The Valve,ball, cataloged under National Stock Number 4820-01-377-3315, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-01-377-3315 |
| Primary Part Number | 801-6404951-AY99 |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 HANDWHEEL |
| Nominal Pipe Size Accommodated | 5.000 INCHES ALL ENDS IN |
| Connection Style | BEVELED (PIPE) ALL ENDS |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | MIL-T-9047 MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | MIL-C-20159, ALY C96400 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material | NICKEL ALLOY STEM |
| Material | COPPER ALLOY 964 BODY |
| Material | PLASTIC ACETAL SEAT |
| Material | TITANIUM ALLOY FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6404951 AY 99 | Naval Sea Systems Command (USA) |
| 801-6404951-AY99 PRIMARY | Naval Sea Systems Command (USA) |
| 801-6404951-AY99 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| 211073440 | Naval Sea Systems Command (USA) |
| DF330631 ASSY 99 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
NSN 4820-01-377-3315 is a Valve,ball, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-377-3315 has 5 manufacturer part numbers on file: 6404951 AY 99 (Naval Sea Systems Command), 801-6404951-AY99 (Naval Sea Systems Command), 801-6404951-AY99 (Derbyshire Machine & Tool Co), 211073440 (Naval Sea Systems Command), DF330631 ASSY 99 (Huntington Ingalls Inc Div Newport News Shipbuilding).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-642-2353. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6404951-AY99: Furnished Items and Quantity: 1 HANDWHEEL; Nominal Pipe Size Accommodated: 5.000 INCHES ALL ENDS IN; Connection Style: BEVELED (PIPE) ALL ENDS; Connection Type: BUTT WELD PIPE ALL ENDS. 13 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.