The Extension Shaft, cataloged under National Stock Number 3040-01-426-1691, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-426-1691 |
| Item Name | Extension Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Length | 3.250 INCHES NOMINAL IN |
| Internal Thread Length | 0.870 INCHES NOMINAL IN |
| Style Designator | THREADED SOCKET |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE |
| Outside Diameter | 0.563 INCHES NOMINAL IN |
| External Thread Length | 0.750 INCHES NOMINAL IN |
| Shaft End Design | FEMALE AND MALE |
| Nominal Thread Size | 0.562 INCHES SOCKET EXTERNAL IN |
| Thread Quantity Per Inch | 12 SOCKET EXTERNAL |
| Bore Diameter | 0.375 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SOCKET EXTERNAL |
| End Type | PROCESSED END |
| Shaft End Configuration | ROUND |
| Attachment Method | EXTERNAL THREAD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| A3209974 | 3/2 Design control — primary reference U.S. Government activity |
| A3209974 | 5/9 Secondary reference Tri-Ex Tower Corp |
NSN 3040-01-426-1691 is a Extension Shaft, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
Key specifications for 3040-01-426-1691: Length: 3.250 INCHES NOMINAL IN; Internal Thread Length: 0.870 INCHES NOMINAL IN; Style Designator: THREADED SOCKET; Material Document and Classification: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE. 15 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.