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PartsTable / COMPONENT / THREADS 1-3/4-5 UNC-2B
THREADS 1-3/4-5 UNC-2B ✓ 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 THREADS 1-3/4-5 UNC-2B 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 5310-01-468-3304, 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
THREADS 1-3/4-5 UNC-2B
NSN: 5310-01-468-3304
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
Part NumberTHREADS 1-3/4-5 UNC-2B
NSN5310-01-468-3304
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: THREADS 1-3/4-5 UNC-2B · 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
•
SURFACE TREATMENT: ZINC OVERALL
•
BEARING SURFACE TYPE: CHAMFERED OR FLAT
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 5
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-Z-325,TYPE II, CLASS II FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTZINC OVERALL
END ITEM IDENTIFICATIONUSED ON NIMITZ CLASS CVN
PART NAME ASSIGNED BY CONTROLLING AGENCYHEAVY HEX JAM NUT
BEARING SURFACE TYPECHAMFERED OR FLAT
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH5
NOMINAL THREAD SIZE1.750 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325,TYPE II, CLASS II FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
WIDTH ACROSS FLATS2.662 INCHES MINIMUM AND 2.750 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
124-4322651 PC 56Interchangeable
interchangeable cross-reference
interchangeable
4322649Interchangeable
interchangeable cross-reference
interchangeable
124-4322649 PC 80Interchangeable
interchangeable cross-reference
interchangeable
124-4322649Interchangeable
interchangeable cross-reference
interchangeable
124-4557340 PC 36Interchangeable
interchangeable cross-reference
interchangeable
124-4322619 PCInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is THREADS 1-3/4-5 UNC-2B?
THREADS 1-3/4-5 UNC-2B is a THREADS 1-3/4-5 UNC-2B.
What parts can replace THREADS 1-3/4-5 UNC-2B?
There are 28 known substitutes for THREADS 1-3/4-5 UNC-2B: 124-4322651 PC 56, 4322649, 124-4322649 PC 80 and 25 more. Substitute compatibility should be verified for your specific system.
What is the NSN for THREADS 1-3/4-5 UNC-2B?
THREADS 1-3/4-5 UNC-2B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-468-3304. 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