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PartsTable / COMPONENT / 8599166-012
8599166-012 ✓ 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 OVERALL, nut_style: HEXAGON, nut_height: 0.148 INCHES MINIMUM AND 0.161 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 (FLIS) under NSN 5310-00-826-5964, 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
8599166-012
NSN: 5310-00-826-5964
FSC: 5310
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
nut_styleHEXAGON
nut_height0.148 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.423 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
nominal_thread_size0.216 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch24
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-826-5964
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8599166-012 · 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
•
WIDTH ACROSS FLATS: 0.423 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
•
BEARING SURFACE TYPE: CHAMFERED
•
NOMINAL THREAD SIZE: 0.216 INCHES IN
•
THREAD QUANTITY PER INCH: 24
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NUT HEIGHT: 0.148 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 303 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.423 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE0.216 INCHES IN
THREAD QUANTITY PER INCH24
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NUT HEIGHT0.148 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN
MATERIALSTEEL COMP 303 OVERALL
THREAD CLASS3B
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
317875-50Interchangeable
interchangeable cross-reference
interchangeable
86012Interchangeable
interchangeable cross-reference
interchangeable
G1A-317875-50Interchangeable
interchangeable cross-reference
interchangeable
2256803PC1Interchangeable
interchangeable cross-reference
interchangeable
860-12MFInterchangeable
interchangeable cross-reference
interchangeable
L1510Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8599166-012?
8599166-012 is a NUT,PLAIN,HEXAGON.
What parts can replace 8599166-012?
There are 12 known substitutes for 8599166-012: 317875-50, 86012, G1A-317875-50 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8599166-012?
8599166-012 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-826-5964. 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