The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-028-8088, 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 De Havilland Aircraft of Canada Limited. Government technical data includes 28 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-028-8088 |
| Primary Part Number | C2U189 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | De Havilland Aircraft of Canada Limited |
| Status | ACTIVE |
| First End Thread Series Designator | UNF |
| First End Thread Direction | RIGHT-HAND |
| Second End Nominal Thread Size | 0.250 INCHES IN |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 1.400 INCHES NOMINAL IN |
| Second End Thread Class | 3B |
| Body Style | PLAIN |
| Distance From Centerline to Flat | 0.437 INCHES NOMINAL IN |
| First End Thread Class | 3A A |
| Cotter Pin Hole Diameter | 0.016 INCHES NOMINAL IN |
| First End Style Designator | PLAIN |
| Concentric Hole Depth | 1.031 INCHES NOMINAL IN |
| Wrenching Feature Height | 0.156 INCHES NOMINAL IN |
| Second End Thread Series Designator | UNF |
| First End Thread Length | 0.500 INCHES NOMINAL IN |
| Wrenching Feature Style | ROUND WITH WRENCH FLATS |
| Material Document and Classification | QQ-S-689,COND F FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of Second Diameter | 1.450 INCHES NOMINAL IN |
| Second End Style Designator | DOUBLE COMPRESSION |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 1.900 INCHES NOMINAL IN |
| Second End Seat Radius | 0.062 INCHES NOMINAL IN |
| Distance From Bolt End to Hole Center | 0.188 INCHES NOMINAL IN |
| Surface Treatment | DICHROMATE AND ZINC |
| First Radial Fluid Hole Diameter | 0.156 INCHES NOMINAL IN |
| Distance From First Radial Hole Center to End of Bolt | 1.270 INCHES NOMINAL IN |
| Material | STEEL |
| Second End Thread Length | 0.375 INCHES NOMINAL IN |
| First Diameter From Wrenching Feature | 0.625 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 |
|---|---|
| C2U189 PRIMARY | De Havilland Aircraft of Canada Limited (CAN) |
| Reference | Meaning |
|---|---|
| 5306L20-013 | 5/2 Secondary reference U.S. Government activity |
| C4875 | 5/9 Secondary reference Cox Machine Inc |
NSN 4730-00-028-8088 is a Bolt,fluid Passage, manufactured by De Havilland Aircraft of Canada Limited, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-028-8088 has 1 manufacturer part number on file: C2U189 (De Havilland Aircraft of Canada Limited).
2 possible matches (shared part number, not a government interchangeability claim): 5945-00-250-2556, 5945-00-801-6400. Verify interchangeability with system specifications before substitution.
Key specifications for C2U189: First End Thread Series Designator: UNF; First End Thread Direction: RIGHT-HAND; Second End Nominal Thread Size: 0.250 INCHES IN; Length From Bearing Surface of Wrenching Feature to End of First Diameter: 1.400 INCHES NOMINAL IN. 28 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.