The Filter Set,infrared Light, cataloged under National Stock Number 6650-01-344-6402, is classified within Federal Supply Class 6650 (Optical Instruments, Test Equipment, Components and Accessories) of the Instruments and Laboratory Equipment group. The manufacturer of record is The Farfield Company. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6650-01-344-6402 |
| Primary Part Number | BEF-1 |
| Item Name | Filter Set,infrared Light |
| FSC / FSG | 6650 / 66 — Optical Instruments, Test Equipment, Components and Accessories |
| Manufacturer | The Farfield Company |
| Status | ACTIVE |
| General Characteristics Item Description | MEASURES AND ADJUSTS THE ATTENUATION OF EACH RECEIVER MODULE AT A DISTANCE OF 150 FEET; MEASURES THE AMOUNT OF SIGNAL MARGIN AFTER COMPLETING ALIGNMENT OF THE INFRARED PERIMETER SECURITY SYSTEM; INCLUDES CALIBRATED NEUTRAL DENSITY FILTERS OF 1DB,2DB,4DB,8DB,15DB AND 30DB; INCLUDES FILTER HOLDER AND CARRYING CASE FT |
| 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 |
|---|---|
| BEF-1 PRIMARY | The Farfield Company (USA) |
| Reference | Meaning |
|---|---|
| BE-F-1 | 5/9 Secondary reference Bird-Eye Security Intl Inc |
NSN 6650-01-344-6402 is a Filter Set,infrared Light, manufactured by The Farfield Company, classified under FSC 6650, Optical Instruments, Test Equipment, Components and Accessories. Status: active.
NSN 6650-01-344-6402 has 1 manufacturer part number on file: BEF-1 (The Farfield Company).
Key specifications for BEF-1: General Characteristics Item Description: MEASURES AND ADJUSTS THE ATTENUATION OF EACH RECEIVER MODULE AT A DISTANCE OF 150 FEET; MEASURES THE AMOUNT OF SIGNAL MARGIN AFTER COMPLETING ALIGNMENT OF THE INFRARED PERIMETER SECURITY SYSTEM; INCLUDES CALIBRATED NEUTRAL DENSITY FILTERS OF 1DB,2DB,4DB,8DB,15DB AND 30DB; INCLUDES FILTER HOLDER AND CARRYING CASE FT. 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.
NSN 6650-01-344-6402 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.