The Disk,valve, cataloged under National Stock Number 4820-01-550-3718, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-550-3718 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE |
| Material | CARBON AND STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 803-2177525-C3XX-77 | 3/1 Design control — primary reference U.S. Government activity |
| 2177525 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-550-3718 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-550-3718: Material Document and Classification: ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE; Special Features: DESIGNED FOR USED ON 0.500 INCH SIZE VALVE IN; Part Name Assigned by Controlling Agency: DISC (STOP VALVES); End Item Identification: USED IN VALVE MARKS AS-53 AND AS-54 ON SSN 637 CLASS. 2 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.