FSC: 3040 — Miscellaneous Power Transmission Equipment
FSG: 30 — Mechanical Power Transmission Equipment
General Description
The Gearshaft,spur, cataloged under National Stock Number 3040-00-021-0504, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
3040-00-021-0504
Item Name
Gearshaft,spur
FSC / FSG
3040 / 30 — Miscellaneous Power Transmission Equipment
Status
ACTIVE
Shaft Largest Diameter
0.187 INCHES NOMINAL IN
Teeth Quantity
70
Diametral Pitch
96
Gear Outside Diameter
0.750 INCHES NOMINAL IN
Pressure Angle
20.0000 DEGREES
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4730-00-208-178021602-2POSSIBLE MATCH
COUPLING,BOSS
Possible match (shared part number)Rockwell Collins Inc
2915-01-068-3033216021POSSIBLE MATCH
HOUSING,FILTER BY-PASS VALVE
Possible match (shared part number)Eaton Corp Dba Eaton Aerospace Jackson
4730-01-170-532121602-2POSSIBLE MATCH
COUPLING,BOSS
Possible match (shared part number)Rockwell Collins Inc
4730-01-229-129721602-1POSSIBLE MATCH
ADAPTER,STRAIGHT,FLANGE TO BOSS
Possible match (shared part number)Parker-Hannifin Corporation Div Stratoflex Products Division Coupling Business Unit
3040-01-579-903621602-1POSSIBLE MATCH
HOUSING,MECHANICAL DRIVE
Possible match (shared part number)Eaton Corporation Div Eaton Fluid Power
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
216021
3/2Design control — primary reference
U.S. Government activity
Related Parts
4730-00-208-1780POSSIBLE MATCH
COUPLING,BOSS
21602-2
2915-01-068-3033POSSIBLE MATCH
HOUSING,FILTER BY-PASS VALVE
216021
4730-01-170-5321POSSIBLE MATCH
COUPLING,BOSS
21602-2
4730-01-229-1297POSSIBLE MATCH
ADAPTER,STRAIGHT,FLANGE TO BOSS
21602-1
3040-01-579-9036POSSIBLE MATCH
HOUSING,MECHANICAL DRIVE
21602-1
Frequently Asked Questions
What is NSN 3040-00-021-0504?
NSN 3040-00-021-0504 is a Gearshaft,spur, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
What NSN replaces 3040-00-021-0504?
5 possible matches (shared part number, not a government interchangeability claim): 4730-00-208-1780, 2915-01-068-3033, 4730-01-170-5321. Verify interchangeability with system specifications before substitution.
What are the specifications of 3040-00-021-0504?
Key specifications for 3040-00-021-0504: Shaft Largest Diameter: 0.187 INCHES NOMINAL IN; Teeth Quantity: 70; Diametral Pitch: 96; Gear Outside Diameter: 0.750 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.
Is NSN 3040-00-021-0504 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.