The Clock,master Regulating, cataloged under National Stock Number 6645-01-347-6783, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Frequency Electronics Inc. Government technical data includes 13 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6645-01-347-6783 |
| Primary Part Number | D21700-6200-4 |
| Item Name | Clock,master Regulating |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Manufacturer | Frequency Electronics Inc |
| Status | ACTIVE |
| Frequency in Hertz | 400.0 |
| Current Type | AC AND DC |
| Interval Expiration Signalling Device | NOT INCLUDED |
| Mounting Method | RACK |
| DC Operated Clutch | NOT INCLUDED |
| Independently Operated Clock | INCLUDED |
| Voltage in Volts | 115.0 OR 230.0 |
| Reset Type | ELECTRIC |
| Timer Type | ELECTRICAL |
| Automatic Electric Circuit Control Switch | NOT INCLUDED |
| Color | GRAY/GREY |
| Surface Treatment | PAINT CASE |
| Operating DC Voltage in Volts | 18.0 |
| 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 |
|---|---|
| D21700-6200-4 PRIMARY | Frequency Electronics Inc (USA) |
NSN 6645-01-347-6783 is a Clock,master Regulating, manufactured by Frequency Electronics Inc, classified under FSC 6645, Time Measuring Instruments. Status: active.
NSN 6645-01-347-6783 has 1 manufacturer part number on file: D21700-6200-4 (Frequency Electronics Inc).
Key specifications for D21700-6200-4: Overall Height: 5.218 INCHES NOMINAL IN; Frequency in Hertz: 400.0; Current Type: AC AND DC; Interval Expiration Signalling Device: NOT INCLUDED. 13 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.
NSN 6645-01-347-6783 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.