The Shaft,shouldered, cataloged under National Stock Number 3040-01-485-1815, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 16 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-485-1815 |
| Primary Part Number | 721-7286700-17 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Step Quantity | 4 |
| First End Diameter | 4.9950 INCHES MINIMUM AND 4.9980 INCHES MAXIMUM IN |
| First End Spline Major Diameter | 5.4900 INCHES MINIMUM AND 5.5000 INCHES MAXIMUM IN |
| Second End Diameter | 4.9950 INCHES MINIMUM AND 4.9980 INCHES MAXIMUM IN |
| Largest Step Diameter | 5.490 INCHES MINIMUM AND 5.500 INCHES MAXIMUM IN |
| First End Style | SPLINED (STRAIGHT) |
| Supplementary Features | FIRST END HAS CENTER JACKING HOLE COUNTERBORED AND THREADED .500-13UNC-2B: SECOND END ALSO HAS CENTER HOLE AND THREE (3) HOLES SPACED 120 DEGREES ON 3.750 DIA. CENTERS; HOLES ARE COUNTERSUNK 1.33 0.67 X 90 AND THREADED .625-11UNC-2B TO .87 MIN FULL THREAD: SHAFT HAS 2 SPLINES; 1ST END SPLINE LENGTH 4.500 IN., THEN 11.250 STRAIGHT SHAFT, THEN SECOND SPLINE (SAME SPLINE DATA) 5.00 IN. LONG, LEAVING 8.375 IN. STRAIGHT SHAFT LENGTH 2ND END IN |
| Material Document and Classification | MIL-T-9047 ALY TI-6AL-4V, COND A MIL SPEC SINGLE MATERIAL RESPONSE V |
| First End Spline Length | 4.5000 INCHES NOMINAL IN |
| First End Spline Quantity | 20 |
| End Similarity | NOT IDENTICAL |
| Second End Style | INTERNAL THREADED |
| First End Spline Minor Diameter | 5.0020 INCHES MINIMUM AND 5.0050 INCHES MAXIMUM IN |
| Material | TITANIUM ALLOY |
| Second End Internal Thread Length | 0.870 INCHES NOMINAL IN |
| 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 |
|---|---|
| 721-7286700-17 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7286700 | D/9 Drawing number reference only Naval Sea Systems Command |
| H8611503-0017 | 5/2 Secondary reference U.S. Government activity |
| H861-1503 | D/9 Drawing number reference only U.S. Government activity |
| H861-1503-17 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-01-485-1815 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-485-1815 has 1 manufacturer part number on file: 721-7286700-17 (Naval Sea Systems Command).
8 possible matches (shared part number, not a government interchangeability claim): 3040-01-485-1826, 3130-01-485-7639, 3130-01-485-7645. Verify interchangeability with system specifications before substitution.
Key specifications for 721-7286700-17: Surface Finish: 63.0 MICROINCHES; Step Quantity: 4; First End Diameter: 4.9950 INCHES MINIMUM AND 4.9980 INCHES MAXIMUM IN; First End Spline Major Diameter: 5.4900 INCHES MINIMUM AND 5.5000 INCHES MAXIMUM IN. 16 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.