The Shaft,straight, cataloged under National Stock Number 3040-01-252-8444, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Secs Inc. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3040-01-252-8444 |
| Primary Part Number | SS139 |
| Item Name | Shaft,straight |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Secs Inc |
| Status | ACTIVE |
| Surface Finish | 10.0 MICROINCHES |
| First End Diameter | 0.2495 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM IN |
| First End Style | PLAIN |
| End Similarity | IDENTICAL |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| SS139 PRIMARY | Secs Inc (USA) |
| A3-40 PRIMARY | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| 7X1-08-40 | Designatronics Inc Div Stock Drive Products (USA) |
| G4-32 | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| Reference | Meaning |
|---|---|
| AAS-A4-25 | 5/9 Secondary reference Nordex Inc |
| S4-40 | 5/9 Secondary reference W. M. Berg, Inc. |
| 728 | 5/9 Secondary reference Allied Devices Corp Dba Absolute Precision Co |
NSN 3040-01-252-8444 is a Shaft,straight, manufactured by Secs Inc, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-252-8444 has 4 manufacturer part numbers on file: SS139 (Secs Inc), A3-40 (Roller Bearing Co of America, Inc Div Pic Design), 7X1-08-40 (Designatronics Inc Div Stock Drive Products), G4-32 (Designatronics Incorporated Div Sterling Instruments Div).
Key specifications for SS139: Surface Finish: 10.0 MICROINCHES; First End Diameter: 0.2495 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM IN; First End Style: PLAIN; Overall Length: 3.090 INCHES MINIMUM AND 4.010 INCHES MAXIMUM IN. 5 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.