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PartsTable / COMPONENT / 12759-00631
12759-00631 ✓ 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 OVERALL, nut_style: HEXAGON, nut_height: 7.6 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM, surface_treatment: ZINC OVERALL, width_across_flats: 12.7 MILLIMETERS MINIMUM AND 13.0 MILLIMETERS MAXIMUM MM, nominal_thread_size: 8.0 MILLIMETERS MM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-557-0550, 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
12759-00631
NSN: 5310-01-557-0550
FSC: 5310
CAGE: 0Y3H3 — FASTENAL COMPANY DBA FASTENAL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height7.6 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM
thread_seriesM
surface_treatmentZINC OVERALL
width_across_flats12.7 MILLIMETERS MINIMUM AND 13.0 MILLIMETERS MAXIMUM MM
nominal_thread_size8.0 MILLIMETERS MM
end_item_identificationSPECIAL AIRCRAFT AND ENGINE TOOL AND SUPPORT EQUIPMENT/PARTS; TOW TRACROR, AIRCRAFT; ASSEMBLY FRONT WIPE; TOW TRACTOR, A/C (P/N 4JPAV, PCC: 6J9); MRAP BUFFALO MK2A2
material_document_and_classificationISO 898-2. CLASS 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyINAVY: NUT, FLANGE M8-1.25
surface_treatment_document_and_classificationASTM F1941M. FE/ZN 3A ASSN STD SINGLE TREATMENT RESPONSE OVERALL A
NSN5310-01-557-0550
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12759-00631 · 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
•
SURFACE TREATMENT: ZINC OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ISO 898-2. CLASS 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941M. FE/ZN 3A ASSN STD SINGLE TREATMENT RESPONSE OVERALL A
•
NUT HEIGHT: 7.6 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM
•
THREAD SERIES: M
•
NUT STYLE: HEXAGON
•
WIDTH ACROSS FLATS: 12.7 MILLIMETERS MINIMUM AND 13.0 MILLIMETERS MAXIMUM MM
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTZINC OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONISO 898-2. CLASS 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM F1941M. FE/ZN 3A ASSN STD SINGLE TREATMENT RESPONSE OVERALL A
NUT HEIGHT7.6 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM
THREAD SERIESM
NUT STYLEHEXAGON
WIDTH ACROSS FLATS12.7 MILLIMETERS MINIMUM AND 13.0 MILLIMETERS MAXIMUM MM
PART NAME ASSIGNED BY CONTROLLING AGENCYINAVY: NUT, FLANGE M8-1.25
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONSPECIAL AIRCRAFT AND ENGINE TOOL AND SUPPORT EQUIPMENT/PARTS; TOW TRACROR, AIRCRAFT; ASSEMBLY FRONT WIPE; TOW TRACTOR, A/C (P/N 4JPAV, PCC: 6J9); MRAP BUFFALO MK2A2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
330673-2Interchangeable
interchangeable cross-reference
interchangeable
Z330673-2Interchangeable
interchangeable cross-reference
interchangeable
TR232WQC2LF175FTCABLEInterchangeable
interchangeable cross-reference
interchangeable
9070-1Interchangeable
interchangeable cross-reference
interchangeable
203185Interchangeable
interchangeable cross-reference
interchangeable
P-761033Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12759-00631?
12759-00631 is a NUT,PLAIN,HEXAGON.
What parts can replace 12759-00631?
There are 7 known substitutes for 12759-00631: 330673-2, Z330673-2, TR232WQC2LF175FTCABLE and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12759-00631?
12759-00631 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-557-0550. 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