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Technical Data Sheet
PartsTable / COMPONENT / 251539
251539 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
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 part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-045-1988, 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
251539
NSN: 5305-00-045-1988
FSC: 5305
CAGE: H0001 — DAF TRUCKS N.V. (NLD)
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
NSN5305-00-045-1988
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 251539 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD LENGTH: 1.250 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 14
•
NOMINAL THREAD DIAMETER: 0.438 INCHES IN
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL: STEEL OVERALL
•
MINIMUM YIELD STRENGTH: 85000 POUNDS PER SQUARE INCH LBS
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH1.250 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH14
NOMINAL THREAD DIAMETER0.438 INCHES IN
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
MATERIALSTEEL OVERALL
MINIMUM YIELD STRENGTH85000 POUNDS PER SQUARE INCH LBS
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
2603903-40Interchangeable
interchangeable cross-reference
interchangeable
2603903-14Interchangeable
interchangeable cross-reference
interchangeable
2603903-20Interchangeable
interchangeable cross-reference
interchangeable
82-2065-0125Interchangeable
interchangeable cross-reference
interchangeable
MS90728-87Interchangeable
interchangeable cross-reference
interchangeable
5305000711788Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 251539?
251539 is a WASHER,SPRING TENSION.
What parts can replace 251539?
There are 22 known substitutes for 251539: 2603903-40, 2603903-14, 2603903-20 and 19 more. Substitute compatibility should be verified for your specific system.
Is 251539 still available?
251539 is currently cancelled.
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Last verified: July 2026