The Dampener,fluid Pressure, cataloged under National Stock Number 6685-01-498-6232, 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 Weiss Instruments, Inc.. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 6685-01-498-6232 |
| Primary Part Number | PSN-B-1/4NPT/4034K54 |
| Item Name | Dampener,fluid Pressure |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Weiss Instruments, Inc. |
| Status | ACTIVE |
| Operating Pressure Range | +0.0 TO 100000.0 POUNDS PER SQUARE INCH LBS |
| Nominal Pipe Size Designation | 0.250 INCHES IN |
| Thread Location | EXTERNAL |
| Threaded Direct Pressure Connection | PROVIDED |
| Gage End Connection Type | FEMALE AND MALE |
| Functional Description | REDUCE PRESSURE FLOWING INTO THE PRESSURE GAUGE |
| Material | COPPER ALLOY |
| Connection Quantity | 1 |
| 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 |
|---|---|
| 4034K54 | Mcmaster-Carr Supply Co (USA) |
| PSN-B-1/4NPT/4034K54 PRIMARY | Weiss Instruments, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 18537-1 | 5/9 Secondary reference Gse Holdings Inc. Dba Itw Military Gse Div Hobart Ground Systems |
| 18537-1 | C/1 Advisory reference — outside the item-of-supply concept Itw Gse Inc. |
NSN 6685-01-498-6232 is a Dampener,fluid Pressure, manufactured by Weiss Instruments, Inc., classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-498-6232 has 2 manufacturer part numbers on file: 4034K54 (Mcmaster-Carr Supply Co), PSN-B-1/4NPT/4034K54 (Weiss Instruments, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 6520-01-594-6887. Verify interchangeability with system specifications before substitution.
Key specifications for PSN-B-1/4NPT/4034K54: Operating Pressure Range: +0.0 TO 100000.0 POUNDS PER SQUARE INCH LBS; Nominal Pipe Size Designation: 0.250 INCHES IN; Overall Length: 1.375 INCHES NOMINAL IN; Thread Location: EXTERNAL. 8 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.