The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-424-0328, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 21 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-424-0328 |
| Primary Part Number | 8B1641 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| First End Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Width Across Flats | 0.753 INCHES NOMINAL IN |
| First End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 0.185 INCHES NOMINAL IN |
| Body Style | RELIEVED |
| First End Thread Class | 2A A |
| First End Style Designator | PLAIN |
| Second Diameter From Wrenching Feature | 0.437 INCHES NOMINAL IN |
| Concentric Hole Depth | 1.105 INCHES NOMINAL IN |
| Wrenching Feature Height | 0.225 INCHES NOMINAL IN |
| First End Thread Length | 0.625 INCHES NOMINAL IN |
| Wrenching Feature Style | HEXAGON |
| Length From Bearing Surface of Wrenching Feature to End of Second Diameter | 0.565 INCHES NOMINAL IN |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 1.185 INCHES NOMINAL IN |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Concentric Hole Diameter | 0.187 INCHES NOMINAL IN |
| First Radial Fluid Hole Diameter | 0.131 INCHES NOMINAL IN |
| Distance From First Radial Hole Center to End of Bolt | 0.810 INCHES NOMINAL IN |
| Material | STEEL |
| First Diameter From Wrenching Feature | 0.497 INCHES NOMINAL 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 |
| Part Number | Manufacturer |
|---|---|
| 8B1641 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 4730-00-424-0328 is a Bolt,fluid Passage, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-424-0328 has 1 manufacturer part number on file: 8B1641 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 8B1641: First End Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Width Across Flats: 0.753 INCHES NOMINAL IN; First End Thread Direction: RIGHT-HAND; Length From Bearing Surface of Wrenching Feature to End of First Diameter: 0.185 INCHES NOMINAL IN. 21 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.