The Restrictor,fluid Flow, cataloged under National Stock Number 4730-01-203-8185, 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 Emerson Electric Co Alco Controls Div. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-203-8185 |
| Primary Part Number | 4-2-5-6 |
| Item Name | Restrictor,fluid Flow |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Length | 1.022 INCHES NOMINAL IN |
| Thread Provision | UNTHREADED LOCATION NOT OTHERWISE SPECIFIED |
| Design Type | TUBULAR |
| Material Document and Classification | MIL-C-15726, COMP 70-30, HARD MIL SPEC 2ND MATERIAL RESPONSE |
| Outside Diameter | 0.671 INCHES NOMINAL IN |
| Material | COPPER OR COPPER ALLOY 715 |
| Orifice Diameter | 0.159 INCHES MINIMUM AND 0.162 INCHES MAXIMUM 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 |
|---|---|
| 4-2-5-6 PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| 13216E6345-1 | 5/2 Secondary reference U.S. Government activity |
| 13216E6345-1 | 5/9 Secondary reference Unifab Industries Inc |
NSN 4730-01-203-8185 is a Restrictor,fluid Flow, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-203-8185 has 1 manufacturer part number on file: 4-2-5-6 (Emerson Electric Co Alco Controls Div).
4 possible matches (shared part number, not a government interchangeability claim): 3040-01-247-5673, 5985-01-384-1840, 5120-01-429-6357. Verify interchangeability with system specifications before substitution.
Key specifications for 4-2-5-6: Length: 1.022 INCHES NOMINAL IN; Thread Provision: UNTHREADED LOCATION NOT OTHERWISE SPECIFIED; Design Type: TUBULAR; Material Document and Classification: MIL-C-15726, COMP 70-30, HARD MIL SPEC 2ND MATERIAL RESPONSE. 7 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.