The Extension Shaft, cataloged under National Stock Number 3040-01-237-0079, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-237-0079 |
| Item Name | Extension Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Socket Diameter | 0.500 INCHES NOMINAL IN |
| Length | 3.500 INCHES NOMINAL IN |
| Socket Depth | 1.500 INCHES NOMINAL IN |
| Style Designator | PLAIN SOCKET |
| Outside Diameter | 1.750 INCHES NOMINAL IN |
| Shaft End Design | MALE |
| Shaft End Diameter | 0.750 INCHES NOMINAL IN |
| Nominal Thread Size | 0.750 INCHES STUD IN |
| Nominal Thread Size | 0.500 INCHES SCREW HOLE IN |
| Thread Quantity Per Inch | 20 SCREW HOLE |
| Thread Quantity Per Inch | 10 STUD |
| Material | STEEL |
| Shoulder Length | 0.625 INCHES NOMINAL IN |
| Thread Series Designator | UNF SCREW HOLE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD |
| End Type | PROCESSED END |
| Shaft End Configuration | FLATTED ROUND |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SSN637-709-2144237 | D/9 Drawing number reference only U.S. Government activity |
| 77832-60X5 PIECE 11 | 3/2 Design control — primary reference U.S. Government activity |
| 77832-60X5 | D/9 Drawing number reference only U.S. Government activity |
| SSN637-709-2144237 PIECE 11 | 5/2 Secondary reference U.S. Government activity |
NSN 3040-01-237-0079 is a Extension Shaft, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3040-01-237-0215. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-237-0079: Socket Diameter: 0.500 INCHES NOMINAL IN; Length: 3.500 INCHES NOMINAL IN; Socket Depth: 1.500 INCHES NOMINAL IN; Style Designator: PLAIN SOCKET. 17 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 3040-01-237-0079 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.