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PartsTable / COMPONENT / WK251539
WK251539 ✓ 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,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1070 AND STEEL COMP 1095 OVERALL, hole_diameter: 2.160 INCHES NOMINAL IN, outside_diameter: 2.381 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL, material_thickness: 0.026 INCHES NOMINAL IN, end_item_identification: W/S: AIRCRAFT, GALAXY C-5. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-437-9434, 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
WK251539
NSN: 5310-00-437-9434
FSC: 5310
CAGE: 70472 — BARNES GROUP INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1070 AND STEEL COMP 1095 OVERALL
hole_diameter2.160 INCHES NOMINAL IN
outside_diameter2.381 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
material_thickness0.026 INCHES NOMINAL IN
end_item_identificationW/S: AIRCRAFT, GALAXY C-5
surface_treatment_document_and_classificationWK522001,TY 2,CL 2,FSCM 33525 MFR REF SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-437-9434
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: WK251539 · 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: 2.160 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 1070 AND STEEL COMP 1095 OVERALL
•
OUTSIDE DIAMETER: 2.381 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.026 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: WK522001,TY 2,CL 2,FSCM 33525 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER2.160 INCHES NOMINAL IN
MATERIALSTEEL COMP 1070 AND STEEL COMP 1095 OVERALL
OUTSIDE DIAMETER2.381 INCHES NOMINAL IN
MATERIAL THICKNESS0.026 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONWK522001,TY 2,CL 2,FSCM 33525 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
END ITEM IDENTIFICATIONW/S: AIRCRAFT, GALAXY C-5
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
251539Interchangeable
interchangeable cross-reference
interchangeable
L6497-52Interchangeable
interchangeable cross-reference
interchangeable
W100711-4HTCAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is WK251539?
WK251539 is a WASHER,SPRING TENSION.
What parts can replace WK251539?
There are 3 known substitutes for WK251539: 251539, L6497-52, W100711-4HTCA. Substitute compatibility should be verified for your specific system.
What is the NSN for WK251539?
WK251539 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-437-9434. 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