The Timer,interval, cataloged under National Stock Number 6645-01-431-3602, is classified within Federal Supply Class 6645 (Time Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6645-01-431-3602 |
| Primary Part Number | 6556-02 |
| Item Name | Timer,interval |
| FSC / FSG | 6645 / 66 — Time Measuring Instruments |
| Manufacturer | Howell Laboratories Inc Dba Howell Laboratories Inc |
| Status | ACTIVE |
| Reset Type | MANUAL |
| Timer Type | MECHANICAL |
| Furnished Items | AUTOMATIC ELECTRIC CIRCUIT CONTROL SWITCH |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6556-02 PRIMARY | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| Reference | Meaning |
|---|---|
| 6556B-02 | 5/9 Secondary reference Howell Laboratories Inc Dba Howell Laboratories Inc |
| AB4 6A6 | C/1 Advisory reference — outside the item-of-supply concept Eagle Signal Controls Div of Mark IV Industries Inc |
| 6720ITEM21 | 5/1 Secondary reference Howell Laboratories Inc Dba Howell Laboratories Inc |
NSN 6645-01-431-3602 is a Timer,interval, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 6645, Time Measuring Instruments. Status: active.
NSN 6645-01-431-3602 has 1 manufacturer part number on file: 6556-02 (Howell Laboratories Inc Dba Howell Laboratories Inc).
Key specifications for 6556-02: Reset Type: MANUAL; Timer Type: MECHANICAL; Special Features: COUNTDOWN TIMER;SETABLE.; End Item Identification: STARTEGIC SEALIFT CONVERSION SHIPS CLASS;ELECTRICAL PANEL ASSY.. 3 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.