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PartsTable / COMPONENT / 124-1900973 PART NO. 51
124-1900973 PART NO. 51 ✓ 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 124-1900973 PART NO. 51 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 5310-01-477-2318, 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
124-1900973 PART NO. 51
NSN: 5310-01-477-2318
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number124-1900973 PART NO. 51
NSN5310-01-477-2318
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 124-1900973 PART NO. 51 · 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
•
THREAD CLASS: 2B
•
THREAD QUANTITY PER INCH: 9
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.875 INCHES IN
•
MATERIAL: COPPER ALLOY OVERALL
•
WIDTH ACROSS FLATS: 1.269 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
THREAD QUANTITY PER INCH9
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.875 INCHES IN
MATERIALCOPPER ALLOY OVERALL
WIDTH ACROSS FLATS1.269 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN
NUT STYLEHEXAGON
THREAD DIRECTIONLEFT-HAND
NUT HEIGHT0.724 INCHES MINIMUM AND 0.776 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
1900973Interchangeable
interchangeable cross-reference
interchangeable
02363-7Interchangeable
interchangeable cross-reference
interchangeable
124-1900973 PART NO. 50Interchangeable
interchangeable cross-reference
interchangeable
124-1900973 PART NO. 42Interchangeable
interchangeable cross-reference
interchangeable
124-5589510 PC 7Interchangeable
interchangeable cross-reference
interchangeable
124-1900973 PART NO. 21Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 124-1900973 PART NO. 51?
124-1900973 PART NO. 51 is a 124-1900973 PART NO. 51.
What parts can replace 124-1900973 PART NO. 51?
There are 7 known substitutes for 124-1900973 PART NO. 51: 1900973, 02363-7, 124-1900973 PART NO. 50 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 124-1900973 PART NO. 51?
124-1900973 PART NO. 51 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-477-2318. 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