The Adapter,straight,pipe to Boss, cataloged under National Stock Number 4730-01-690-3390, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-690-3390 |
| Item Name | Adapter,straight,pipe to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 O-RING |
| Nominal Pipe Size Accommodated | 1.25 INCHES FIRST END IN |
| Connection Style | FLARED (TUBE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY |
| Nominal Outside Diameter Tube Accommodated | 1.25 INCHES SECOND END IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 1.250 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES SECOND END |
| Media for Which Designed | GAS FIRST RESPONSE |
| Media for Which Designed | OIL SECOND RESPONSE |
| Thread Quantity Per Inch | 11.5 FIRST END |
| Material | STEEL STAINLESS - USE STB000 BODY |
| Thread Series Designator | NPT FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 20-FTXO-SS | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-690-3390 is a Adapter,straight,pipe to Boss, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4320-01-690-8200. Verify interchangeability with system specifications before substitution.
Key specifications for 4730-01-690-3390: Furnished Items and Quantity: 1 O-RING; Nominal Pipe Size Accommodated: 1.25 INCHES FIRST END IN; Connection Style: FLARED (TUBE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END. 16 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.