The Modification Kit,heat Exchangers, cataloged under National Stock Number 4420-01-640-6834, 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 Boyd Corporation (woburn) Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-640-6834 |
| Primary Part Number | 5636G1 |
| Item Name | Modification Kit,heat Exchangers |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Boyd Corporation (woburn) Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 5636G1 PRIMARY | Boyd Corporation (woburn) Inc (USA) |
| Reference | Meaning |
|---|---|
| 11253447 | 5/9 Secondary reference Ballistic Missile Defense Systems Command |
| 11253447-02 | 7/9 Vendor item drawing reference Ballistic Missile Defense Systems Command |
NSN 4420-01-640-6834 is a Modification Kit,heat Exchangers, manufactured by Boyd Corporation (woburn) Inc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-640-6834 has 1 manufacturer part number on file: 5636G1 (Boyd Corporation (woburn) Inc).
Key specifications for 5636G1: Part Name Assigned by Controlling Agency: HEAT EXCHANGER; End Item Identification: PERIMETER ACQUISITION RADAR ATTACK CHARACTERIZATION SYSTEM. 0 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.
NSN 4420-01-640-6834 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.