The Nut,union, cataloged under National Stock Number 4730-01-331-3550, 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 Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-331-3550 |
| Primary Part Number | 3225-H-160 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| Status | ACTIVE |
| Material Document and Classification | ASTM-B61 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.500 INCHES IN |
| Nut Style | HEXAGON |
| Material | COPPER ALLOY OVERALL |
| 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 |
|---|---|
| 3225-H-160 | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| 803-4384536-7XXX-21 | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 803-4384536-7XXX-21 | 5/2 Secondary reference U.S. Government activity |
| 803-4384536-7XX | C/1 Advisory reference — outside the item-of-supply concept Naval Inventory Control Point Mechanicsburg |
| 803-7063850-B7X | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 5310PL1289972 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 4384536 | D/9 Drawing number reference only Naval Sea Systems Command |
| 803-4384536-7XXX-21 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-331-3550 is a Nut,union, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-331-3550 has 2 manufacturer part numbers on file: 3225-H-160 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 803-4384536-7XXX-21 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).
Key specifications for 3225-H-160: Material Document and Classification: ASTM-B61 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND; Nominal Thread Size: 1.500 INCHES IN; Nut Style: HEXAGON. 5 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.