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PartsTable / COMPONENT / B4030373
B4030373 ✓ 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,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 752 OVERALL, nut_style: HEXAGON, nut_height: 0.380 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-218-1461, 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
B4030373
NSN: 5310-01-218-1461
FSC: 5310
CAGE: 56996 — DEPARTMENT OF THE ARMY HQ UNITED STATES ARMY COMMUNICATIONS RESEARCH AND DEVELOPMENT COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY 752 OVERALL
nut_styleHEXAGON
nut_height0.380 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats1.250 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch18
material_document_and_classificationQQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-218-1461
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B4030373 · 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
•
BEARING SURFACE TYPE: FLAT
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 18
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
NUT HEIGHT: 0.380 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2B
•
WIDTH ACROSS FLATS: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BEARING SURFACE TYPEFLAT
THREAD SERIESUNF
THREAD QUANTITY PER INCH18
NOMINAL THREAD SIZE0.625 INCHES IN
NUT HEIGHT0.380 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
WIDTH ACROSS FLATS1.250 INCHES NOMINAL IN
NUT STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
3190Interchangeable
interchangeable cross-reference
interchangeable
00044Interchangeable
interchangeable cross-reference
interchangeable
C12297Interchangeable
interchangeable cross-reference
interchangeable
110 1-13/32Interchangeable
interchangeable cross-reference
interchangeable
GGG-D-751 TYEInterchangeable
interchangeable cross-reference
interchangeable
18-06042-1MInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B4030373?
B4030373 is a NUT,PLAIN,HEXAGON.
What parts can replace B4030373?
There are 15 known substitutes for B4030373: 3190, 00044, C12297 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B4030373?
B4030373 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-218-1461. 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