The Tailpiece,union, cataloged under National Stock Number 4730-01-516-8313, 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 Ssp Fittings Corp. Government technical data includes 10 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through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-516-8313 |
| Primary Part Number | Q504R-4 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Ssp Fittings Corp |
| Status | ACTIVE |
| Nominal Pipe Size Designation | 0.750 INCHES IN |
| Flange Thickness | 0.100 INCHES NOMINAL IN |
| End Connection Type | THREADED |
| Seat Type | STRAIGHT FACE |
| Thread Direction | RIGHT-HAND |
| Thread Size | 3/4-14 |
| Screw Thread Series Designator | NPT |
| Screw Thread Location | EXTERNAL |
| Material | STEEL CORROSION RESISTING |
| Flange Outside Diameter | 1.880 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 |
|---|---|
| Q504R-4 | Ssp Fittings Corp (USA) |
| Reference | Meaning |
|---|---|
| 161K0000 ITEM 20 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 161K0000 ITEM 20 | 3/9 Design control — primary reference U.S. Government activity |
| 161K0233 PN Q504R-4 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 161K0233-4 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 161K0233-4 | 5/9 Secondary reference U.S. Government activity |
| 161K0233 PN Q504R-4 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 161K0233-4 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 161K0000 ITEM 20 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 161K0233 PN Q504R-4 | 5/9 Secondary reference U.S. Government activity |
| 161K0000 | D/9 Drawing number reference only U.S. Government activity |
NSN 4730-01-516-8313 is a Tailpiece,union, manufactured by Ssp Fittings Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-516-8313 has 1 manufacturer part number on file: Q504R-4 (Ssp Fittings Corp).
6 possible matches (shared part number, not a government interchangeability claim): 5306-01-517-4820, 4820-01-517-5457, 4820-01-517-5830. Verify interchangeability with system specifications before substitution.
Key specifications for Q504R-4: Nominal Pipe Size Designation: 0.750 INCHES IN; Flange Thickness: 0.100 INCHES NOMINAL IN; End Connection Type: THREADED; Overall Length: 2.060 INCHES NOMINAL IN. 10 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.