The Nut,tube Coupling, cataloged under National Stock Number 4730-01-731-2170, 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 Sae International Dba Sae International. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-731-2170 |
| Primary Part Number | AS5175W20L |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Length to Shoulder | 0.813 INCHES MAXIMUM IN |
| Width Across Flats | 1.982 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT (UNJ) |
| Seat Angle | 85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.6250 INCHES IN |
| Nut Height | 1.214 INCHES MINIMUM AND 1.234 INCHES MAXIMUM IN |
| Surface Treatment | UNABLE TO DECODE |
| Nut Style | TUBE COUPLING |
| Thread Quantity Per Inch | 12 |
| Material | UNABLE TO DECODE |
| Smallest Inside Diameter | 1.347 INCHES MINIMUM AND 1.350 INCHES MAXIMUM IN |
| Nominal Tube Outside Diameter | 1.250 INCHES IN |
| 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 |
|---|---|
| AS5175W20L PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| AS5175 | D/9 Drawing number reference only Sae International Dba Sae International |
NSN 4730-01-731-2170 is a Nut,tube Coupling, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-731-2170 has 1 manufacturer part number on file: AS5175W20L (Sae International Dba Sae International).
Key specifications for AS5175W20L: Length to Shoulder: 0.813 INCHES MAXIMUM IN; Width Across Flats: 1.982 INCHES MINIMUM AND 2.005 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT (UNJ); Seat Angle: 85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM. 13 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.