The Flange,pipe, cataloged under National Stock Number 4730-01-518-4569, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-518-4569 |
| Primary Part Number | 256186 ITEM 31 PLAIN |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Flange Diameter | 3.170 INCHES NOMINAL IN |
| Nominal Pipe Size for Which Designed | 2.500 INCHES IN |
| Operating Pressure and Type | 700.0 POUNDS PER SQUARE INCH (PSI) SALT WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS |
| Flange Section Style | PLAIN FACE, WELDING NECK |
| Style Designator | ROUND, TWO BOLT HOLE CIRCLES |
| Neck Height | 0.750 INCHES NOMINAL IN |
| Thickness | 1.125 INCHES NOMINAL IN |
| 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 |
|---|---|
| 256186 ITEM 31 PLAIN PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 508-4553919 ITEM 31 PLAIN | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 256186 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 508-4553919 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4730-01-518-4569 is a Flange,pipe, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-518-4569 has 2 manufacturer part numbers on file: 256186 ITEM 31 PLAIN (Huntington Ingalls Inc Div Newport News Shipbuilding), 508-4553919 ITEM 31 PLAIN (Naval Sea Systems Command).
Key specifications for 256186 ITEM 31 PLAIN: Flange Diameter: 3.170 INCHES NOMINAL IN; Nominal Pipe Size for Which Designed: 2.500 INCHES IN; Operating Pressure and Type: 700.0 POUNDS PER SQUARE INCH (PSI) SALT WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS; Flange Section Style: PLAIN FACE, WELDING NECK. 7 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.