The Damper,flue, cataloged under National Stock Number 4520-01-273-1393, 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 Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-273-1393 |
| Primary Part Number | SMC-201-77 ITEM 1 |
| Item Name | Damper,flue |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton |
| Status | ACTIVE |
| Mounting Method | SCREW |
| Shape | RECTANGULAR |
| Sheet Metal Gage Size | 14 |
| Length | 60.000 INCHES IN |
| Width | 57.000 INCHES IN |
| Surface Treatment | ZINC AND PASSIVATE |
| Positioning Holder Type | FRICTION |
| Material | STEEL AND STEEL CORROSION RESISTING AND COPPER ALLOY |
| Operation Method | MANUAL |
| 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 |
|---|---|
| SMC-201-77 ITEM 1 PRIMARY | Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton (USA) |
| Reference | Meaning |
|---|---|
| SMC-201-77 | D/9 Drawing number reference only Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton |
NSN 4520-01-273-1393 is a Damper,flue, manufactured by Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-273-1393 has 1 manufacturer part number on file: SMC-201-77 ITEM 1 (Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-305-2359. Verify interchangeability with system specifications before substitution.
Key specifications for SMC-201-77 ITEM 1: Overall Height: 60.000 INCHES NOMINAL IN; Mounting Method: SCREW; Shape: RECTANGULAR; Overall Width: 63.000 INCHES NOMINAL IN. 9 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.