The Retainer,disk,valve, cataloged under National Stock Number 4820-01-633-6690, 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2 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-633-6690 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | QQ-N-281 CL B/ASTM D2000 68G907 FED SPEC SINGLE MATERIAL RESPONSE |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| C916-02B | 5/9 Secondary reference U.S. Government activity |
| 206715ITEM21 | 5/2 Secondary reference U.S. Government activity |
| C916102B | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-633-6690 is a Retainer,disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-633-6690: Material Document and Classification: QQ-N-281 CL B/ASTM D2000 68G907 FED SPEC SINGLE MATERIAL RESPONSE; Part Name Assigned by Controlling Agency: DISC RETAINER ASSEMBLY; End Item Identification: 3/4" 55MM BACK PRESSURE CONTROL UNION ENDS MM; Material: NICKEL ALLOY. 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.