The Dampener,fluid Pressure, cataloged under National Stock Number 6685-01-340-4890, 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 Naval Inventory Control Point Mechanicsburg. Government technical data includes 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-340-4890 |
| Primary Part Number | 2621-561-03 ASSY 57AL1 |
| Item Name | Dampener,fluid Pressure |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Operating Pressure Range | +0.0 TO 700.0 POUNDS PER SQUARE INCH LBS |
| Nominal Pipe Size Designation | 2.500 INCHES IN |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2621-561-03 ASSY 57AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-4864184 ASSY 57AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 845-4864184 ASSY 57A | 3/1 Design control — primary reference U.S. Government activity |
| 2621-561-03 ASSY 57A | 5/1 Secondary reference U.S. Government activity |
NSN 6685-01-340-4890 is a Dampener,fluid Pressure, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-340-4890 has 2 manufacturer part numbers on file: 2621-561-03 ASSY 57AL1 (Naval Inventory Control Point Mechanicsburg), 845-4864184 ASSY 57AL1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 2621-561-03 ASSY 57AL1: Operating Pressure Range: +0.0 TO 700.0 POUNDS PER SQUARE INCH LBS; Nominal Pipe Size Designation: 2.500 INCHES IN; Criticality Code Justification: ZZZY; End Item Identification: CASCADE ORIFICAL RESISTIVE DEV. 4 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.