The Ball and Seat Unit, cataloged under National Stock Number 4820-01-689-1202, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-689-1202 |
| Primary Part Number | 845-8616958-ITEM NO-9, 10Q3 |
| Item Name | Ball and Seat Unit |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | ITEM THAT SUPPORTS A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS. |
| 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 |
|---|---|
| 845-8616958-ITEM NO-9, 10Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-800X1PC60, 2640-801X1PC20 | Naval Sea Systems Command (USA) |
| 2644-820-07-ITEM NO-9, 10Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2640-800X1PC60, 2640-801X1PC20Q3 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2644-820-07-ITEM NO-9, 10 | 5/2 Secondary reference U.S. Government activity |
| 845-8616958-ITEM NO-9, 10 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-689-1202 is a Ball and Seat Unit, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-689-1202 has 4 manufacturer part numbers on file: 845-8616958-ITEM NO-9, 10Q3 (Naval Inventory Control Point Mechanicsburg), 2640-800X1PC60, 2640-801X1PC20 (Naval Sea Systems Command), 2644-820-07-ITEM NO-9, 10Q3 (Naval Inventory Control Point Mechanicsburg), 2640-800X1PC60, 2640-801X1PC20Q3 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 845-8616958-ITEM NO-9, 10Q3: Criticality Code Justification: ZZZY; Special Features: ITEM SUPPORTS A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM.; Reference Number Differentiating Characteristics: ITEM THAT SUPPORTS A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS.. 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.