The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-627-0540, 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 Sae International Dba Sae International. Government technical data includes 29 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-00-627-0540 |
| Primary Part Number | MS21939-3L4 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| First End Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Width Across Flats | 0.621 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN |
| First End Thread Direction | RIGHT-HAND |
| Second End Thread Quantity Per Inch | 24 |
| Second End Nominal Thread Size | 0.375 INCHES IN |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 0.354 INCHES NOMINAL IN |
| Second End Thread Class | 3A A |
| Third Diameter From Wrenching Feature | 0.499 INCHES NOMINAL IN |
| Body Style | BODY WRENCHING |
| First End Thread Class | 3A A |
| First End Thread Quantity Per Inch | 20 |
| First End Style Designator | FLARELESS |
| Length From Bearing Surface of Wrenching Feature to End of Third Diameter | 1.027 INCHES NOMINAL IN |
| Second Diameter From Wrenching Feature | 0.433 INCHES NOMINAL IN |
| Second End Seat Angle | 12.0 DEGREES NOMINAL |
| Wrenching Feature Height | 0.312 INCHES NOMINAL IN |
| Second End Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| First End Thread Length | 0.850 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN |
| Wrenching Feature Style | HEXAGON |
| Material Document and Classification | QQ-A-268,T4 FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of Second Diameter | 0.666 INCHES NOMINAL IN |
| First End Seat Angle | 12.0 DEGREES NOMINAL |
| Second End Style Designator | FLARELESS |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 2.072 INCHES NOMINAL IN |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Concentric Hole Diameter | 0.187 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE |
| First Radial Fluid Hole Diameter | 0.189 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 |
|---|---|
| MS21939-3L4 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| SAE-AS18280 | 3/1 Design control — primary reference Sae International Dba Sae International |
| MS21939-3L4 | 5/1 Secondary reference Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution |
| MS21939-3L4 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-00-627-0540 is a Bolt,fluid Passage, manufactured by Sae International Dba Sae International, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-627-0540 has 1 manufacturer part number on file: MS21939-3L4 (Sae International Dba Sae International).
Key specifications for MS21939-3L4: First End Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF); Width Across Flats: 0.621 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN; First End Thread Direction: RIGHT-HAND; Second End Thread Quantity Per Inch: 24. 29 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.