The Bonnet,fluid Cooler,industrial, cataloged under National Stock Number 4420-01-342-3456, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Fluid Handling Llc. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-342-3456 |
| Primary Part Number | 3 124 2 12 215 02 |
| Item Name | Bonnet,fluid Cooler,industrial |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Fluid Handling Llc |
| Status | ACTIVE |
| Style Designator | STRAIGHT |
| Material Document and Classification | MIL-C-15730K MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Diameter | 16.500 INCHES NOMINAL16.500 INCHES NOMINAL IN |
| Flow Type | SINGLE PASSSINGLE PASS |
| Material | COPPER ALLOY OVERALL |
| 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 |
|---|---|
| 3 124 2 12 215 02 PRIMARY | Fluid Handling Llc (USA) |
| 512612090001 REV C PC 3 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 3 124 2 12 215 02 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 3-124-2-12-215- | C/1 Advisory reference — outside the item-of-supply concept Fluid Handling Llc |
| 512612090001 | D/9 Drawing number reference only Fluid Handling Llc |
| 512612090001 REV C PC 3 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 512612090001 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 3-124-2-12-215- | C/1 Advisory reference — outside the item-of-supply concept Itt Corporation Dba Itt Standard |
NSN 4420-01-342-3456 is a Bonnet,fluid Cooler,industrial, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-342-3456 has 2 manufacturer part numbers on file: 3 124 2 12 215 02 (Fluid Handling Llc), 512612090001 REV C PC 3 (Fluid Handling Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4420-01-342-3457, 4320-01-343-0354. Verify interchangeability with system specifications before substitution.
Key specifications for 3 124 2 12 215 02: Style Designator: STRAIGHT; Material Document and Classification: MIL-C-15730K MIL SPEC ALL MATERIAL RESPONSES OVERALL; Diameter: 16.500 INCHES NOMINAL16.500 INCHES NOMINAL IN; Flow Type: SINGLE PASSSINGLE PASS. 5 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.