The Coupling Assembly,self-Sealing, cataloged under National Stock Number 4730-00-588-2591, 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 Danfoss Power Solutions II, Llc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-588-2591 |
| Primary Part Number | 5101-20B |
| Item Name | Coupling Assembly,self-Sealing |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Danfoss Power Solutions II, Llc |
| Status | ACTIVE |
| Connection Style | PLAIN SECOND QUICK DISCONNECT END |
| Connection Style | GASKET SEAL FIRST QUICK DISCONNECT END |
| Connection Type | THREADED INTERNAL PIPE FIRST QUICK DISCONNECT END |
| Connection Type | THREADED EXTERNAL PIPE SECOND QUICK DISCONNECT END |
| Style Designator | COUPLING ASSEMBLY |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Second End Relationship with First End | NOT IDENTICAL |
| Features Provided | SELF-SEALING |
| Nominal Thread Size | 1.250 INCHES FIRST QUICK DISCONNECT END IN |
| Nominal Thread Size | 1.250 INCHES SECOND QUICK DISCONNECT END IN |
| Material | COPPER ALLOY BODY |
| Thread Series Designator | NPT FIRST QUICK DISCONNECT END |
| Thread Series Designator | NPT SECOND QUICK DISCONNECT END |
| 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 |
|---|---|
| 5101-20B PRIMARY | Danfoss Power Solutions II, Llc (USA) |
| Reference | Meaning |
|---|---|
| 580-211-1699509REVAPCF45 | 3/2 Design control — primary reference U.S. Government activity |
| 5101-20 | 5/9 Secondary reference Danfoss Power Solutions II, Llc |
NSN 4730-00-588-2591 is a Coupling Assembly,self-Sealing, manufactured by Danfoss Power Solutions II, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-588-2591 has 1 manufacturer part number on file: 5101-20B (Danfoss Power Solutions II, Llc).
2 possible matches (shared part number, not a government interchangeability claim): 5905-00-988-3019, 6515-01-198-6559. Verify interchangeability with system specifications before substitution.
Key specifications for 5101-20B: Connection Style: PLAIN SECOND QUICK DISCONNECT END; Connection Style: GASKET SEAL FIRST QUICK DISCONNECT END; Connection Type: THREADED INTERNAL PIPE FIRST QUICK DISCONNECT END; Connection Type: THREADED EXTERNAL PIPE SECOND QUICK DISCONNECT END. 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.