The Tailpiece,union, cataloged under National Stock Number 4730-01-312-2631, 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 Hydrasearch Company, Llc. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-312-2631 |
| Primary Part Number | 6R641-4SS |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Union Outside Diameter | 1.062 INCHES NOMINAL IN |
| End Connection Type | THREADED |
| Seat Type | GASKET |
| Thread Direction | RIGHT-HAND |
| Thread Size | 7/16-20 |
| Screw Thread Series Designator | UNF |
| Screw Thread Location | INTERNAL |
| Material | STEEL |
| 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 |
|---|---|
| 6R641-4SS PRIMARY | Hydrasearch Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 6243060 | D/9 Drawing number reference only Naval Sea Systems Command |
| 64R-1-0-SS | 3/2 Design control — primary reference U.S. Government activity |
| 64R-1 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-312-2631 is a Tailpiece,union, manufactured by Hydrasearch Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-312-2631 has 1 manufacturer part number on file: 6R641-4SS (Hydrasearch Company, Llc).
Key specifications for 6R641-4SS: Union Outside Diameter: 1.062 INCHES NOMINAL IN; End Connection Type: THREADED; Overall Length: 1.062 INCHES NOMINAL IN; Seat Type: GASKET. 8 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.