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Technical Data Sheet
PartsTable / COMPONENT / 20-4000
20-4000 ✓ 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 20-4000 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-220-6668, 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
20-4000
NSN: 5310-00-220-6668
FSC: 5310
CAGE: 06853 — BENDIX COMMERCIAL VEHICLE SYSTEMS LLC DBA BENDIX COMMERCIAL VEHICLE SYSTEMS (USA)
SPECIFICATIONS
Part Number20-4000
NSN5310-00-220-6668
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 20-4000 · 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 CLASS: 3B
•
NUT STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 1.437 INCHES NOMINAL IN
•
THREAD SERIES: UNS
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 14
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3B
NUT STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS1.437 INCHES NOMINAL IN
THREAD SERIESUNS
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH14
NOMINAL THREAD SIZE1.000 INCHES IN
MATERIALSTEEL OVERALL
NUT HEIGHT0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
4-113-59Interchangeable
interchangeable cross-reference
interchangeable
55443Interchangeable
interchangeable cross-reference
interchangeable
3024601-1Interchangeable
interchangeable cross-reference
interchangeable
11167Interchangeable
interchangeable cross-reference
interchangeable
01-0102-1167Interchangeable
interchangeable cross-reference
interchangeable
417036-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20-4000?
20-4000 is a 20-4000.
What parts can replace 20-4000?
There are 16 known substitutes for 20-4000: 4-113-59, 55443, 3024601-1 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20-4000?
20-4000 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-220-6668. 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