The Transmitter,pressure, cataloged under National Stock Number 6685-01-490-3291, 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 Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-490-3291 |
| Primary Part Number | AP121BL |
| Item Name | Transmitter,pressure |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement |
| Status | ACTIVE |
| Actuation Method | PRESSURE BELLOWS |
| Current Type | DC |
| Mounting Device Quantity | 1 |
| Voltage Rating | 24.0 VOLTS NOMINAL INPUT |
| Measurement Range | +0.0 TO 25.0 POUNDS PRESSURE PER SQUARE INCH LBS |
| 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 |
|---|---|
| AP121BL PRIMARY | Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement (USA) |
| Reference | Meaning |
|---|---|
| 000-0640-00 | D/9 Drawing number reference only Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement |
NSN 6685-01-490-3291 is a Transmitter,pressure, manufactured by Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-490-3291 has 1 manufacturer part number on file: AP121BL (Honeywell International Inc. Dba Honeywell International Div Honeywell Test and Measurement).
2 possible matches (shared part number, not a government interchangeability claim): 6685-01-494-8441, 6685-01-526-6556. Verify interchangeability with system specifications before substitution.
Key specifications for AP121BL: Actuation Method: PRESSURE BELLOWS; Current Type: DC; Overall Length: 3.310 INCHES NOMINAL IN; Overall Width: 1.500 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.
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.