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91839A031 — NUT,SELF-LOCKING,CASTELLATED,HEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

91839A031: NUT,SELF-LOCKING,CASTELLATED,HEX.

NUT,SELF-LOCKING,CASTELLATED,HEX. Key specifications include nut_style: CASTELLATED, HEXAGON, nut_height: 0.462 INCHES NOMINAL IN, temp_rating: 800.0 FAHRENHEIT MAXIMUM DEGF, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-305-9502, 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
91839A031
NSN: 5310-01-305-9502
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303CU OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304H OR STEEL COMP 304L OVERALL
nut_styleCASTELLATED, HEXAGON
nut_height0.462 INCHES NOMINAL IN
temp_rating800.0 FAHRENHEIT MAXIMUM DEGF
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
width_across_flats0.564 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch16
NSN5310-01-305-9502
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91839A031 · 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: 0.564 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
TEMP RATING: 800.0 FAHRENHEIT MAXIMUM DEGF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
•
NUT HEIGHT: 0.462 INCHES NOMINAL IN
•
NUT STYLE: CASTELLATED, HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.564 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
TEMP RATING800.0 FAHRENHEIT MAXIMUM DEGF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.462 INCHES NOMINAL IN
NUT STYLECASTELLATED, HEXAGON
THREAD CLASS2B
THREAD QUANTITY PER INCH16
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91839A031?
91839A031 is a NUT,SELF-LOCKING,CASTELLATED,HEX.
What is the NSN for 91839A031?
91839A031 is cataloged in the U.S. Government catalog under NSN 5310-01-305-9502. This indicates validated use in U.S. government and defense supply chains.
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