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Technical Data Sheet
427018 ✓ 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,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: HEXAGON, nut_height: 0.402 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN, thread_class: 2B, 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 (FLIS) under NSN 5310-00-042-7018, 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
427018
NSN: 5310-00-042-7018
FSC: 5310
CAGE: 21450 — ARMY WEAPONS COMMAND ATTN AMSWE-REE-S (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleHEXAGON
nut_height0.402 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.7880 INCHES MINIMUM AND 0.8125 INCHES MAXIMUM IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch13
nondefinitive_spec/std_dataA TYPE
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-042-7018
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 427018 · 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
WIDTH ACROSS FLATS: 0.7880 INCHES MINIMUM AND 0.8125 INCHES MAXIMUM IN
NUT HEIGHT: 0.402 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH: 13
BEARING SURFACE TYPE: WASHER FACED
NOMINAL THREAD SIZE: 0.500 INCHES IN
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTION: RIGHT-HAND
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.7880 INCHES MINIMUM AND 0.8125 INCHES MAXIMUM IN
NUT HEIGHT0.402 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH13
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.500 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
MATERIALSTEEL CORROSION RESISTING OVERALL
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
337B1Interchangeable
interchangeable cross-reference
interchangeable
82328Interchangeable
interchangeable cross-reference
interchangeable
3271376Interchangeable
interchangeable cross-reference
interchangeable
FFB571ATYPEAInterchangeable
Same NIIN cross-reference
interchangeable
FFB571TYPEAInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 427018?
427018 is a NUT,PLAIN,HEXAGON.
What parts can replace 427018?
There are 5 known substitutes for 427018: 337B1, 82328, 3271376 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 427018?
427018 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-042-7018. This indicates validated use in U.S. government and defense supply chains.
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