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4181936 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4181936: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNF, overall_height: 0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-653-0068, 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
4181936
NSN: 5310-01-653-0068
NIINs: 016530068, 016587404
FSC: 5310 — Nuts and Washers
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
overall_height0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
locking_featureNYLON INSERT
special_featuresNUT HEX LOCKING-.31-18, DIAMETER-0.31, WIDTH ACCROSS POINTS-0.557, HEX HIGHT-0.250, LOCKING FEATURE-NYLON INSERT
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats0.557 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES IN
NSN5310-01-653-0068
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4181936 · 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
•
WIDTH ACROSS FLATS: 0.557 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS-B18.16.6 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
NUT STYLE: HEXAGON
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.329 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.557 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS-B18.16.6 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SPECIAL FEATURESNUT HEX LOCKING-.31-18, DIAMETER-0.31, WIDTH ACCROSS POINTS-0.557, HEX HIGHT-0.250, LOCKING FEATURE-NYLON INSERT
SURFACE TREATMENTZINC OVERALL
NUT STYLEHEXAGON
END ITEM IDENTIFICATION2320015927353; MRAP - M-ATV
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 4181936?
4181936 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for 4181936?
4181936 is cataloged in the U.S. Government catalog under NSN 5310-01-653-0068. 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.