The Flange,pipe, cataloged under National Stock Number 4730-01-153-1521, 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 Oil States Industries, Inc. Div Special Products Div. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-153-1521 |
| Primary Part Number | 299997-101 |
| Item Name | Flange,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Oil States Industries, Inc. Div Special Products Div |
| Status | ACTIVE |
| Flange Diameter | 8.625 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 4.000 INCHES IN |
| Flange Section Style | PLAIN FACE, RAISED NECK |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.685 INCHES NOMINAL IN |
| Neck Height | 0.758 INCHES NOMINAL IN |
| Groove Depth | 0.108 INCHES NOMINAL IN |
| Nominal Thread Size | 4.000 INCHES IN |
| Groove Pitch Diameter | 4.685 INCHES NOMINAL IN |
| Bolt Hole Quantity | 10 |
| Bolt Circle Diameter | 7.125 INCHES NOMINAL IN |
| Screw Thread Series Designator | UN |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL ALLOY |
| Groove Width | 0.190 INCHES NOMINAL IN |
| Thickness | 1.415 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 |
|---|---|
| 299997-101 PRIMARY | Oil States Industries, Inc. Div Special Products Div (USA) |
| Reference | Meaning |
|---|---|
| 299997-101 | 5/9 Secondary reference Edwards Aerospace Inc |
NSN 4730-01-153-1521 is a Flange,pipe, manufactured by Oil States Industries, Inc. Div Special Products Div, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-153-1521 has 1 manufacturer part number on file: 299997-101 (Oil States Industries, Inc. Div Special Products Div).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-320-2905. Verify interchangeability with system specifications before substitution.
Key specifications for 299997-101: Flange Diameter: 8.625 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 4.000 INCHES IN; Flange Section Style: PLAIN FACE, RAISED NECK. 18 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.