The Nut,union, cataloged under National Stock Number 4730-01-476-5503, 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 Staples & Pfeiffer, Inc.. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-01-476-5503 |
| Primary Part Number | 1560 2.5IN ITEM 4 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Staples & Pfeiffer, Inc. |
| Status | ACTIVE |
| Temp Rating | 425.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | ASTM B61 ASSN STD ALL MATERIAL RESPONSES NUT |
| Maximum Working Pressure Rating and Service for Which Designed | 250.0 POUNDS PER SQUARE INCH (PSI) STEAM AND 250.0 POUNDS PER SQUARE INCH (PSI) WATER LBS |
| Drilled Hole Diameter | 2.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY AND NICKEL ALLOY NUT |
| 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 |
|---|---|
| 1560 2.5IN ITEM 4 PRIMARY | Staples & Pfeiffer, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 1560 | D/9 Drawing number reference only Staples & Pfeiffer, Inc. |
NSN 4730-01-476-5503 is a Nut,union, manufactured by Staples & Pfeiffer, Inc., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-476-5503 has 1 manufacturer part number on file: 1560 2.5IN ITEM 4 (Staples & Pfeiffer, Inc.).
Key specifications for 1560 2.5IN ITEM 4: Temp Rating: 425.0 FAHRENHEIT NOMINAL DEGF; Material Document and Classification: ASTM B61 ASSN STD ALL MATERIAL RESPONSES NUT; Maximum Working Pressure Rating and Service for Which Designed: 250.0 POUNDS PER SQUARE INCH (PSI) STEAM AND 250.0 POUNDS PER SQUARE INCH (PSI) WATER LBS; Drilled Hole Diameter: 2.500 INCHES NOMINAL IN. 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.