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PartsTable / COMPONENT / AN340C416
AN340C416 ✓ 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 OR STEEL COMP 303S OR STEEL COMP 303SE OVERALL, nut_style: HEXAGON, nut_height: 0.178 INCHES MINIMUM AND 0.193 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 5310-00-176-8120, 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
AN340C416
NSN: 5310-00-176-8120
FSC: 5310
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OR STEEL COMP 303S OR STEEL COMP 303SE OVERALL
nut_styleHEXAGON
nut_height0.178 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.423 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch20
material_document_and_classificationMIL-S-7720 COMP FS MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-7720 COMP FS MIL SPEC 3RD MATERIAL RESPONSE OVERALL
NSN5310-00-176-8120
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN340C416 · 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)
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
THREAD QUANTITY PER INCH: 20
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 0.423 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 COMP FS MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-7720 COMP FS MIL SPEC 3RD MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD QUANTITY PER INCH20
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.423 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 COMP FS MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-7720 COMP FS MIL SPEC 3RD MATERIAL RESPONSE OVERALL
MATERIALSTEEL CORROSION RESISTING OR STEEL COMP 303S OR STEEL COMP 303SE OVERALL
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
13218E0320-291Interchangeable
interchangeable cross-reference
interchangeable
70217Interchangeable
interchangeable cross-reference
interchangeable
MS35649-225AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN340C416?
AN340C416 is a NUT,PLAIN,HEXAGON.
What parts can replace AN340C416?
There are 3 known substitutes for AN340C416: 13218E0320-291, 70217, MS35649-225A. Substitute compatibility should be verified for your specific system.
What is the NSN for AN340C416?
AN340C416 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-176-8120. 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