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2D1-03978 — GEARSHAFT,SPUR

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

2D1-03978: GEARSHAFT,SPUR.

The GEARSHAFT,SPUR is a the manufacturer industrial component. Key specifications include face_width: 6.250 INCHES NOMINAL IN, shaft_type: SHOULDERED, gear_material: STEEL COMP 4820, overall_length: 16.250 INCHES NOMINAL IN, pressure_angle: 25.0000 DEGREES, shaft_end_size: 3.545 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 3040-01-449-0218, 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
2D1-03978
NSN: 3040-01-449-0218
FSC: 3040 — Miscellaneous Power Transmission Equipment
CAGE: 34712 — LAKE SHORE SYSTEMS, INC. (USA)
SPECIFICATIONS
face_width6.250 INCHES NOMINAL IN
shaft_typeSHOULDERED
gear_materialSTEEL COMP 4820
overall_length16.250 INCHES NOMINAL IN
pressure_angle25.0000 DEGREES
shaft_end_size3.545 INCHES IN
shaft_end_typePLAIN
shaft_materialSTEEL COMP 4820
teeth_quantity25
diametral_pitch3
hardness_rating55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM TEETH
special_featuresSPHERICAL ROLLER BEARING ON EACH SHAFT END; KEYWAY LOCATED IN LARGEST SHAFT OD 1.25 WIDE BY .625 DEEP
NSN3040-01-449-0218
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available GEARSHAFT,SPUR TITLE COMPONENT PN 2D1-03978 MFR GEARSHAFT,SPUR
KEY FEATURES
•
SHAFT TYPE: SHOULDERED
•
SHAFT MATERIAL: STEEL COMP 4820
•
SHAFT LARGEST DIAMETER: 4.750 INCHES NOMINAL IN
•
SHAFT END SIZE: 3.545 INCHES IN
•
TEETH QUANTITY: 25
•
DIAMETRAL PITCH: 3
•
GEAR OUTSIDE DIAMETER: 8.988 INCHES MINIMUM AND 9.000 INCHES MAXIMUM IN
•
LONGER SHAFT SEGMENT LENGTH: 4.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHAFT TYPESHOULDERED
SHAFT MATERIALSTEEL COMP 4820
SHAFT LARGEST DIAMETER4.750 INCHES NOMINAL IN
SHAFT END SIZE3.545 INCHES IN
TEETH QUANTITY25
DIAMETRAL PITCH3
GEAR OUTSIDE DIAMETER8.988 INCHES MINIMUM AND 9.000 INCHES MAXIMUM IN
LONGER SHAFT SEGMENT LENGTH4.000 INCHES NOMINAL IN
HARDNESS RATING55.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM TEETH
OVERALL LENGTH16.250 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 1
2D3-00293 IT NO 5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2D1-03978?
2D1-03978 is a GEARSHAFT,SPUR.
What parts can replace 2D1-03978?
There is 1 known substitute for 2D1-03978: 2D3-00293 IT NO 5. Substitute compatibility should be verified for your specific system.
What is the NSN for 2D1-03978?
2D1-03978 is cataloged in the U.S. Government catalog under NSN 3040-01-449-0218. 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.