The Flange,pipe,swivel Retaining, cataloged under National Stock Number 4730-00-903-8639, 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 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-903-8639 |
| Primary Part Number | 188-74045-3-48 |
| Item Name | Flange,pipe,swivel Retaining |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Flange Diameter | 6.620 INCHES NOMINAL IN |
| Face Seating Surface Condition | MACHINED |
| Nominal Pipe Size for Which Designed | 3.000 INCHES IN |
| Flange Section Style | PLAIN FACE |
| Style Designator | ROUND, ONE BOLT HOLE CIRCLE |
| Bolt Hole Diameter | 0.560 INCHES NOMINAL IN |
| Specification/standard Data | 81349-MIL-F-20042 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | EF TYPE |
| Bolt Hole Quantity | 8 |
| Bolt Circle Diameter | 5.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| Thickness | 0.940 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 |
|---|---|
| 188-74045-3-48 PRIMARY | Hydrasearch Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 188-74045-3-48 | 3/9 Design control — primary reference Danfoss Power Solutions II, Llc |
| MIL-F-20042 | 4/1 Identification reference U.S. Government activity |
| 3-74045 | D/9 Drawing number reference only Danfoss Power Solutions II, Llc |
| 3-74045-3-48 | 5/9 Secondary reference Danfoss Power Solutions II, Llc |
NSN 4730-00-903-8639 is a Flange,pipe,swivel Retaining, manufactured by Hydrasearch Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-903-8639 has 1 manufacturer part number on file: 188-74045-3-48 (Hydrasearch Company, Llc).
3 possible matches (shared part number, not a government interchangeability claim): 4730-00-903-8641, 4730-01-303-9255, 4730-01-304-6166. Verify interchangeability with system specifications before substitution.
Key specifications for 188-74045-3-48: Flange Diameter: 6.620 INCHES NOMINAL IN; Face Seating Surface Condition: MACHINED; Nominal Pipe Size for Which Designed: 3.000 INCHES IN; Flange Section Style: PLAIN FACE. 12 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.