The Header,cooler,lubricating Oil, cataloged under National Stock Number 4320-01-522-3509, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-522-3509 |
| Primary Part Number | 155-7970 |
| Item Name | Header,cooler,lubricating Oil |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| General Characteristics Item Description | END ITEMS USED ON: 2320-01-465-2174 MK23, 2320-01-465-2174 MK25, 2320-01-465-2180 MK27, 2320-01-465-2182 MK28, 2320-01-465-2186 MK29, 2320-01-465-2189 MK30 |
| 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 |
|---|---|
| 155-7970 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 7HB464 | 5/9 Secondary reference Oshkosh Defense Llc |
| 7HB464 | 3/9 Design control — primary reference Oshkosh Corp |
NSN 4320-01-522-3509 is a Header,cooler,lubricating Oil, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-522-3509 has 1 manufacturer part number on file: 155-7970 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 155-7970: General Characteristics Item Description: END ITEMS USED ON: 2320-01-465-2174 MK23, 2320-01-465-2174 MK25, 2320-01-465-2180 MK27, 2320-01-465-2182 MK28, 2320-01-465-2186 MK29, 2320-01-465-2189 MK30; Part Name Assigned by Controlling Agency: BONNET-OIL COOLER. 1 specification is 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.