The Stem,disc Assembly, cataloged under National Stock Number 4820-01-641-5657, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-641-5657 |
| Primary Part Number | CD-023-20-12/47/17/19/21/35L1 |
| Item Name | Stem,disc Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| CD-023-20-12/47/17/19/21/35L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| CD-023-20-12/47/17/19/21/35 | 5/1 Secondary reference Naval Sea Systems Command |
| 803-6397434-X4XXX1-091 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 803-6397434-X4XXX1-091L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-641-5657 is a Stem,disc Assembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-641-5657 has 1 manufacturer part number on file: CD-023-20-12/47/17/19/21/35L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for CD-023-20-12/47/17/19/21/35L1: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. 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.