The Nipple,tube, cataloged under National Stock Number 4730-01-085-1801, 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 Parker-Hannifin Corp Div Parflex Division. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-085-1801 |
| Primary Part Number | N4BU4 |
| Item Name | Nipple,tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Parker-Hannifin Corp Div Parflex Division |
| Status | ACTIVE |
| Furnished Items and Quantity | 2 LOCKNUT AND 2 TUBE COUPLING NUT W/SLEEVE |
| Connection Style | PLAIN (TUBE) ALL ENDS |
| Nominal Overall Length | 2.172 INCHES IN |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Style Designator | CLOSE |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES ALL ENDS IN |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | -40.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Thread Class | 2A ALL ENDS A |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Thread Series Designator | UNF ALL ENDS |
| 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 |
|---|---|
| N4BU4 PRIMARY | Parker-Hannifin Corp Div Parflex Division (USA) |
| Reference | Meaning |
|---|---|
| P4BU4 | C/1 Advisory reference — outside the item-of-supply concept Parker-Hannifin Corp Div Parflex Division |
| 351-F3-16 | C/1 Advisory reference — outside the item-of-supply concept Compass Water Solutions, Inc |
| N4BU4 | 5/9 Secondary reference U.S. Government activity |
| 351-F3-16 | 5/9 Secondary reference Separation & Recovery Systems Inc |
NSN 4730-01-085-1801 is a Nipple,tube, manufactured by Parker-Hannifin Corp Div Parflex Division, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-085-1801 has 1 manufacturer part number on file: N4BU4 (Parker-Hannifin Corp Div Parflex Division).
Key specifications for N4BU4: Furnished Items and Quantity: 2 LOCKNUT AND 2 TUBE COUPLING NUT W/SLEEVE; Connection Style: PLAIN (TUBE) ALL ENDS; Nominal Overall Length: 2.172 INCHES IN; Connection Type: THREADED EXTERNAL TUBE ALL ENDS. 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.