The Shaft,straight, cataloged under National Stock Number 3040-01-220-0034, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-220-0034 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| First End Diameter | 0.9970 INCHES MINIMUM AND 0.9980 INCHES MAXIMUM IN |
| First End Spline Major Diameter | 0.9970 INCHES MINIMUM AND 0.9980 INCHES MAXIMUM IN |
| First End Style | SPLINED (STRAIGHT) |
| Material Document and Classification | QQ-N-281 CLASS A FED SPEC SINGLE MATERIAL RESPONSE |
| First End Spline Length | 3.750 INCHES NOMINAL IN |
| First End Spline Quantity | 10 |
| End Similarity | IDENTICAL |
| First End Spline Minor Diameter | 0.8490 INCHES MINIMUM AND 0.8540 INCHES MAXIMUM IN |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SSN637-505-2143924 PIECE 10 | 5/2 Secondary reference U.S. Government activity |
| 77656-31X6 PIECE 10 | 3/2 Design control — primary reference U.S. Government activity |
| 77656-31X6 | D/9 Drawing number reference only U.S. Government activity |
| SSN637-505-2143924 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-220-0034 is a Shaft,straight, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-220-0036, 3040-01-220-0039. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-220-0034: First End Diameter: 0.9970 INCHES MINIMUM AND 0.9980 INCHES MAXIMUM IN; First End Spline Major Diameter: 0.9970 INCHES MINIMUM AND 0.9980 INCHES MAXIMUM IN; First End Style: SPLINED (STRAIGHT); Material Document and Classification: QQ-N-281 CLASS A FED SPEC SINGLE MATERIAL RESPONSE. 9 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.