The Register,air, cataloged under National Stock Number 4520-01-254-7559, 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 Titus Products Div of Philips Industries Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4520-01-254-7559 |
| Primary Part Number | 250R-S1-F5-12.00X12.00 |
| Item Name | Register,air |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Titus Products Div of Philips Industries Inc |
| Status | ACTIVE |
| Fin Spacing | 1.000 INCHES IN |
| Grille Fin Type | ANY ACCEPTABLE |
| Grille Wire Mesh Opening Shape | ANY ACCEPTABLE |
| Shape | SQUARE |
| Frame Type | FLAT |
| Frame Removability | NONREMOVABLE |
| Material | STEEL |
| Grille Quantity | 1 |
| 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 |
|---|---|
| S-201F5-12.00X12.00 | Titus Products Div of Philips Industries Inc (USA) |
| 250R-S1-F5-12.00X12.00 PRIMARY | Titus Products Div of Philips Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| ST60D48 | 7/1 Vendor item drawing reference Lockheed Martin Corp |
| ST60D48-5 | 5/9 Secondary reference Lockheed Martin Corp |
NSN 4520-01-254-7559 is a Register,air, manufactured by Titus Products Div of Philips Industries Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-254-7559 has 2 manufacturer part numbers on file: S-201F5-12.00X12.00 (Titus Products Div of Philips Industries Inc), 250R-S1-F5-12.00X12.00 (Titus Products Div of Philips Industries Inc).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-261-4061. Verify interchangeability with system specifications before substitution.
Key specifications for 250R-S1-F5-12.00X12.00: Fin Spacing: 1.000 INCHES IN; Grille Fin Type: ANY ACCEPTABLE; Grille Wire Mesh Opening Shape: ANY ACCEPTABLE; Shape: SQUARE. 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.