The Box,duct, cataloged under National Stock Number 4520-01-396-8268, 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 Lockheed Martin Corporation Div Rotary and Mission Systems. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4520-01-396-8268 |
| Primary Part Number | 181A281-2 |
| Item Name | Box,duct |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Lockheed Martin Corporation Div Rotary and Mission Systems |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY 5052-H32 PER QQ-A-250/8 AND 6061-T6 PER QQ-A-250/11 |
| 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 |
|---|---|
| 181A281-2 PRIMARY | Lockheed Martin Corporation Div Rotary and Mission Systems (USA) |
| Reference | Meaning |
|---|---|
| 181A281 | D/9 Drawing number reference only Lockheed Martin Corporation Div Rotary and Mission Systems |
NSN 4520-01-396-8268 is a Box,duct, manufactured by Lockheed Martin Corporation Div Rotary and Mission Systems, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-396-8268 has 1 manufacturer part number on file: 181A281-2 (Lockheed Martin Corporation Div Rotary and Mission Systems).
Key specifications for 181A281-2: Overall Height: 12.750 INCHES NOMINAL IN; General Characteristics Item Description: ALUMINUM ALLOY 5052-H32 PER QQ-A-250/8 AND 6061-T6 PER QQ-A-250/11; Overall Length: 7.250 INCHES NOMINAL IN; Overall Width: 7.000 INCHES NOMINAL 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.