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PartsTable / COMPONENT / 123-5901610 PART 99L1
123-5901610 PART 99L1 ✓ 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,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), special_features: EJECTOR SIGNAL HYDMN OPER AFT, nominal_thread_size: 0.375 INCHES IN, thread_quantity_per_inch: 16. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-312-8111, 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
123-5901610 PART 99L1
NSN: 5310-01-312-8111
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
special_featuresEJECTOR SIGNAL HYDMN OPER AFT
nominal_thread_size0.375 INCHES IN
thread_quantity_per_inch16
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
NSN5310-01-312-8111
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 123-5901610 PART 99L1 · 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
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
•
MATERIAL: NICKEL ALLOY OVERALL
•
THREAD QUANTITY PER INCH: 16
•
THREAD CLASS: 3B
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
NOMINAL THREAD SIZE: 0.375 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
MATERIALNICKEL ALLOY OVERALL
THREAD QUANTITY PER INCH16
THREAD CLASS3B
SPECIAL FEATURESEJECTOR SIGNAL HYDMN OPER AFT
CRITICALITY CODE JUSTIFICATIONZZZY
NOMINAL THREAD SIZE0.375 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
H861-1506-15Interchangeable
interchangeable cross-reference
interchangeable
111-5486615 ITEM 21Interchangeable
interchangeable cross-reference
interchangeable
2633-561-01 PC 219-2Interchangeable
interchangeable cross-reference
interchangeable
845-6556398PC36Interchangeable
interchangeable cross-reference
interchangeable
MS17828-6CInterchangeable
interchangeable cross-reference
interchangeable
709-8540949 ITEM 018-4D4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 123-5901610 PART 99L1?
123-5901610 PART 99L1 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 123-5901610 PART 99L1?
There are 27 known substitutes for 123-5901610 PART 99L1: H861-1506-15, 111-5486615 ITEM 21, 2633-561-01 PC 219-2 and 24 more. Substitute compatibility should be verified for your specific system.
Is 123-5901610 PART 99L1 still available?
123-5901610 PART 99L1 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