The Register,air, cataloged under National Stock Number 4520-01-334-3928, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-334-3928 |
| Primary Part Number | 209658 |
| Item Name | Register,air |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp |
| Status | ACTIVE |
| Bar Adjustability | NONADJUSTABLE |
| Grille Wire Mesh Opening Shape | SQUARE |
| Shape | RECTANGULAR |
| Frame Type | FLAT |
| Grille Bar Position | HORIZONTAL AND VERTICAL |
| Frame Removability | NONREMOVABLE |
| Grille Quantity | 10 |
| 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 |
|---|---|
| 209658 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA) |
| Reference | Meaning |
|---|---|
| 209658 | 5/9 Secondary reference Litton Systems Inc. Div Navigation Systems Division |
NSN 4520-01-334-3928 is a Register,air, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-334-3928 has 1 manufacturer part number on file: 209658 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).
Key specifications for 209658: Bar Adjustability: NONADJUSTABLE; Grille Wire Mesh Opening Shape: SQUARE; Shape: RECTANGULAR; Overall Length: 15.820 INCHES NOMINAL IN. 7 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.