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91166A290 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 2.5 MILLIMETERS NOMINAL MM, hole_diameter: 13.0 MILLIMETERS NOMINAL MM, overall_diameter: 24.0 MILLIMETERS NOMINAL MM, special_features: C1006-C1015 W/HARDNESS OF ROCKWELL B49, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-509-6339, 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
91166A290
NSN: 5310-01-509-6339
FSC: 5310
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness2.5 MILLIMETERS NOMINAL MM
hole_diameter13.0 MILLIMETERS NOMINAL MM
overall_diameter24.0 MILLIMETERS NOMINAL MM
special_featuresC1006-C1015 W/HARDNESS OF ROCKWELL B49
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationAIR INTAKE
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-509-6339
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91166A290 · 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
•
PERIPHERAL SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 24.0 MILLIMETERS NOMINAL MM
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
HOLE DIAMETER: 13.0 MILLIMETERS NOMINAL MM
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
PERIPHERAL SHAPE STYLEROUND
OVERALL DIAMETER24.0 MILLIMETERS NOMINAL MM
CENTER HOLE SHAPE STYLEROUND
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
HOLE DIAMETER13.0 MILLIMETERS NOMINAL MM
END ITEM IDENTIFICATIONAIR INTAKE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
THICKNESS2.5 MILLIMETERS NOMINAL MM
SPECIAL FEATURESC1006-C1015 W/HARDNESS OF ROCKWELL B49
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
L140125Interchangeable
interchangeable cross-reference
interchangeable
91166A290Interchangeable
interchangeable cross-reference
interchangeable
L140125-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91166A290?
91166A290 is a WASHER,FLAT.
What parts can replace 91166A290?
There are 3 known substitutes for 91166A290: L140125, 91166A290, L140125-12. Substitute compatibility should be verified for your specific system.
What is the NSN for 91166A290?
91166A290 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-509-6339. 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