The Elbow,tube, cataloged under National Stock Number 4730-01-155-5045, 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 Boeing Company Div Defense. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-155-5045 |
| Primary Part Number | 7M637BY-6D |
| Item Name | Elbow,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Flow Angle | 45.0 DEGREES |
| Surface Treatment Document and Classification | MIL-C-83488,TYPE 2,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Connection Type | THREADED EXTERNAL TUBE FIRST END BULKHEAD |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Material Document and Classification | MIL-C-83488 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES ALL ENDS IN |
| Leg Length | 1.672 INCHES NOMINAL FIRST END IN |
| Leg Length | 0.812 INCHES NOMINAL SECOND END IN |
| Nominal Thread Size | 0.562 INCHES FIRST END BULKHEAD IN |
| Nominal Thread Size | 0.562 INCHES ALL ENDS IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Surface Treatment | ALUMINUM OVERALL |
| Thread Class | 3A FIRST END BULKHEAD A |
| Thread Class | 3A ALL ENDS A |
| Material | ALUMINUM OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END BULKHEAD |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS |
| 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 |
|---|---|
| 7M637BY-6D | Nelson Aero Space, Inc. (USA) |
| 7M637BY-6D PRIMARY | The Boeing Company Div Defense (USA) |
| 7M637BY-6D | Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply (USA) |
| 7M637BY-6D | Sps Technologies, Llc Dba Airdrome Precision Components (USA) |
| 7M637BY-6D | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| AS1040D0606V | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| 7M637B4-6D | C/1 Advisory reference — outside the item-of-supply concept The Boeing Company Div Defense |
| 10108802 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 7M637BY-6D | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| 7M637 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 7M637BY-6D | 5/9 Secondary reference Faber Enterprises, Inc. Div Faber Enterprise Inc |
NSN 4730-01-155-5045 is a Elbow,tube, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-155-5045 has 6 manufacturer part numbers on file: 7M637BY-6D (Nelson Aero Space, Inc.), 7M637BY-6D (The Boeing Company Div Defense), 7M637BY-6D (Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply), 7M637BY-6D (Sps Technologies, Llc Dba Airdrome Precision Components), 7M637BY-6D (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems) and 1 more.
Key specifications for 7M637BY-6D: Flow Angle: 45.0 DEGREES; Surface Treatment Document and Classification: MIL-C-83488,TYPE 2,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: FLARED (TUBE) ALL ENDS; Connection Type: THREADED EXTERNAL TUBE FIRST END BULKHEAD. 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.