The Bolt,fluid Passage, cataloged under National Stock Number 4730-00-628-7972, 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 Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-628-7972 |
| Primary Part Number | 537034-2 |
| Item Name | Bolt,fluid Passage |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| First End Thread Series Designator | UNF |
| Width Across Flats | 0.934 INCHES NOMINAL IN |
| First End Thread Direction | RIGHT-HAND |
| Length From Bearing Surface of Wrenching Feature to End of First Diameter | 0.180 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE |
| Third Diameter From Wrenching Feature | 0.756 INCHES NOMINAL IN |
| Body Style | RELIEVED |
| First End Thread Class | 3A A |
| First End Thread Quantity Per Inch | 16 |
| Length From Bearing Surface of Wrenching Feature to End of Third Diameter | 2.720 INCHES NOMINAL IN |
| Second Diameter From Wrenching Feature | 0.665 INCHES NOMINAL IN |
| Wrenching Feature Height | 0.720 INCHES NOMINAL IN |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| First End Thread Length | 0.710 INCHES NOMINAL IN |
| Criticality Code Justification | AAQL |
| Wrenching Feature Style | HEXAGON |
| Material Document and Classification | AMS6322 ASSN STD SINGLE MATERIAL RESPONSE |
| Length From Bearing Surface of Wrenching Feature to End of Second Diameter | 1.680 INCHES NOMINAL IN |
| Length From Bearing Surface of Wrenching Feature to Bolt End | 4.840 INCHES NOMINAL IN |
| Concentric Hole Diameter | 0.180 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM |
| First Radial Fluid Hole Diameter | 0.138 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN |
| Length From Bearing Surface of Wrenching Feature to End of Fourth Diameter | 4.310 INCHES NOMINAL IN |
| Distance From First Radial Hole Center to End of Bolt | 0.510 INCHES NOMINAL IN |
| Material | STEEL |
| First Diameter From Wrenching Feature | 1.057 INCHES NOMINAL IN |
| First End Nominal Thread Size | 0.750 INCHES IN |
| Fourth Diameter From Wrenching Feature | 0.665 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 | F |
| Part Number | Manufacturer |
|---|---|
| 537034-2 | Horst Engineering & Manufacturing Co (USA) |
| 537034-2 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 537034-2 PRIMARY | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
| 537034-2 | Derco Aerospace, Inc. Dba Derco Aerospace, Inc. a Lockheed Martin Company (USA) |
| Reference | Meaning |
|---|---|
| 537034-2 | 5/9 Secondary reference Hartford Aircraft Products, Inc |
NSN 4730-00-628-7972 is a Bolt,fluid Passage, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-628-7972 has 4 manufacturer part numbers on file: 537034-2 (Horst Engineering & Manufacturing Co), 537034-2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 537034-2 (Hamilton Sundstrand Corporation Dba Collins Aerospace), 537034-2 (Derco Aerospace, Inc. Dba Derco Aerospace, Inc. a Lockheed Martin Company).
Key specifications for 537034-2: First End Thread Series Designator: UNF; Width Across Flats: 0.934 INCHES NOMINAL IN; First End Thread Direction: RIGHT-HAND; Length From Bearing Surface of Wrenching Feature to End of First Diameter: 0.180 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.