The Flange,pipe, cataloged under National Stock Number 4730-01-289-3606, 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 15 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-289-3606 |
| Primary Part Number | 17-2SS |
| 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 |
| Flange Diameter | 6.000 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 2.000 INCHES IN |
| Flange Section Style | RAISED FACE, RAISED NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.625 INCHES NOMINAL IN |
| Neck Height | 0.188 INCHES NOMINAL IN |
| Nominal Thread Size | 2.000 INCHES IN |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 4.750 INCHES NOMINAL IN |
| Raised Face Diameter | 3.625 INCHES NOMINAL IN |
| Raised Face Height | 0.062 INCHES NOMINAL IN |
| Screw Thread Series Designator | NPT |
| Material | STEEL CORROSION RESISTING |
| Thickness | 0.688 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 |
|---|---|
| 9498M21P01 | General Electric Company (USA) |
| 17-2SS PRIMARY | Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy (USA) |
| Reference | Meaning |
|---|---|
| AMSE-0B16.5 | 5/1 Secondary reference The American Society of Mechanical Engineers |
| MIL-F-18180 | 5/9 Secondary reference U.S. Government activity |
| B16.5 | 5/2 Secondary reference U.S. Government activity |
| MIL-F-18180/5 | 5/9 Secondary reference U.S. Government activity |
| ASME B16.5 | 4/1 Identification reference U.S. Government activity |
| AMSE-B16.5 | 5/1 Secondary reference The American Society of Mechanical Engineers |
NSN 4730-01-289-3606 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 4730-01-289-3606 has 2 manufacturer part numbers on file: 9498M21P01 (General Electric Company), 17-2SS (Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-290-4971. Verify interchangeability with system specifications before substitution.
Key specifications for 17-2SS: Flange Diameter: 6.000 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 2.000 INCHES IN; Flange Section Style: RAISED FACE, RAISED NECK. 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.
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.