The Poppet,relief Valve, cataloged under National Stock Number 4820-01-122-7877, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-122-7877 |
| Primary Part Number | 2493844 |
| Item Name | Poppet,relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| FSC Application Data | POWER UNIT ASSEMBLLY |
| General Characteristics Item Description | STEEL CRES AMS 5621 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2493844 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 10159189 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 2493844 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-122-7877 is a Poppet,relief Valve, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-122-7877 has 1 manufacturer part number on file: 2493844 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 2493844: FSC Application Data: POWER UNIT ASSEMBLLY; General Characteristics Item Description: STEEL CRES AMS 5621; End Item Identification: AIRCRAFT MODEL A-18,F-18. 2 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.