The Ring,special, cataloged under National Stock Number 1650-00-445-8156, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1650-00-445-8156 |
| Primary Part Number | GR540AM328 |
| Item Name | Ring,special |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| General Characteristics Item Description | 1.868 IN. ID; 2.132 IN. OD; 0.290 IN. LG 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 |
|---|---|
| GR540AM328 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| CEC401-328 | C. E. Conover & Co., Inc. (USA) |
| Reference | Meaning |
|---|---|
| CE401 | D/9 Drawing number reference only C. E. Conover & Co., Inc. |
NSN 1650-00-445-8156 is a Ring,special, manufactured by Northrop Grumman Systems Corporation, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-00-445-8156 has 2 manufacturer part numbers on file: GR540AM328 (Northrop Grumman Systems Corporation), CEC401-328 (C. E. Conover & Co., Inc.).
Key specifications for GR540AM328: General Characteristics Item Description: 1.868 IN. ID; 2.132 IN. OD; 0.290 IN. LG IN. 1 specification is 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.