The Meter,time Totalizing, cataloged under National Stock Number 6645-00-204-4100, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ai-Tek Instruments Llc Dba Ai-Tek Instruments Llc. Government technical data includes 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6645-00-204-4100 |
| Primary Part Number | B19601 |
| Item Name | Meter,time Totalizing |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Manufacturer | Ai-Tek Instruments Llc Dba Ai-Tek Instruments Llc |
| Status | ACTIVE |
| Electrical Movement Type | SYNCHRONOUS MOTOR |
| Body Diameter | 0.750 INCHES NOMINAL IN |
| Indicator Type | DRUM REGISTER |
| Terminal Quantity | 2 |
| Background Color | BLACK BACKGROUND |
| Movement Type | ELECTRICAL |
| Current Type | AC |
| Terminal Type | WIRE HOOK |
| Mounting Method | SEMIFLUSH |
| Smallest Increment Indicated | 1.00 |
| Operating Frequency | 60.0 HERTZ NOMINAL |
| Marking Color | WHITE NUMERALS |
| Maximum Measurement | 9999.00 |
| Hermetic Protection | PROVIDED |
| Body Length | 1.156 INCHES NOMINAL IN |
| Unit Type | MOUNTED |
| Reset Feature | NOT PROVIDED |
| Mounting Flange Diameter | 1.000 INCHES NOMINAL IN |
| Material | ALUMINUM OR STEEL CASE |
| Mounting Type | PANEL |
| Voltage Rating | 115.0 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 |
| Part Number | Manufacturer |
|---|---|
| B19601 PRIMARY | Ai-Tek Instruments Llc Dba Ai-Tek Instruments Llc (USA) |
| Reference | Meaning |
|---|---|
| B19601 | 5/9 Secondary reference U.S. Government activity |
NSN 6645-00-204-4100 is a Meter,time Totalizing, manufactured by Ai-Tek Instruments Llc Dba Ai-Tek Instruments Llc, classified under FSC 6645, Time Measuring Instruments. Status: active.
NSN 6645-00-204-4100 has 1 manufacturer part number on file: B19601 (Ai-Tek Instruments Llc Dba Ai-Tek Instruments Llc).
1 possible match (shared part number, not a government interchangeability claim): 6645-01-244-0232. Verify interchangeability with system specifications before substitution.
Key specifications for B19601: Electrical Movement Type: SYNCHRONOUS MOTOR; Body Diameter: 0.750 INCHES NOMINAL IN; Indicator Type: DRUM REGISTER; Terminal Quantity: 2. 22 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.