The Reducer,tube, cataloged under National Stock Number 4730-01-161-4115, 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 21 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-161-4115 |
| Primary Part Number | 7M637DA-12 |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-83488,CL 3,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | FLARED (TUBE) SECOND END |
| Connection Style | FLARED (TUBE) FIRST END |
| Nominal Overall Length | 1.531 INCHES IN |
| Criticality Code Justification | FEAT |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Nominal Outside Diameter Tube Accommodated | 0.375 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES FIRST END IN |
| Reduced Passage Nominal Inside Diameter | 0.375 INCHES SECOND END IN |
| Nominal Thread Size | 0.562 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Seat Angle | 37.0 DEGREES SECOND END |
| Surface Treatment | ALUMINUM OVERALL |
| Thread Class | 3A FIRST END A |
| Thread Class | 3A SECOND END A |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF FIRST END |
| Thread Series Designator | UNF SECOND END |
| Reducer Type | CONCENTRIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 7M637DA-12 | Sps Technologies, Llc Dba Airdrome Precision Components (USA) |
| 7M637DA-12 PRIMARY | The Boeing Company Div Defense (USA) |
| 7M637DA-12 | Nelson Aero Space, Inc. (USA) |
| 7M637DA-12 | Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply (USA) |
| Reference | Meaning |
|---|---|
| 7M637 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 7M637DA-12 | 5/9 Secondary reference Designed Metal Connections Inc Dba Permaswage Usa Div Permaswage, a Pcc Company |
| 7M637DA-12 | 5/9 Secondary reference Faber Enterprises, Inc. Div Faber Enterprise Inc |
NSN 4730-01-161-4115 is a Reducer,tube, manufactured by The Boeing Company Div Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-161-4115 has 4 manufacturer part numbers on file: 7M637DA-12 (Sps Technologies, Llc Dba Airdrome Precision Components), 7M637DA-12 (The Boeing Company Div Defense), 7M637DA-12 (Nelson Aero Space, Inc.), 7M637DA-12 (Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply).
Key specifications for 7M637DA-12: Surface Treatment Document and Classification: MIL-C-83488,CL 3,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: FLARED (TUBE) SECOND END; Connection Style: FLARED (TUBE) FIRST END; Nominal Overall Length: 1.531 INCHES IN. 21 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.