The Bell Crank, cataloged under National Stock Number 3040-00-004-9727, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-004-9727 |
| Primary Part Number | A51G20578-2 |
| Item Name | Bell Crank |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Center to Center Distance Between Fulcrum and Arm End Hole/slot/ball | 0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM FIRST END IN |
| Center to Center Distance Between Fulcrum and Arm End Hole/slot/ball | 4.490 INCHES MINIMUM AND 4.510 INCHES MAXIMUM SECOND END IN |
| Bore Length | 1.802 INCHES MINIMUM AND 1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM1.822 INCHES MAXIMUM IN |
| Criticality Code Justification | ABXVABXV |
| Material Document and Classification | MIL-A-22771, ALLOY 7075 T73 MIL SPEC SINGLE MATERIAL RESPONSE |
| Features Provided | BEARINGBEARING |
| Bore Diameter | 0.437 INCHES NOMINAL0.437 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| A51G20578-2 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| A51G20578-2 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51G20578-2 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
NSN 3040-00-004-9727 is a Bell Crank, manufactured by Northrop Grumman Systems Corporation, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-004-9727 has 1 manufacturer part number on file: A51G20578-2 (Northrop Grumman Systems Corporation).
Key specifications for A51G20578-2: Center to Center Distance Between Fulcrum and Arm End Hole/slot/ball: 0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM FIRST END IN; Center to Center Distance Between Fulcrum and Arm End Hole/slot/ball: 4.490 INCHES MINIMUM AND 4.510 INCHES MAXIMUM SECOND END IN; Bore Length: 1.802 INCHES MINIMUM AND 1.802 INCHES MINIMUM AND 1.822 INCHES MAXIMUM1.822 INCHES MAXIMUM IN; Criticality Code Justification: ABXVABXV. 8 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.