The Clamp,hub, cataloged under National Stock Number 3040-01-440-4658, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Sea Systems Command. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3040-01-440-4658 |
| Primary Part Number | 561-6404325-191 |
| Item Name | Clamp,hub |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Plain Hole Diameter | 0.5000 INCHES NOMINAL IN |
| Clamp Securing Hole Style | THREADED |
| Style Designator | ROUND SECTIONAL, TWO BOLT SECURED |
| Material Document and Classification | QQ-S-763, CLASS 304 FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 5.5000 INCHES NOMINAL IN |
| Nominal Thread Size | 0.164 INCHES IN |
| Screw Thread Series Designator | UNF |
| Surface Treatment | CHROMIUM |
| Bore Diameter | 2.2500 INCHES NOMINAL IN |
| Material | STEEL COMP 304 |
| Thickness | 0.5000 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 |
|---|---|
| 561-6404325-191 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6404325 | D/9 Drawing number reference only Naval Sea Systems Command |
| DF2018-470#191 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| DF2018-470 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 3040-01-440-4658 is a Clamp,hub, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-440-4658 has 1 manufacturer part number on file: 561-6404325-191 (Naval Sea Systems Command).
Key specifications for 561-6404325-191: Plain Hole Diameter: 0.5000 INCHES NOMINAL IN; Clamp Securing Hole Style: THREADED; Style Designator: ROUND SECTIONAL, TWO BOLT SECURED; Material Document and Classification: QQ-S-763, CLASS 304 FED SPEC SINGLE MATERIAL RESPONSE. 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.