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6578520 — SHAFT,SHOULDERED

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

6578520: SHAFT,SHOULDERED.

The SHAFT,SHOULDERED is a the manufacturer industrial component. Key specifications include material: STEEL, end_similarity: NOT IDENTICAL, overall_length: 21.125 INCHES NOMINAL IN, first_end_style: CIRCULAR GROOVED, second_end_style: SPLINED (STRAIGHT), first_end_diameter: 1.9684 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3040-00-657-8520, 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
6578520
NSN: 3040-00-657-8520
FSC: 3040 — Miscellaneous Power Transmission Equipment
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL
step_quantity5
end_similarityNOT IDENTICAL
overall_length21.125 INCHES NOMINAL IN
first_end_styleCIRCULAR GROOVED
second_end_styleSPLINED (STRAIGHT)
first_end_diameter1.9684 INCHES NOMINAL IN
second_end_diameter2.2440 INCHES NOMINAL IN
fsc_application_dataTRANSMISSION INPUT SHAFT,TRACTOR 18 TON
largest_step_diameter3.145 INCHES MINIMUM AND 3.150 INCHES MAXIMUM IN
first_end_groove_width0.1000 INCHES NOMINAL IN
second_end_spline_length3.750 INCHES NOMINAL IN
NSN3040-00-657-8520
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SHAFT,SHOULDERED TITLE COMPONENT PN 6578520 MFR SHAFT,SHOULDERED
KEY FEATURES
•
FSC APPLICATION DATA: TRANSMISSION INPUT SHAFT,TRACTOR 18 TON
•
STEP QUANTITY: 5
•
FIRST END DIAMETER: 1.9684 INCHES NOMINAL IN
•
SECOND END DIAMETER: 2.2440 INCHES NOMINAL IN
•
LARGEST STEP DIAMETER: 3.145 INCHES MINIMUM AND 3.150 INCHES MAXIMUM IN
•
SECOND END SPLINE MINOR DIAMETER: 1.8880 INCHES NOMINAL IN
•
FIRST END STYLE: CIRCULAR GROOVED
•
SECOND END SPLINE MAJOR DIAMETER: 2.2440 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATATRANSMISSION INPUT SHAFT,TRACTOR 18 TON
STEP QUANTITY5
FIRST END DIAMETER1.9684 INCHES NOMINAL IN
SECOND END DIAMETER2.2440 INCHES NOMINAL IN
LARGEST STEP DIAMETER3.145 INCHES MINIMUM AND 3.150 INCHES MAXIMUM IN
SECOND END SPLINE MINOR DIAMETER1.8880 INCHES NOMINAL IN
FIRST END STYLECIRCULAR GROOVED
SECOND END SPLINE MAJOR DIAMETER2.2440 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 3130 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-624,FS4150H FED SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH21.125 INCHES NOMINAL IN
OTHER ITEMS IN FSC 3040 — Miscellaneous Power Transmission Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
3040-00-001-0046 3040-00-001-0047 3040-00-001-0048 3040-00-001-0068 3040-00-001-0077 3040-00-001-0078 3040-00-001-0089 3040-00-001-1224
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6578520?
6578520 is a SHAFT,SHOULDERED.
What is the NSN for 6578520?
6578520 is cataloged in the U.S. Government catalog under NSN 3040-00-657-8520. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.