The Adapter,air Filter Holder, cataloged under National Stock Number 6640-01-465-9646, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6640-01-465-9646 |
| Primary Part Number | FHA-4CF |
| Item Name | Adapter,air Filter Holder |
| FSC / FSG | 6640 / 66 — Laboratory Equipment and Supplies |
| Manufacturer | Hi-Q Environmental Products Co Inc |
| Status | ACTIVE |
| General Characteristics Item Description | 4 INCH DIA. FILTER PAPER HOLDER TO 1-1/2 INCH STRAIGHT PIPE "CF" SERIES HOLDER ADAPTER FITTING IN |
| 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 |
|---|---|
| FHA-4CF PRIMARY | Hi-Q Environmental Products Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 98-1260 | 5/1 Secondary reference U.S. Government activity |
NSN 6640-01-465-9646 is a Adapter,air Filter Holder, manufactured by Hi-Q Environmental Products Co Inc, classified under FSC 6640, Laboratory Equipment and Supplies. Status: active.
NSN 6640-01-465-9646 has 1 manufacturer part number on file: FHA-4CF (Hi-Q Environmental Products Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-526-0779. Verify interchangeability with system specifications before substitution.
Key specifications for FHA-4CF: General Characteristics Item Description: 4 INCH DIA. FILTER PAPER HOLDER TO 1-1/2 INCH STRAIGHT PIPE "CF" SERIES HOLDER ADAPTER FITTING IN; Part Name Assigned by Controlling Agency: ADAPTER AIR FILTER 4IN DIA IN. 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.