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92018A540 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

92018A540: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, temp_rating: 250.0 FAHRENHEIT MAXIMUM DEGF, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), overall_height: 0.563 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-591-8641, 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
92018A540
NSN: 5310-01-591-8641
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
temp_rating250.0 FAHRENHEIT MAXIMUM DEGF
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_height0.563 INCHES NOMINAL IN
hardness_rating28.0 ROCKWELL B MAXIMUM
thread_directionRIGHT-HAND
washer_thickness0.140 INCHES NOMINAL IN
surface_treatmentCHROMATE OVERALL
width_across_flats0.750 INCHES NOMINAL IN
nominal_thread_size0.500 INCHES IN
NSN5310-01-591-8641
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 92018A540 · 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: 1.070 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
TEMP RATING: 250.0 FAHRENHEIT MAXIMUM DEGF
•
HARDNESS RATING: 28.0 ROCKWELL B MAXIMUM
•
WASHER THICKNESS: 0.140 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.563 INCHES NOMINAL IN
WASHER OUTSIDE DIAMETER1.070 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
TEMP RATING250.0 FAHRENHEIT MAXIMUM DEGF
HARDNESS RATING28.0 ROCKWELL B MAXIMUM
WASHER THICKNESS0.140 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.500 INCHES IN
SURFACE TREATMENTCHROMATE 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 92018A540?
92018A540 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What is the NSN for 92018A540?
92018A540 is cataloged in the U.S. Government catalog under NSN 5310-01-591-8641. 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.