The Flange,pipe, cataloged under National Stock Number 4730-01-023-7772, 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 Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy. Government technical data includes 21 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-023-7772 |
| Primary Part Number | 20-1-1/2 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy |
| Status | ACTIVE |
| Socket Diameter | 1.950 INCHES NOMINAL IN |
| Flange Diameter | 5.000 INCHES NOMINAL IN |
| Face Seating Surface Condition | SERRATED |
| Nominal Pipe Size for Which Designed | 1.500 INCHES IN |
| Socket Depth | 0.620 INCHES NOMINAL IN |
| Maximum Operating Temp and Media for Which Designed | 400.0 FAHRENHEIT GAS AND 400.0 FAHRENHEIT OIL AND 400.0 FAHRENHEIT WATER DEGF |
| Operating Pressure and Type | 150.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 150.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 150.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS |
| Flange Section Style | RAISED FACE, SOCKET NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.620 INCHES NOMINAL IN |
| Neck Height | 0.188 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE |
| Specification/standard Data | 80204-B16.5 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nondefinitive Spec/std Data | 8 TABLE |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 3.880 INCHES NOMINAL IN |
| Raised Face Diameter | 2.875 INCHES NOMINAL IN |
| Raised Face Height | 0.062 INCHES NOMINAL IN |
| Surface Treatment | PAINT |
| Material | STEEL |
| Thickness | 0.690 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 |
|---|---|
| 20-1-1/2 PRIMARY | Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy (USA) |
| Reference | Meaning |
|---|---|
| B16.5 | 5/9 Secondary reference U.S. Government activity |
| ASME B16.5 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
| MIL-F-18180 | 5/9 Secondary reference U.S. Government activity |
| B16-5-1-1-2IN-IPS150PSI-PP-FLGE | 5/9 Secondary reference U.S. Government activity |
| M181801205A01A | 5/9 Secondary reference U.S. Government activity |
| 20-1 1/2 ASTMA- | C/1 Advisory reference — outside the item-of-supply concept Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy |
| 29514 | 5/9 Secondary reference Crane Co Midwest Fittings Div |
NSN 4730-01-023-7772 is a Flange,pipe, manufactured by Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-023-7772 has 1 manufacturer part number on file: 20-1-1/2 (Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy).
4 possible matches (shared part number, not a government interchangeability claim): 4130-01-198-3567, 6130-01-307-8272, 6520-01-480-7994. Verify interchangeability with system specifications before substitution.
Key specifications for 20-1-1/2: Socket Diameter: 1.950 INCHES NOMINAL IN; Flange Diameter: 5.000 INCHES NOMINAL IN; Face Seating Surface Condition: SERRATED; Nominal Pipe Size for Which Designed: 1.500 INCHES IN. 21 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.