The Pyrometer,indicating, cataloged under National Stock Number 6685-01-426-8919, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Pyrometer,indicating |
| FSC / FSG | 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments (FSG 66) |
| Manufacturers | Caterpillar Inc Div Caterpillar Defense (CAGE 11083); Altronic Inc (CAGE 0W3Y7) |
| Parameter | Value |
|---|---|
| NSN | 6685-01-426-8919 |
| Primary Part Number | 133-6333 |
| Item Name | Pyrometer,indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 133-6333 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 691 067 PRIMARY | Altronic Inc (USA) |
| Reference | Meaning |
|---|---|
| 9Y1784 | 5/9 Secondary reference Caterpillar Inc Div Caterpillar Defense |
| 7C-9064 IT3 | C/1 Advisory reference — outside the item-of-supply concept Caterpillar Inc Div Caterpillar Defense |
NSN 6685-01-426-8919 is a Pyrometer,indicating, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-426-8919 has 2 manufacturer part numbers on file: 133-6333 (Caterpillar Inc Div Caterpillar Defense), 691 067 (Altronic Inc).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-448-0815. Verify interchangeability with system specifications before substitution.
Possible hazard — SDS may be required (DLA HMIC P). 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.