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4057795 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4057795: 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: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.290 INCHES NOMINAL IN, locking_feature: FREE-RUNNING ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-155-6760, 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
4057795
NSN: 5310-01-155-6760
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.290 INCHES NOMINAL IN
locking_featureFREE-RUNNING ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.040 INCHES NOMINAL IN
width_across_flats0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
counterbore_diameter0.270 INCHES MINIMUM AND 0.280 INCHES MAXIMUM LOCKING INSERT IN
nut_counterbore_depth0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM LOCKING INSERT IN
NSN5310-01-155-6760
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4057795 · 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: 0.550 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
WASHER THICKNESS: 0.040 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NUT COUNTERBORE DEPTH: 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM LOCKING INSERT IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.290 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER0.550 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.367 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
WASHER THICKNESS0.040 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NUT COUNTERBORE DEPTH0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM LOCKING INSERT IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
COUNTERBORE DIAMETER0.270 INCHES MINIMUM AND 0.280 INCHES MAXIMUM LOCKING INSERT 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 3
4057828Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310PL1921970Reference document
Same NSN cross-reference
Reference document — Informative reference only
5310PL0751350Reference 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 4057795?
4057795 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 4057795?
There are 3 known substitutes for 4057795: 4057828, 5310PL1921970, 5310PL0751350. Substitute compatibility should be verified for your specific system.
What is the NSN for 4057795?
4057795 is cataloged in the U.S. Government catalog under NSN 5310-01-155-6760. 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.