The Meter,time Totalizing, cataloged under National Stock Number 6645-01-210-2222, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6645-01-210-2222 |
| Item Name | Meter,time Totalizing |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Status | ACTIVE |
| Electrical Movement Type | SYNCHRONOUS MOTOR |
| Indicator Type | DRUM REGISTER |
| Terminal Quantity | 2 |
| Background Color | DULL BLACK |
| Movement Type | ELECTRICAL |
| Current Type | DC |
| Terminal Type | WIRE HOOK |
| Mounting Method | SEMIFLUSH |
| Body Width | 0.500 INCHES NOMINAL IN |
| Smallest Increment Indicated | 1.00 |
| Marking Color | WHITE |
| Maximum Measurement | 9999.00 |
| Hermetic Protection | PROVIDED |
| Body Length | 0.500 INCHES NOMINAL IN |
| Mounting Flange Width | 1.310 INCHES NOMINAL IN |
| Unit Type | MOUNTED |
| Reset Feature | NOT PROVIDED |
| Mounting Configuration | TWO 0.125 IN. MTG HOLES SPACED 1.000 IN APART C TO C; 0.250 IN. MOUNT SET BACK IN |
| Flange Height | 0.870 INCHES NOMINAL IN |
| Body Depth | 2.000 INCHES MINIMUM AND 2.062 INCHES MAXIMUM IN |
| Mounting Type | FLANGE |
| Voltage Rating | 28.0 VOLTS NOMINAL |
| Measurement Unit | HOURS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MIL-M-7793 | 5/9 Secondary reference U.S. Government activity |
| M7793/1-037 | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-7793/1B | 4/1 Identification reference U.S. Government activity |
| MS21341B-09 | 2/2 Government specification standardization U.S. Government activity |
NSN 6645-01-210-2222 is a Meter,time Totalizing, classified under FSC 6645, Time Measuring Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6645-01-290-0393. Verify interchangeability with system specifications before substitution.
Key specifications for 6645-01-210-2222: Electrical Movement Type: SYNCHRONOUS MOTOR; Indicator Type: DRUM REGISTER; Terminal Quantity: 2; Background Color: DULL BLACK. 23 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.