The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-340-4144, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-340-4144 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| First End Thread Series Designator | UNF |
| Width Across Flats | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| First End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 1.131 INCHES MINIMUM AND 1.132 INCHES MAXIMUM IN |
| Body Style | PLAIN |
| First End Thread Class | 3A A |
| First End Thread Quantity Per Inch | 20 |
| Concentric Hole Depth | 1.620 INCHES MINIMUM AND 1.680 INCHES MAXIMUM IN |
| Wrenching Feature Height | 0.080 INCHES NOMINAL IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| First End Thread Length | 0.480 INCHES NOMINAL IN |
| Wrenching Feature Style | HEXAGON |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 1.780 INCHES MINIMUM AND 1.830 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.110 INCHES MINIMUM AND 0.122 INCHES MAXIMUM IN |
| First Radial Fluid Hole Diameter | 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN |
| Distance From First Radial Hole Center to End of Bolt | 1.490 INCHES NOMINAL IN |
| Material | STEEL COMP 4140 OR STEEL COMP 8740 |
| First Diameter From Wrenching Feature | 0.498 INCHES MINIMUM AND 0.499 INCHES MAXIMUM IN |
| First End Nominal Thread Size | 0.500 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 6-66647-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-340-4144 is a Bolt,fluid Passage, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-340-4144: First End Thread Series Designator: UNF; Width Across Flats: 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN; First End Thread Direction: RIGHT-HAND; Length From Bearing Surface of Wrenching Feature to End of First Diameter: 1.131 INCHES MINIMUM AND 1.132 INCHES MAXIMUM IN. 20 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.