The Shaft,shouldered, cataloged under National Stock Number 3040-01-438-0687, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Lake Shore Systems, Inc.. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-438-0687 |
| Primary Part Number | 2C1-252 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES |
| Step Quantity | 5 |
| First End Diameter | 3.3745 INCHES NOMINAL IN |
| Second End Diameter | 3.3745 INCHES NOMINAL IN |
| Largest Step Diameter | 4.000 INCHES NOMINAL IN |
| Second End Angle Between Keyways | 90.0 DEGREES NOMINAL |
| First End Style | TWO FLAT KEYWAYS |
| Second End Keyway Width | 0.7500 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-633-C-100000 FED SPEC SINGLE MATERIAL RESPONSE |
| First End Keyway Depth | 0.292 INCHES NOMINAL IN |
| Second End Keyway Depth | 0.417 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | TWO FLAT KEYWAYS |
| First End Angle Between Keyways | 90.0 DEGREES NOMINAL |
| Material | STEEL |
| External Keyway Length | 4.312 INCHES NOMINAL SECOND END IN |
| External Keyway Length | 4.562 INCHES NOMINAL FIRST END IN |
| First End Keyway Width | 0.7500 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 |
|---|---|
| 2D3-05667 ITEM 57 | Lake Shore Systems, Inc. (USA) |
| 2C1-252 PRIMARY | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2D3-05667 | D/9 Drawing number reference only Lake Shore Systems, Inc. |
NSN 3040-01-438-0687 is a Shaft,shouldered, manufactured by Lake Shore Systems, Inc., classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-438-0687 has 2 manufacturer part numbers on file: 2D3-05667 ITEM 57 (Lake Shore Systems, Inc.), 2C1-252 (Lake Shore Systems, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-438-3415, 3040-01-438-3790. Verify interchangeability with system specifications before substitution.
Key specifications for 2C1-252: Surface Finish: 32.0 MICROINCHES; Step Quantity: 5; First End Diameter: 3.3745 INCHES NOMINAL IN; Second End Diameter: 3.3745 INCHES NOMINAL 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.
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.