The Stem,fluid Valve, cataloged under National Stock Number 4820-01-537-0251, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Nibco Inc Chemtrol Div. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-537-0251 |
| Primary Part Number | S-235-Y PT 4 .50IN |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nibco Inc Chemtrol Div |
| Status | ACTIVE |
| Valve Type for Which Designed | GLOBE |
| Valve Model Number for Which Designed | 235-Y |
| Material Document and Classification | ASTM B371 AL C69400/C69430 ASSN STD SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Material | COPPER ALLOY |
| 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-235-Y PT 4 .50IN PRIMARY | Nibco Inc Chemtrol Div (USA) |
| T003723 FC | Nibco Inc Chemtrol Div (USA) |
| Reference | Meaning |
|---|---|
| T003723 FC | 3/9 Design control — primary reference Nibco Inc |
| S-235-Y PT 4 .50IN | 5/9 Secondary reference Nibco Inc |
NSN 4820-01-537-0251 is a Stem,fluid Valve, manufactured by Nibco Inc Chemtrol Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-0251 has 2 manufacturer part numbers on file: S-235-Y PT 4 .50IN (Nibco Inc Chemtrol Div), T003723 FC (Nibco Inc Chemtrol Div).
Key specifications for S-235-Y PT 4 .50IN: Valve Type for Which Designed: GLOBE; Valve Model Number for Which Designed: 235-Y; Material Document and Classification: ASTM B371 AL C69400/C69430 ASSN STD SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 0.500 INCHES IN. 5 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.