The Valve,ball, cataloged under National Stock Number 4820-01-256-8531, 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 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-256-8531 |
| Primary Part Number | 255719 ASSY RHL1 |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 HANDLE |
| Connection Style | SOCKET ALL ENDS |
| Criticality Code Justification | ZZZY |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | MI1-S-867,CL III MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-C-465,COMP 630 FED SPEC SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | QQ-S-763,CL 304,COND A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Operating Pressure | 4500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Material | COPPER ALLOY 630 STEM |
| Material | PLASTIC SEAT |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING BODY |
| Valve Operation Method | MANUAL |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 255719 ASSY RHL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 255719 ASSY RH | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-256-8531 is a Valve,ball, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-256-8531 has 1 manufacturer part number on file: 255719 ASSY RHL1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 255719 ASSY RHL1: Furnished Items and Quantity: 1 HANDLE; Connection Style: SOCKET ALL ENDS; Criticality Code Justification: ZZZY; Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS. 15 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.
NSN 4820-01-256-8531 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.