The Shaft,straight, cataloged under National Stock Number 3040-00-972-8890, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-972-8890 |
| Primary Part Number | 631A551-001 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| Status | ACTIVE |
| First End Tongue Thickness | 0.375 INCHES NOMINAL IN |
| Second End External Thread Length | 0.625 INCHES NOMINAL IN |
| First End Diameter | 0.6250 INCHES NOMINAL IN |
| First End Tongue Width | 0.872 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN |
| First End Step Length | 1.250 INCHES NOMINAL IN |
| Second End Diameter | 0.6250 INCHES NOMINAL IN |
| First End Style | TONGUE |
| End Similarity | NOT IDENTICAL |
| Second End Style | EXTERNAL THREADED |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 631A551-001 PRIMARY | Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions (USA) |
| Reference | Meaning |
|---|---|
| 631A55-1 | 5/9 Secondary reference General Electric Company |
| 631A551-001 | 5/9 Secondary reference General Electric Co Naval and Drive Turbine Systems Dept |
| 631A551 PIECE 1 | C/1 Advisory reference — outside the item-of-supply concept General Electric Company |
| 631A551-1 | 5/9 Secondary reference General Electric Company |
| 631A551-1 | 5/9 Secondary reference General Electric Company |
| 631A551-001 | 3/9 Design control — primary reference Siemens Government Technologies, Inc. Dba Sgt Dresser-Rand Div Sgt Dresser-Rand |
| 631A551-001 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions |
| 631A551PC1 | 5/9 Secondary reference General Electric Company |
NSN 3040-00-972-8890 is a Shaft,straight, manufactured by Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-972-8890 has 1 manufacturer part number on file: 631A551-001 (Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions).
1 possible match (shared part number, not a government interchangeability claim): 2825-01-088-5115. Verify interchangeability with system specifications before substitution.
Key specifications for 631A551-001: First End Tongue Thickness: 0.375 INCHES NOMINAL IN; Second End External Thread Length: 0.625 INCHES NOMINAL IN; First End Diameter: 0.6250 INCHES NOMINAL IN; First End Tongue Width: 0.872 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN. 10 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.