The Tee,tube, cataloged under National Stock Number 4730-01-355-7633, 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 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-355-7633 |
| Primary Part Number | 123ECM51018-1 |
| Item Name | Tee,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416 CL2 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES FIRST END IN |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES THIRD END IN |
| Leg Length | 1.048 INCHES NOMINAL SECOND END IN |
| Leg Length | 1.820 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.048 INCHES NOMINAL THIRD END IN |
| Reduced Passage Nominal Inside Diameter | 0.187 INCHES SECOND END IN |
| Nominal Thread Size | 0.438 INCHES THIRD END IN |
| Nominal Thread Size | 0.563 INCHES SECOND END IN |
| Nominal Thread Size | 0.563 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A ALL ENDS A |
| Material | STEEL COMP 304L OVERALL |
| 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 |
|---|---|
| 123ECM51018-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 123ECM51018-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| 123ECM51018 | D/9 Drawing number reference only Northrop Grumman Systems Corporation |
NSN 4730-01-355-7633 is a Tee,tube, manufactured by Northrop Grumman Systems Corporation, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-355-7633 has 1 manufacturer part number on file: 123ECM51018-1 (Northrop Grumman Systems Corporation).
Key specifications for 123ECM51018-1: Surface Treatment Document and Classification: QQ-P-416 CL2 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: FLARED (TUBE) ALL ENDS; Connection Type: THREADED EXTERNAL TUBE ALL ENDS; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 19 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.