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PartsTable / COMPONENT / 91831A030
91831A030 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include special_features: 1/16 INCH IN, part_name_assigned_by_controlling_agency: NUT, PLAIN, HEXAGON. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-499-3569, 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
91831A030
NSN: 5310-01-499-3569
FSC: 5310
CAGE: 2V507 — MCMASTER-CARR SUPPLY COMPANY (USA)
SPECIFICATIONS
special_features1/16 INCH IN
part_name_assigned_by_controlling_agencyNUT, PLAIN, HEXAGON
NSN5310-01-499-3569
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91831A030 · 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
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: FLAT
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 384 OR STEEL COMP 302B OR STEEL COMP 303MA OR STEEL COMP 303SE OR STEEL COMP 304L OVERALL
•
WIDTH ACROSS FLATS: 0.502 INCHES NOMINAL IN
•
THREAD CLASS: 2B
•
TEMP RATING: 250.0 FAHRENHEIT MAXIMUM DEGF
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPEFLAT
NOMINAL THREAD SIZE0.312 INCHES IN
MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 384 OR STEEL COMP 302B OR STEEL COMP 303MA OR STEEL COMP 303SE OR STEEL COMP 304L OVERALL
WIDTH ACROSS FLATS0.502 INCHES NOMINAL IN
THREAD CLASS2B
TEMP RATING250.0 FAHRENHEIT MAXIMUM DEGF
THREAD QUANTITY PER INCH18
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
20487Interchangeable
interchangeable cross-reference
interchangeable
255262-48Interchangeable
interchangeable cross-reference
interchangeable
AN3106A18-20PInterchangeable
interchangeable cross-reference
interchangeable
01217150Interchangeable
interchangeable cross-reference
interchangeable
20487-1Interchangeable
interchangeable cross-reference
interchangeable
13814N PC NO 5 P/N 20487Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91831A030?
91831A030 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 91831A030?
There are 10 known substitutes for 91831A030: 20487, 255262-48, AN3106A18-20P and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91831A030?
91831A030 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-499-3569. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026