The Valve,ball, cataloged under National Stock Number 4820-01-281-5173, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-281-5173 |
| Primary Part Number | 255757 ASSEMBLY ET |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 3.938 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.562 INCHES ALL ENDS IN |
| Valve Size | 1.500 INCHES IN |
| Bonnet Type | INSIDE SCREW |
| Second Connection Face to Centerline Distance | 5.250 INCHES IN |
| Nominal Outside Diameter | 5.062 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 6 ALL ENDS |
| Bonnet Attachment Method | THREADED |
| First Connection Face to Centerline Distance | 8.750 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | TITANIUM FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 0.812 INCHES ALL ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2662564 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 255757 ASSEMBLY ET PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
NSN 4820-01-281-5173 is a Valve,ball, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-281-5173 has 2 manufacturer part numbers on file: 2662564 (Huntington Ingalls Inc Div Newport News Shipbuilding), 255757 ASSEMBLY ET (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 255757 ASSEMBLY ET: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 3.938 INCHES ALL ENDS IN; Connection Type: FLANGE ALL ENDS. 17 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 4820-01-281-5173 has DEMIL Code Q. 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.