The Gearshaft,spur, cataloged under National Stock Number 3040-00-944-1875, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-944-1875 |
| Primary Part Number | 555543 |
| Item Name | Gearshaft,spur |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Shaft Material | STEEL |
| Teeth Quantity | 37 |
| Diametral Pitch | 9 |
| Gear Outside Diameter | 4.175 INCHES NOMINAL IN |
| Gear Material | STEEL |
| Pressure Angle | 22.5000 DEGREES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 555543 | Equitable Engineering Company Inc. (USA) |
| 555543 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 555543 | Bmt Aerospace Usa, Inc. (USA) |
| 555543 | Arrow Gear Llc (USA) |
| Reference | Meaning |
|---|---|
| 555543 | 5/9 Secondary reference Glenco-Star |
| 555543 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 3040-00-944-1875 is a Gearshaft,spur, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-944-1875 has 4 manufacturer part numbers on file: 555543 (Equitable Engineering Company Inc.), 555543 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 555543 (Bmt Aerospace Usa, Inc.), 555543 (Arrow Gear Llc).
1 possible match (shared part number, not a government interchangeability claim): 1240-01-605-7114. Verify interchangeability with system specifications before substitution.
Key specifications for 555543: Shaft Material: STEEL; Teeth Quantity: 37; Diametral Pitch: 9; Gear Outside Diameter: 4.175 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.