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33115121 ✓ 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: 0.048 INCHES NOMINAL IN, hole_diameter: 0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN, heat_treatment: QUENCHED AND TEMPERED, overall_diameter: 0.641 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN, features_provided: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-059-8733, 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
33115121
NSN: 5310-00-059-8733
FSC: 5310
CAGE: 03798 — WESTERBEKE CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.048 INCHES NOMINAL IN
hole_diameter0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
heat_treatmentQUENCHED AND TEMPERED
overall_diameter0.641 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-059-8733
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 33115121 · 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
•
OVERALL DIAMETER: 0.641 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
•
FEATURES PROVIDED: CASEHARDENED
•
CENTER HOLE SHAPE STYLE: ROUND
•
HEAT TREATMENT: QUENCHED AND TEMPERED
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.641 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN
FEATURES PROVIDEDCASEHARDENED
CENTER HOLE SHAPE STYLEROUND
HEAT TREATMENTQUENCHED AND TEMPERED
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MATERIALSTEEL OVERALL
HOLE DIAMETER0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
THICKNESS0.048 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
40007Interchangeable
interchangeable cross-reference
interchangeable
1565-9902Interchangeable
interchangeable cross-reference
interchangeable
12622Interchangeable
interchangeable cross-reference
interchangeable
1007-1Interchangeable
interchangeable cross-reference
interchangeable
6993Interchangeable
interchangeable cross-reference
interchangeable
368035R1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 33115121?
33115121 is a WASHER,FLAT.
What parts can replace 33115121?
There are 9 known substitutes for 33115121: 40007, 1565-9902, 12622 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 33115121?
33115121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-059-8733. 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