The Cap,valve, cataloged under National Stock Number 4820-01-574-7658, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-574-7658 |
| Item Name | Cap,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Valve Model Number for Which Designed | 803-2177525-M8 |
| Material Document and Classification | QQ-N-281 CL A, HF. ANNEALED FED SPEC SINGLE MATERIAL RESPONSE OR ASTM B164 UNS N04400 ANL ASSN STD SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 2.000 INCHES IN |
| Material | NICKEL ALLOY |
| Attachment Method | BOLTS |
| 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-M8XX-87 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-574-7658 is a Cap,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-577-8723, 4820-01-689-8156. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-574-7658: Valve Model Number for Which Designed: 803-2177525-M8; Material Document and Classification: QQ-N-281 CL A, HF. ANNEALED FED SPEC SINGLE MATERIAL RESPONSE OR ASTM B164 UNS N04400 ANL ASSN STD SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 2.000 INCHES IN; Special Features: THIS IS A BONNET ASSEMBLY COMPRISED OF BONNET, YOKE BUSHING, GLAND EYEBOLTS AND NUTS, WITH ID PLATE; SUPPLIED COMPLETELY ASSEMBLED INCLUDING LOCKTITE APPLICATION; USED ON VARIOUS 2 INCH VALVES: IN-LINE AND ANGLE, LIFT CHECK, STOP, STOP CHECK, THROTTLE 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.