The Cross,flange, cataloged under National Stock Number 4730-01-257-3702, 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 Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 30 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-257-3702 |
| Primary Part Number | 70307-63206-041 |
| Item Name | Cross,flange |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Flange Shape | RECTANGULAR WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Flange Face Design | UNABLE TO DECODE |
| Surface Treatment Document and Classification | UNABLE TO DECODE |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Nominal Length | 3.000 INCHES SECOND END IN |
| Nominal Length | 3.000 INCHES FIRST END IN |
| Nominal Length | 3.000 INCHES THIRD END IN |
| Nominal Length | 2.375 INCHES FOURTH END IN |
| Connection Type | FLANGE ALL ENDS |
| Material Document and Classification | UNABLE TO DECODE |
| Material Document and Classification | QQ-A-250/11 FED SPEC SINGLE MATERIAL RESPONSE FLANGE |
| Material Document and Classification | WW-T-700/6 FED SPEC SINGLE MATERIAL RESPONSE TUBE |
| Bolt Hole Nominal Diameter | 0.312 INCHES FIRST END IN |
| Bolt Hole Nominal Diameter | 0.312 INCHES THIRD END IN |
| Bolt Hole Nominal Diameter | 0.312 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.281 INCHES FOURTH END IN |
| Operating Pressure | 120.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 2.250 INCHES NOMINAL ALL ENDS IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 2.375 INCHES FIRST END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 2.375 INCHES SECOND END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 2.375 INCHES THIRD END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 1.812 INCHES FOURTH END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | UNABLE TO DECODE |
| Bolt Hole Quantity | 4 ALL ENDS |
| Surface Treatment | ANODIZE OVERALL |
| Surface Treatment | UNABLE TO DECODE |
| Nominal Width | 3.000 INCHES SECOND END IN |
| Nominal Width | 3.000 INCHES FIRST END IN |
| Nominal Width | 3.000 INCHES THIRD 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 |
|---|---|
| 70307-63206-041 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| 70307-63206 | D/9 Drawing number reference only Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
NSN 4730-01-257-3702 is a Cross,flange, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-257-3702 has 1 manufacturer part number on file: 70307-63206-041 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for 70307-63206-041: Flange Shape: RECTANGULAR WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Flange Face Design: UNABLE TO DECODE; Surface Treatment Document and Classification: UNABLE TO DECODE. 30 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.