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Technical Data Sheet
PartsTable / COMPONENT / 1/2-13UNC-3B (MIL-N-25027)
1/2-13UNC-3B (MIL-N-25027) ✓ 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 1/2-13UNC-3B (MIL-N-25027) 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 5310-01-418-3846, 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
1/2-13UNC-3B (MIL-N-25027)
NSN: 5310-01-418-3846
FSC: 5310
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
Part Number1/2-13UNC-3B (MIL-N-25027)
NSN5310-01-418-3846
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1/2-13UNC-3B (MIL-N-25027) · 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 DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD QUANTITY PER INCH: 13
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
THREAD SERIES: UNJC
•
MATERIAL: NICKEL ALLOY OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD QUANTITY PER INCH13
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD SERIESUNJC
MATERIALNICKEL ALLOY OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3B
WIDTH ACROSS FLATS0.865 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
6002-154 PIECE 5Interchangeable
interchangeable cross-reference
interchangeable
211070742Interchangeable
interchangeable cross-reference
interchangeable
6404856 FIND 15L1Interchangeable
interchangeable cross-reference
interchangeable
87412-0803IT7-37Interchangeable
interchangeable cross-reference
interchangeable
2643-820-88-ITEM NO-26L1Interchangeable
interchangeable cross-reference
interchangeable
595-7067876-36Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2-13UNC-3B (MIL-N-25027)?
1/2-13UNC-3B (MIL-N-25027) is a 1/2-13UNC-3B (MIL-N-25027).
What parts can replace 1/2-13UNC-3B (MIL-N-25027)?
There are 16 known substitutes for 1/2-13UNC-3B (MIL-N-25027): 6002-154 PIECE 5, 211070742, 6404856 FIND 15L1 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/2-13UNC-3B (MIL-N-25027)?
1/2-13UNC-3B (MIL-N-25027) is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-418-3846. 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