The Nut,union, cataloged under National Stock Number 4730-01-412-6842, 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 Naval Sea Systems Command. Government technical data includes 15 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-412-6842 |
| Primary Part Number | 801-6758238PC6 |
| Item Name | Nut,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 2.188 INCHES NOMINAL IN |
| Shoulder Step Width | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Shoulder Width | 0.230 INCHES NOMINAL IN |
| Thread Series | UN |
| Temp Rating | 160.0 FAHRENHEIT NOMINAL DEGF |
| Material Document and Classification | ASTM-B-446 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.750 INCHES IN |
| Nut Height | 1.060 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 12 |
| Material | NICKEL ALLOY OVERALL |
| Smallest Inside Diameter | 1.755 INCHES MINIMUM AND 1.765 INCHES MAXIMUM IN |
| Shoulder Seat Diameter | 2.000 INCHES NOMINAL 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 |
|---|---|
| 801-6758238PC6 | Naval Sea Systems Command (USA) |
| 801-6640820ASSY18,PC6 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 801-6758238 | D/9 Drawing number reference only Naval Sea Systems Command |
| 801-6640820 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2633-791-04-PC6 | 3/2 Design control — primary reference U.S. Government activity |
| 2633-791-04 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-412-6842 is a Nut,union, manufactured by Naval Sea Systems Command, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-412-6842 has 2 manufacturer part numbers on file: 801-6758238PC6 (Naval Sea Systems Command), 801-6640820ASSY18,PC6 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-434-6672, 4730-01-735-8413. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6758238PC6: Width Across Flats: 2.188 INCHES NOMINAL IN; Shoulder Step Width: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN; Shoulder Width: 0.230 INCHES NOMINAL IN; Thread Series: UN. 15 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.