The Holder,filter, cataloged under National Stock Number 6640-01-596-4742, is classified within Federal Supply Class 6640 (Laboratory Equipment and Supplies) of the Instruments and Laboratory Equipment group. The manufacturer of record is Hi-Q Environmental Products Co Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6640-01-596-4742 |
| Primary Part Number | CFH-25 |
| Item Name | Holder,filter |
| FSC / FSG | 6640 / 66 — Laboratory Equipment and Supplies |
| Manufacturer | Hi-Q Environmental Products Co Inc |
| Status | ACTIVE |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| CFH-25 PRIMARY | Hi-Q Environmental Products Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 6640NCM060286 | 5/1 Secondary reference Defense Medical Standardization Board |
| 1959 | 5/1 Secondary reference U.S. Government activity |
NSN 6640-01-596-4742 is a Holder,filter, manufactured by Hi-Q Environmental Products Co Inc, classified under FSC 6640, Laboratory Equipment and Supplies. Status: active.
NSN 6640-01-596-4742 has 1 manufacturer part number on file: CFH-25 (Hi-Q Environmental Products Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 6105-01-666-3531. Verify interchangeability with system specifications before substitution.
Key specifications for CFH-25: Special Features: OPEN FACED COMBINATION CARTRIDGE AND PAPER HOLDER; USE WITH CF-SERIES SAMPLING SYSTEMS WITH A 1.5 IN DIA FEMALE THREADED 11.5 TPI INTAKE; FOR USE WITH END ITEM NSN 6665-01-584-8599 AIR FILTER USED IN RADIATION LABS IN; Part Name Assigned by Controlling Agency: HOLDER FILTER COMBINATION 47MM MM; End Item Identification: 6665-01-584-8599 SAMPLING PUMP, AIR; Material: ALUMINUM ALLOY. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.