The Shaft,shouldered, cataloged under National Stock Number 3040-01-325-9500, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-325-9500 |
| Primary Part Number | 520-4863665 ITEM 4L1 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES |
| Second End External Thread Length | 0.7500 INCHES NOMINAL IN |
| Step Quantity | 8 |
| First End Diameter | 4.9940 INCHES MINIMUM AND 4.9950 INCHES MAXIMUM IN |
| First End Spline Major Diameter | 4.9940 INCHES MINIMUM AND 4.9950 INCHES MAXIMUM IN |
| Second End Diameter | 3.1100 INCHES NOMINAL IN |
| Largest Step Diameter | 4.9970 INCHES MINIMUM AND 5.0000 INCHES MAXIMUM IN |
| First End Style | SPLINED (STRAIGHT) |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | QQ-N-286,CL A,FORM 2 FED SPEC SINGLE MATERIAL RESPONSE |
| First End Spline Length | 6.5000 INCHES NOMINAL IN |
| First End Spline Quantity | 10 |
| End Similarity | NOT IDENTICAL |
| Second End Style | EXTERNALLY AND INTERNALLY THREADED |
| First End Spline Minor Diameter | 4.2910 INCHES MINIMUM AND 4.2960 INCHES MAXIMUM IN |
| Material | NICKEL ALLOY |
| Second End Internal Thread Length | 1.7500 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 520-4863665 ITEM 4L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 520-4863665 ITEM 4 | 3/1 Design control — primary reference U.S. Government activity |
NSN 3040-01-325-9500 is a Shaft,shouldered, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-325-9500 has 1 manufacturer part number on file: 520-4863665 ITEM 4L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 520-4863665 ITEM 4L1: Surface Finish: 32.0 MICROINCHES; Second End External Thread Length: 0.7500 INCHES NOMINAL IN; Step Quantity: 8; First End Diameter: 4.9940 INCHES MINIMUM AND 4.9950 INCHES MAXIMUM IN. 18 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.
NSN 3040-01-325-9500 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.