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U0400491 ✓ 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 WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN, outside_diameter: 0.869 INCHES MAXIMUM IN, style_designator: SPLIT HELICAL-RIGHT HAND, surface_treatment: ZINC OVERALL, material_thickness: 0.125 INCHES MINIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-564-3127, 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
U0400491
NSN: 5310-01-564-3127
FSC: 5310
CAGE: F9980 — JIGE INTERNATIONAL (FRA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN
outside_diameter0.869 INCHES MAXIMUM IN
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentZINC OVERALL
material_thickness0.125 INCHES MINIMUM IN
end_item_identificationTOW TRACTOR, AIRCRAFT; TRANSMISSION ASSY; ASSEMBLY, CONVERTER; TOW TRACTOR , A/C (P/N 4JPAV, PCC: 6J9; SPECIAL AIRCRAFT AND ENGINE TOOL AND SUPPORT EQUIPMENT/PARTS
material_document_and_classificationSAE J403 1055-1065 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agency1/2, MEDIUM SPLIT LOCK WASHERS, ZINC PLATED
surface_treatment_document_and_classificationASTM B695, CLASS 5. TYPE 1 (CLEAR) ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-564-3127
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: U0400491 · 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
•
HOLE DIAMETER: 0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
OUTSIDE DIAMETER: 0.869 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.125 INCHES MINIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.502 INCHES MINIMUM AND 0.512 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONTOW TRACTOR, AIRCRAFT; TRANSMISSION ASSY; ASSEMBLY, CONVERTER; TOW TRACTOR , A/C (P/N 4JPAV, PCC: 6J9; SPECIAL AIRCRAFT AND ENGINE TOOL AND SUPPORT EQUIPMENT/PARTS
SURFACE TREATMENTZINC OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
PART NAME ASSIGNED BY CONTROLLING AGENCY1/2, MEDIUM SPLIT LOCK WASHERS, ZINC PLATED
OUTSIDE DIAMETER0.869 INCHES MAXIMUM IN
MATERIAL THICKNESS0.125 INCHES MINIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B695, CLASS 5. TYPE 1 (CLEAR) ASSN STD SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE J403 1055-1065 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
11697426Interchangeable
interchangeable cross-reference
interchangeable
33626Interchangeable
interchangeable cross-reference
interchangeable
32958Interchangeable
interchangeable cross-reference
interchangeable
Y00014949Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is U0400491?
U0400491 is a WASHER,LOCK.
What parts can replace U0400491?
There are 4 known substitutes for U0400491: 11697426, 33626, 32958 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for U0400491?
U0400491 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-564-3127. 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