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1/2-13UNC-3B (M IL-B-837A GR 2) — Technical Data Sheet

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— · 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,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5310-01-450-5130, 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-837A GR 2)
NSN: 5310-01-450-5130
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch13
NSN5310-01-450-5130
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1/2-13UNC-3B (M IL-B-837A 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 DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
NUT STYLE: HEXAGON
•
THREAD CLASS: 3B
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NUT STYLEHEXAGON
THREAD CLASS3B
MATERIALSTEEL OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD QUANTITY PER INCH13
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
122-2422417 PC 200InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
122-2298838 PC 200InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
122-2422386 PIEInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5310PL1368737InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
NAS1149F0663PInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5310PL1873845InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2-13UNC-3B (M IL-B-837A GR 2)?
1/2-13UNC-3B (M IL-B-837A GR 2) is a NUT,PLAIN,HEXAGON.
What parts can replace 1/2-13UNC-3B (M IL-B-837A GR 2)?
There are 29 known substitutes for 1/2-13UNC-3B (M IL-B-837A GR 2): 122-2422417 PC 200, 122-2298838 PC 200, 122-2422386 PIE and 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/2-13UNC-3B (M IL-B-837A GR 2)?
1/2-13UNC-3B (M IL-B-837A GR 2) is cataloged in the Federal Logistics Information System under NSN 5310-01-450-5130. 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: October 2026