The Reducer,air Conditioning-Heating, cataloged under National Stock Number 4520-01-349-9155, 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 General Dynamics Mission Systems, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-349-9155 |
| Primary Part Number | 87023A0031 |
| Item Name | Reducer,air Conditioning-Heating |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | General Dynamics Mission Systems, Inc. |
| Status | ACTIVE |
| Overall Diameter | 11.750 INCHES NOMINAL IN |
| Overall Thickness | 0.063 INCHES NOMINAL IN |
| Style Designator | REDUCING |
| Main Trunk Inlet Diameter | 11.500 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY |
| Fitting Overall Length | 6.120 INCHES NOMINAL IN |
| Main Trunk Reducing Outlet Diameter | 7.620 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 |
|---|---|
| 87023A0031 PRIMARY | General Dynamics Mission Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 87023A0031 | 5/9 Secondary reference Sterling Abrasive Pproducts Co |
| 87023A0031 | 5/9 Secondary reference Brunswick Corp Defense Div |
NSN 4520-01-349-9155 is a Reducer,air Conditioning-Heating, manufactured by General Dynamics Mission Systems, Inc., classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-349-9155 has 1 manufacturer part number on file: 87023A0031 (General Dynamics Mission Systems, Inc.).
Key specifications for 87023A0031: Overall Diameter: 11.750 INCHES NOMINAL IN; Overall Thickness: 0.063 INCHES NOMINAL IN; Style Designator: REDUCING; Overall Length: 6.120 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.