The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-451-3548, 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 26 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4730-00-451-3548 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Status | ACTIVE |
| First End Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Width Across Flats | 0.551 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN |
| First End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 0.125 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-146 FED SPEC SINGLE TREATMENT RESPONSE |
| Body Style | RELIEVED |
| First End Thread Class | 2A A |
| First End Thread Quantity Per Inch | 16 |
| First End Style Designator | PLAIN |
| Second Diameter From Wrenching Feature | 0.310 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN |
| Concentric Hole Depth | 1.125 INCHES NOMINAL IN |
| Wrenching Feature Height | 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN |
| Hardness Rating | 19.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM |
| First End Thread Length | 0.375 INCHES NOMINAL IN |
| Wrenching Feature Style | HEXAGON |
| Material Document and Classification | QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE |
| Length From Bearing Surface of Wrenching Feature to End of Second Diameter | 0.750 INCHES NOMINAL IN |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 1.438 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Concentric Hole Diameter | 0.118 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM |
| First Radial Fluid Hole Diameter | 0.118 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN |
| Distance From First Radial Hole Center to End of Bolt | 1.062 INCHES NOMINAL IN |
| Material | STEEL COMP 1030 AND STEEL COMP 1045 |
| First Diameter From Wrenching Feature | 0.369 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| First End Nominal Thread Size | 0.375 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 |
|---|---|
| 2584700 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-00-451-3548 is a Bolt,fluid Passage, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
Key specifications for 4730-00-451-3548: First End Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Width Across Flats: 0.551 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN; First End Thread Direction: RIGHT-HAND; Length From Bearing Surface of Wrenching Feature to End of First Diameter: 0.125 INCHES NOMINAL IN. 26 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.