The Reducer,pipe, cataloged under National Stock Number 4730-01-138-6703, 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 Scott Fetzer Company, the Dba Meriam Process Technologies Div Meriam Instrument. Government technical data includes 12 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-138-6703 |
| Primary Part Number | B-12-RA-4 |
| Item Name | Reducer,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Scott Fetzer Company, the Dba Meriam Process Technologies Div Meriam Instrument |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Nominal Overall Length | 1.968 INCHES IN |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Operating Pressure | 2200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 0.250 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | NPT SECOND END |
| Thread Series Designator | NPT FIRST 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 |
|---|---|
| B-12-RA-4 PRIMARY | Scott Fetzer Company, the Dba Meriam Process Technologies Div Meriam Instrument (USA) |
| SAE J514-3 12-4 140139B PRIMARY | Sae International Dba Sae International (USA) |
| 3/4X1/4FG-B PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division (USA) |
| B-12-RA-4 | Swagelok Co (USA) |
| Reference | Meaning |
|---|---|
| SAE J514 12-4 140139B | 5/9 Secondary reference Sae International Dba Sae International |
| SAE J514 12-4 140139B | 5/9 Secondary reference U.S. Government activity |
| 3/4X1/4FG-B | 5/9 Secondary reference U.S. Government activity |
| SAE-J514 | 5/9 Secondary reference Sae International Dba Sae International |
| B-12-RA-4 | 5/9 Secondary reference Cajon Co |
| SAE-J514-3 | 3/1 Design control — primary reference Sae International Dba Sae International |
| SAE J514 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-138-6703 is a Reducer,pipe, manufactured by Scott Fetzer Company, the Dba Meriam Process Technologies Div Meriam Instrument, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-138-6703 has 4 manufacturer part numbers on file: B-12-RA-4 (Scott Fetzer Company, the Dba Meriam Process Technologies Div Meriam Instrument), SAE J514-3 12-4 140139B (Sae International Dba Sae International), 3/4X1/4FG-B (Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division), B-12-RA-4 (Swagelok Co).
Key specifications for B-12-RA-4: Connection Style: PLAIN (PIPE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END; Nominal Overall Length: 1.968 INCHES IN; Connection Type: THREADED INTERNAL PIPE FIRST END. 12 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.