The Retainer,disk,valve, cataloged under National Stock Number 4820-01-220-2144, 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 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-220-2144 |
| Primary Part Number | 2642-807-02 ITEM 21AL1 |
| Item Name | Retainer,disk,valve |
| 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 |
|---|---|
| 2642-807-02 ITEM 21AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2642-807-02-IT-21AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| H547-001-264285701-86L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7383858-264285701-86L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4558769 ITEM 21ALL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2642-857-01 ITEM 86L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4558795 ITEM 86L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2642-807-02 ITEM 21A | 5/1 Secondary reference U.S. Government activity |
| 2642-807-02-IT-21A | 5/1 Secondary reference U.S. Government activity |
| 845-4558769 ITEM 21AL | 5/1 Secondary reference U.S. Government activity |
| 4558769-021A | 3/1 Design control — primary reference U.S. Government activity |
| 2642-857-01 ITEM 86 | 5/1 Secondary reference U.S. Government activity |
| 7383858-264285701-86 | 5/1 Secondary reference Naval Sea Systems Command |
| 4558769-021AL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| H547-001-264285701-86 | 5/1 Secondary reference U.S. Government activity |
| 845-4558795 ITEM 86 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-220-2144 is a Retainer,disk,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-220-2144 has 7 manufacturer part numbers on file: 2642-807-02 ITEM 21AL1 (Naval Inventory Control Point Mechanicsburg), 2642-807-02-IT-21AL1 (Naval Inventory Control Point Mechanicsburg), H547-001-264285701-86L1 (Naval Inventory Control Point Mechanicsburg), 7383858-264285701-86L1 (Naval Inventory Control Point Mechanicsburg), 845-4558769 ITEM 21ALL1 (Naval Inventory Control Point Mechanicsburg) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-352-1738. Verify interchangeability with system specifications before substitution.
Key specifications for 2642-807-02 ITEM 21AL1: Criticality Code Justification: ZZZY; End Item Identification: NUTS-STEM RETAINING FOR DOUBLE NUT ARRANGEMENT; 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.