The Valve,ball, cataloged under National Stock Number 4820-01-377-6258, 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 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-377-6258 |
| Primary Part Number | 556-6408988-AYA W/LK DVC AYAB |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 LEVER AND 1 LOCKING DEVICE |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Connection Style | BEVELED (PIPE) ALL ENDS |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | ASTM A351 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-C-465, ALY C63200 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-S-763, CL 304 FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Material | PLASTIC SEAT |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING BODY |
| Material | COPPER ALLOY 632 STEM |
| 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 |
|---|---|
| 556-6408988-AYA W/LK DVC AYAB PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2643-785-05 ASSY A | 5/1 Secondary reference Naval Sea Systems Command |
| 211063620 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-377-6258 is a Valve,ball, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-377-6258 has 1 manufacturer part number on file: 556-6408988-AYA W/LK DVC AYAB (Naval Sea Systems Command).
Key specifications for 556-6408988-AYA W/LK DVC AYAB: Furnished Items and Quantity: 1 LEVER AND 1 LOCKING DEVICE; Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Connection Style: BEVELED (PIPE) ALL ENDS; Connection Type: BUTT WELD PIPE ALL ENDS. 14 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.