The Flange,pipe, cataloged under National Stock Number 4730-01-290-4971, 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 The American Society of Mechanical Engineers. Government technical data includes 16 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-290-4971 |
| Primary Part Number | B16.5 4IN.IPS |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Flange Diameter | 10.750 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 4.000 INCHES IN |
| Flange Section Style | RAISED FACE, WELDING NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.875 INCHES NOMINAL IN |
| Neck Height | 2.500 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE |
| Specification/standard Data | 80204-ANSI B16.5 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Nondefinitive Spec/std Data | 18 TABLE |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 8.500 INCHES NOMINAL IN |
| Raised Face Diameter | 6.188 INCHES NOMINAL IN |
| Raised Face Height | 0.250 INCHES NOMINAL IN |
| Material | STEEL |
| Thickness | 1.500 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 |
|---|---|
| B16.5 4IN.IPS | The American Society of Mechanical Engineers (USA) |
| Reference | Meaning |
|---|---|
| 21539 | 5/9 Secondary reference Crane Co Midwest Fittings Div |
| MIL-F-18180 | 5/9 Secondary reference U.S. Government activity |
| 60 4 IN.IPS | 5/1 Secondary reference Ati Ladish Llc Dba Ati Wah Chang Div Ati Forged Products - Cudahy |
| ANSI B16.5 4IN.IPS. | 5/9 Secondary reference U.S. Government activity |
| M18180/1061A01 | 5/9 Secondary reference U.S. Government activity |
| AMSE B16.5 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
NSN 4730-01-290-4971 is a Flange,pipe, manufactured by The American Society of Mechanical Engineers, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-290-4971 has 1 manufacturer part number on file: B16.5 4IN.IPS (The American Society of Mechanical Engineers).
3 possible matches (shared part number, not a government interchangeability claim): 6105-01-407-1189, 2640-01-416-7156, 5935-01-671-5693. Verify interchangeability with system specifications before substitution.
Key specifications for B16.5 4IN.IPS: Flange Diameter: 10.750 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 4.000 INCHES IN; Flange Section Style: RAISED FACE, WELDING NECK. 16 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.