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VN303DH40 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

VN303DH40: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8740 OR STEEL COMP 4340 OR STEEL COMP 4140 OVERALL, nut_style: HEXAGON, nut_height: 0.125 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, temp_rating: 450.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-341-3127, 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
VN303DH40
NSN: 5310-01-341-3127
FSC: 5310 — Nuts and Washers
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OR STEEL COMP 4340 OR STEEL COMP 4140 OVERALL
nut_styleHEXAGON
nut_height0.125 INCHES MAXIMUM IN
lubricationDRY FILM LUBRICANT
temp_rating450.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
hardness_rating36.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
special_featuresLUBRICATION MIL-L-40610
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
NSN5310-01-341-3127
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: VN303DH40 · 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
•
LUBRICATION: DRY FILM LUBRICANT
•
WIDTH ACROSS FLATS: 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
TEMP RATING: 450.0 FAHRENHEIT NOMINAL DEGF
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6378 ASSN STD 3RD MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
TEMP RATING450.0 FAHRENHEIT NOMINAL DEGF
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6378 ASSN STD 3RD MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.112 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
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 4
BACN10JC04CFSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
HS287804Reference document
Same NSN cross-reference
Reference document — Secondary reference
T63440JFAReference document
Same NSN cross-reference
Reference document — Secondary reference
BRH10C04CFReference document
Same NSN cross-reference
Reference document — Secondary reference
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 VN303DH40?
VN303DH40 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace VN303DH40?
There are 4 known substitutes for VN303DH40: BACN10JC04CF, HS287804, T63440JFA and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for VN303DH40?
VN303DH40 is cataloged in the U.S. Government catalog under NSN 5310-01-341-3127. 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.