The Adapter,straight,flange to Tube, cataloged under National Stock Number 4730-01-031-3283, 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 Northrop Grumman Systems Corporation. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-031-3283 |
| Primary Part Number | A51P20504-13 |
| Item Name | Adapter,straight,flange to Tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Flange Face Design | PLAIN SECOND END |
| Connection Style | PLAIN (TUBE) FIRST END |
| Connection Style | BEADED HOSE SECOND END |
| Bolt Circle Nominal Diameter | 2.020 INCHES SECOND END IN |
| Nominal Overall Length | 2.000 INCHES IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | UNTHREADED EXTERNAL TUBE FIRST END |
| Bolt Hole Nominal Diameter | 0.284 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 1.500 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.032 INCHES SECOND END IN |
| Bolt Hole Quantity | 4 SECOND END |
| Nominal Thickness | 0.180 INCHES SECOND END 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 |
|---|---|
| A51P20504-13 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| A51P20504-13 | Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp (USA) |
| A51P20504-13 | Capy Machine Shop Inc. Dba Capy Machine Shop Inc (USA) |
| Reference | Meaning |
|---|---|
| A51P20504-13 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51P20504-13 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
NSN 4730-01-031-3283 is a Adapter,straight,flange to Tube, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-031-3283 has 3 manufacturer part numbers on file: A51P20504-13 (Northrop Grumman Systems Corporation), A51P20504-13 (Howe Machine & Tool Corp. Dba Howe Machine & Tool Corp), A51P20504-13 (Capy Machine Shop Inc. Dba Capy Machine Shop Inc).
Key specifications for A51P20504-13: Flange Shape: ROUND WITH HOLES SECOND END; Flange Face Design: PLAIN SECOND END; Connection Style: PLAIN (TUBE) FIRST END; Connection Style: BEADED HOSE SECOND END. 13 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.