The Reducer,tube, cataloged under National Stock Number 4730-01-156-0761, 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 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-01-156-0761 |
| Primary Part Number | 7M637DA-20D |
| Item Name | Reducer,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 TUBE COUPLING NUT |
| Surface Treatment Document and Classification | MIL-C-83488,CL 3,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | FLARED (TUBE) ALL ENDS |
| Nominal Overall Length | 2.000 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Nominal Outside Diameter Tube Accommodated | 0.625 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 0.750 INCHES FIRST END IN |
| Reduced Passage Nominal Inside Diameter | 0.484 INCHES SECOND END IN |
| Nominal Thread Size | 1.062 INCHES FIRST END IN |
| Nominal Thread Size | 0.875 INCHES SECOND END IN |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Specification/standard Data | 76301-7-637 MANUFACTURERS STANDARD |
| Nondefinitive Spec/std Data | AN919 SCHEDULE AND 20 SIZE AND D MATERIAL |
| Surface Treatment | ALUMINUM OVERALL |
| Thread Class | 3A ALL ENDS A |
| Thread Quantity Per Inch | 12 FIRST END |
| Material | ALUMINUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) 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 | X |
| Part Number | Manufacturer |
|---|---|
| 7M637DA-20D PRIMARY | The Boeing Company Div Defense (USA) |
| 7M637DA-20D | Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply (USA) |
| Reference | Meaning |
|---|---|
| 10108810 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 4730-01-156-0761 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 4730-01-156-0761 has 2 manufacturer part numbers on file: 7M637DA-20D (The Boeing Company Div Defense), 7M637DA-20D (Allan Aircraft Supply Co., Llc Dba Allan Aircraft Supply).
Key specifications for 7M637DA-20D: Furnished Items and Quantity: 1 TUBE COUPLING NUT; Surface Treatment Document and Classification: MIL-C-83488,CL 3,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Connection Style: FLARED (TUBE) ALL ENDS; Nominal Overall Length: 2.000 INCHES IN. 20 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.