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Technical Data Sheet
PartsTable / COMPONENT / 1/2-13UNC-3B (M IL-B-857A GR-2)
1/2-13UNC-3B (M IL-B-857A GR-2) ✓ 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 (M IL-B-857A GR-2) is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-768-0318, 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 (M IL-B-857A GR-2)
NSN: 5310-00-768-0318
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
Part Number1/2-13UNC-3B (M IL-B-857A GR-2)
NSN5310-00-768-0318
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1/2-13UNC-3B (M IL-B-857A GR-2) · 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 SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 95.0 BRINELL STANDARD MINIMUM
•
WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
THREAD QUANTITY PER INCH: 13
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2; ARMORED MULTI-PURPOSE VEHICLE (AMPV); MULTIPLE LAUNCH ROCKET SYSTEM (MLRS); HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS); LOGISTICS SUPPORT VESSEL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING95.0 BRINELL STANDARD MINIMUM
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD QUANTITY PER INCH13
NOMINAL THREAD SIZE0.500 INCHES IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD CLASS2B
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
MS51967-14Interchangeable
interchangeable cross-reference
interchangeable
5310PL0670188Interchangeable
interchangeable cross-reference
interchangeable
5310000043099Interchangeable
interchangeable cross-reference
interchangeable
102637Interchangeable
interchangeable cross-reference
interchangeable
18317PCM425Interchangeable
interchangeable cross-reference
interchangeable
NH10201Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2-13UNC-3B (M IL-B-857A GR-2)?
1/2-13UNC-3B (M IL-B-857A GR-2) is a 1/2-13UNC-3B (M IL-B-857A GR-2).
What parts can replace 1/2-13UNC-3B (M IL-B-857A GR-2)?
There are 29 known substitutes for 1/2-13UNC-3B (M IL-B-857A GR-2): MS51967-14, 5310PL0670188, 5310000043099 and 26 more. Substitute compatibility should be verified for your specific system.
Is 1/2-13UNC-3B (M IL-B-857A GR-2) still available?
1/2-13UNC-3B (M IL-B-857A GR-2) 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