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311A-4 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

311A-4: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include voltage_rating_in_volts: 12.0 DC NOMINAL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-222-7241, 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
311A-4
NSN: 5310-00-222-7241
NIINs: 002227241, 013335591
FSC: 5310 — Nuts and Washers
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
voltage_rating_in_volts12.0 DC NOMINAL
NSN5310-00-222-7241
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 311A-4 · 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: 0.938 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
HARDNESS RATING: 27.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
NUT HEIGHT: 0.375 INCHES NOMINAL IN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.938 INCHES NOMINAL IN
THREAD SERIESUNF
HARDNESS RATING27.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.625 INCHES IN
NUT HEIGHT0.375 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD CLASS3B
THREAD QUANTITY PER INCH18
SUBSTITUTES & CROSS-REFERENCES 1
408159Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 311A-4?
311A-4 is a NUT,PLAIN,HEXAGON.
What parts can replace 311A-4?
There is 1 known substitute for 311A-4: 408159. Substitute compatibility should be verified for your specific system.
What is the NSN for 311A-4?
311A-4 is cataloged in the U.S. Government catalog under NSN 5310-00-222-7241. 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.