The Nut,tube Coupling, cataloged under National Stock Number 4730-00-016-5601, 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 Swagelok Co. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-016-5601 |
| Primary Part Number | S402-1 |
| Item Name | Nut,tube Coupling |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Swagelok Co |
| Status | ACTIVE |
| Length to Shoulder | 0.547 INCHES NOMINAL IN |
| Width Across Flats | 0.562 INCHES NOMINAL IN |
| Thread Series | UNF |
| Seat Angle | 45.00 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.437 INCHES IN |
| Nut Height | 0.720 INCHES NOMINAL IN |
| Nut Style | TUBE COUPLING |
| Thread Class | 2B |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Smallest Inside Diameter | 0.300 INCHES NOMINAL IN |
| Nominal Tube Outside Diameter | 0.250 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 |
|---|---|
| S402-1 PRIMARY | Swagelok Co (USA) |
| 4BZ-S | Parker-Hannifin Corporation Div Instrumentation Products Division (USA) |
| 4NS | Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA) |
| Reference | Meaning |
|---|---|
| 4NS | 5/9 Secondary reference J R Douglass Company |
NSN 4730-00-016-5601 is a Nut,tube Coupling, manufactured by Swagelok Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-016-5601 has 3 manufacturer part numbers on file: S402-1 (Swagelok Co), 4BZ-S (Parker-Hannifin Corporation Div Instrumentation Products Division), 4NS (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
1 possible match (shared part number, not a government interchangeability claim): 5995-00-187-2818. Verify interchangeability with system specifications before substitution.
Key specifications for S402-1: Length to Shoulder: 0.547 INCHES NOMINAL IN; Width Across Flats: 0.562 INCHES NOMINAL IN; Thread Series: UNF; Seat Angle: 45.00 DEGREES NOMINAL. 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.