The Register,air, cataloged under National Stock Number 4520-01-278-9930, 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 8 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-278-9930 |
| Primary Part Number | SMC-201-77 ITEM 5 + 6 |
| Item Name | Register,air |
| 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 |
| Blade Spacing | 5.375 INCHES AND 3.125 INCHES IN |
| Shape | RECTANGULAR |
| Blade Quantity | 11 |
| Frame Removability | ANY ACCEPTABLE |
| Deflector Blade Operating Method | CONTROL BAR |
| Material | STEEL CORROSION RESISTING |
| Blade Vertical Surface Axis Position | VERTICAL |
| Grille Quantity | 12 |
| 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 54 X 60 IN | Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton (USA) |
| SMC-201-77 ITEM 5 + 6 PRIMARY | Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton (USA) |
| SMC-102-77 PRIMARY | Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton (USA) |
NSN 4520-01-278-9930 is a Register,air, 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 4520-01-278-9930 has 3 manufacturer part numbers on file: SMC-201-77 54 X 60 IN (Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton), SMC-201-77 ITEM 5 + 6 (Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton), SMC-102-77 (Spiral Metals Corporation of Baton Rouge Dba Spiral Metals Corp of Baton Rouge Div Spiral Metals Corp of Baton).
Key specifications for SMC-201-77 ITEM 5 + 6: Overall Height: 60.000 INCHES NOMINAL IN; Blade Spacing: 5.375 INCHES AND 3.125 INCHES IN; Shape: RECTANGULAR; Overall Width: 54.000 INCHES NOMINAL IN. 8 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.