_diameter0.686 INCHES MINIMUM AND 0.706 INCHES MAXIMUM IN
NSN5310-01-461-8049
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 273802 · 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: 0.686 INCHES MINIMUM AND 0.706 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
WASHER THICKNESS: 0.025 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.281 INCHES MINIMUM AND 0.304 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.686 INCHES MINIMUM AND 0.706 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
WASHER THICKNESS0.025 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
SPECIAL FEATURES24 FLANGE SERRATIONS EQUALLY SPACED/SERR.HEIGHT 0.009/SERR.LENGTH 0.051
SURFACE TREATMENTZINC OVERALL
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

No substitute or cross-reference records for this part.

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 273802?
273802 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for 273802?
273802 is cataloged in the U.S. Government catalog under NSN 5310-01-461-8049. 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.