The Timer,interval, cataloged under National Stock Number 6645-00-902-3461, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is B.c. Systems Inc. Dba Bc Systems Inc. Government technical data includes 9 specifications, 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6645-00-902-3461 |
| Primary Part Number | 91771 |
| Item Name | Timer,interval |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Manufacturer | B.c. Systems Inc. Dba Bc Systems Inc |
| Status | ACTIVE |
| FSC Application Data | FOR GENERAL PURPOSE USE |
| Current Type | DC |
| Case Surface Treatment | ENAMEL |
| Mounting Method | PLUG-IN |
| Voltage in Volts | 25.0 OR 33.0 |
| Reset Type | ELECTRIC |
| Timer Type | ELECTRICAL |
| Color | BLACK |
| Operation Method | ELECTRONIC OPERATED |
| 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 |
|---|---|
| 91771 PRIMARY | B.c. Systems Inc. Dba Bc Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 1843983-1 | 5/9 Secondary reference Honeywell Intl Inc Defense Avionics Systems Former Bendix Navigation and Control Systems |
| 351665 | 5/9 Secondary reference B.c. Systems Inc. Dba Bc Systems Inc |
| 91771 | 5/9 Secondary reference Tempo Instrument Inc Defense Electronics Div |
| 1843983-1 | 7/2 Vendor item drawing reference Honeywell Intl Inc Defense Avionics Systems |
| 351665 | 5/9 Secondary reference Tempo Instrument Inc Defense Electronics Div |
NSN 6645-00-902-3461 is a Timer,interval, manufactured by B.c. Systems Inc. Dba Bc Systems Inc, classified under FSC 6645, Time Measuring Instruments. Status: active.
NSN 6645-00-902-3461 has 1 manufacturer part number on file: 91771 (B.c. Systems Inc. Dba Bc Systems Inc).
3 possible matches (shared part number, not a government interchangeability claim): 6240-01-314-0468, 4920-01-628-4120, 5985-01-654-5904. Verify interchangeability with system specifications before substitution.
Key specifications for 91771: Overall Height: 2.000 INCHES NOMINAL IN; FSC Application Data: FOR GENERAL PURPOSE USE; Current Type: DC; Case Surface Treatment: ENAMEL. 9 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.
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.