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PartsTable / COMPONENT / 1576AS781-5
1576AS781-5 ✓ 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 COMP 303 AND STEEL COMP 304 OVERALL, nut_style: HEXAGON, nut_height: 0.500 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-259-7007, 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
1576AS781-5
NSN: 5310-01-259-7007
FSC: 5310
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 303 AND STEEL COMP 304 OVERALL
nut_styleHEXAGON
nut_height0.500 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.250 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES IN
thread_quantity_per_inch32
material_document_and_classificationQQ-S-764 COND A ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-763D COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-F-14072-E300 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-259-7007
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1576AS781-5 · 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
•
NUT STYLE: HEXAGON
•
NUT HEIGHT: 0.500 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 COND A ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-763D COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 303 AND STEEL COMP 304 OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-F-14072-E300 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
NUT HEIGHT0.500 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.138 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 COND A ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-763D COND A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 303 AND STEEL COMP 304 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072-E300 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD QUANTITY PER INCH32
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTPASSIVATE OVERALL
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
3489Interchangeable
interchangeable cross-reference
interchangeable
9086Interchangeable
interchangeable cross-reference
interchangeable
291286Interchangeable
interchangeable cross-reference
interchangeable
S1446Interchangeable
interchangeable cross-reference
interchangeable
SH20AInterchangeable
interchangeable cross-reference
interchangeable
TN33Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1576AS781-5?
1576AS781-5 is a NUT,PLAIN,HEXAGON.
What parts can replace 1576AS781-5?
There are 28 known substitutes for 1576AS781-5: 3489, 9086, 291286 and 25 more. Substitute compatibility should be verified for your specific system.
Is 1576AS781-5 still available?
1576AS781-5 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