The Tailpiece,union, cataloged under National Stock Number 4730-01-138-4479, 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 Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc. Government technical data includes 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-138-4479 |
| Primary Part Number | MR51-6-CE |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc |
| Status | ACTIVE |
| Flange Thickness | 0.313 INCHES NOMINAL IN |
| End Connection Type | WELDED |
| Seat Type | STRAIGHT FACE |
| Tubing Outside Diameter | 1.250 INCHES NOMINAL IN |
| Material | STEEL COMP 304 |
| Flange Outside Diameter | 2.625 INCHES NOMINAL IN |
| Working Pressure and Service Type | 6000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL OIL AND 6000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL GAS AND 6000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER AND 6000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL AIR LBS |
| 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 |
|---|---|
| MR51-6-CE | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| Reference | Meaning |
|---|---|
| 51R-6 304SS | 3/2 Design control — primary reference U.S. Government activity |
| 67191-4 | 3/2 Design control — primary reference U.S. Government activity |
| 51R-6-SS | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-138-4479 is a Tailpiece,union, manufactured by Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-138-4479 has 1 manufacturer part number on file: MR51-6-CE (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
1 possible match (shared part number, not a government interchangeability claim): 5315-01-264-6216. Verify interchangeability with system specifications before substitution.
Key specifications for MR51-6-CE: Flange Thickness: 0.313 INCHES NOMINAL IN; End Connection Type: WELDED; Overall Length: 1.375 INCHES NOMINAL IN; Seat Type: STRAIGHT FACE. 7 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.