The Shaft,shouldered, cataloged under National Stock Number 3040-01-338-3674, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Krobach Mfg. Corp. Dba Krobach Manufacturing Corp. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-338-3674 |
| Primary Part Number | 1663C90 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Second End Hole Diameter | 0.2500 INCHES NOMINAL IN |
| Step Quantity | 4 |
| First End Diameter | 1.2290 INCHES NOMINAL IN |
| Second End Diameter | 1.2505 INCHES MINIMUM AND 1.2515 INCHES MAXIMUM IN |
| Largest Step Diameter | 1.250 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN |
| First End Style | PLAIN |
| Second End Distance From Hole Center to End | 0.650 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | UNTHREADED CROSS DRILLED |
| Material | STEEL |
| 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 |
|---|---|
| 1663C90 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| 1663C90 H01 | 3/2 Design control — primary reference U.S. Government activity |
| 1663C90 | D/9 Drawing number reference only U.S. Government activity |
| 1387F91 FIND 4 | 5/2 Secondary reference U.S. Government activity |
NSN 3040-01-338-3674 is a Shaft,shouldered, manufactured by Krobach Mfg. Corp. Dba Krobach Manufacturing Corp, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-338-3674 has 1 manufacturer part number on file: 1663C90 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp).
Key specifications for 1663C90: Surface Finish: 63.0 MICROINCHES; Second End Hole Diameter: 0.2500 INCHES NOMINAL IN; Step Quantity: 4; First End Diameter: 1.2290 INCHES NOMINAL IN. 11 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.