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ENK43ITEM509 ✓ 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: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.688 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-467-9941, 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
ENK43ITEM509
NSN: 5310-00-467-9941
FSC: 5310
CAGE: 88080 — COOPER CAMERON CORP COOPER BESSEMER RECIPROCATING PRODUCTS DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.688 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
width_across_flats0.750 INCHES NOMINAL IN
nominal_thread_size0.500 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch13
NSN5310-00-467-9941
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ENK43ITEM509 · 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 QUANTITY PER INCH: 13
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: FLAT
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
NUT HEIGHT: 0.688 INCHES NOMINAL IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH13
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPEFLAT
NOMINAL THREAD SIZE0.500 INCHES IN
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
NUT HEIGHT0.688 INCHES NOMINAL IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
5300-669500Interchangeable
interchangeable cross-reference
interchangeable
20104Interchangeable
interchangeable cross-reference
interchangeable
16300-125PL ITEM 74Interchangeable
interchangeable cross-reference
interchangeable
G10832-23KInterchangeable
interchangeable cross-reference
interchangeable
18-013-214DUPInterchangeable
interchangeable cross-reference
interchangeable
4087-15938-001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ENK43ITEM509?
ENK43ITEM509 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace ENK43ITEM509?
There are 29 known substitutes for ENK43ITEM509: 5300-669500, 20104, 16300-125PL ITEM 74 and 26 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ENK43ITEM509?
ENK43ITEM509 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-467-9941. 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