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Technical Data Sheet
PartsTable / COMPONENT / 3/8-16UNC-3B
3/8-16UNC-3B ✓ 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 3/8-16UNC-3B is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-050-6646, 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
3/8-16UNC-3B
NSN: 5310-00-050-6646
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
Part Number3/8-16UNC-3B
NSN5310-00-050-6646
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3/8-16UNC-3B · 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
•
MATERIAL: STEEL COMP 303 NUT
•
WIDTH ACROSS FLATS: 0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
THREAD QUANTITY PER INCH: 16
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 303 NUT
SPECIAL FEATURESW/NYLON INSERT
WIDTH ACROSS FLATS0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
END ITEM IDENTIFICATIONMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
NOMINAL THREAD SIZE0.375 INCHES IN
THREAD QUANTITY PER INCH16
BEARING SURFACE TYPEFLAT
MATERIALPLASTIC NYLON LOCKING INSERT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
12Z2007-344Interchangeable
interchangeable cross-reference
interchangeable
845-2050999 PIECE 9Interchangeable
interchangeable cross-reference
interchangeable
2640-613Interchangeable
interchangeable cross-reference
interchangeable
845-2050999Interchangeable
interchangeable cross-reference
interchangeable
2640-612Interchangeable
interchangeable cross-reference
interchangeable
845-2050997Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3/8-16UNC-3B?
3/8-16UNC-3B is a 3/8-16UNC-3B.
What parts can replace 3/8-16UNC-3B?
There are 27 known substitutes for 3/8-16UNC-3B: 12Z2007-344, 845-2050999 PIECE 9, 2640-613 and 24 more. Substitute compatibility should be verified for your specific system.
Is 3/8-16UNC-3B still available?
3/8-16UNC-3B is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026