The Valve,safety Relief, cataloged under National Stock Number 4820-01-321-6399, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Terex Usa, Llc Dba Terex Usa, Llc. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-321-6399 |
| Primary Part Number | 201543 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Terex Usa, Llc Dba Terex Usa, Llc |
| Status | ACTIVE |
| Flow Control Device | O-RING, DILATING |
| Style Designator | STRAIGHT THRU |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 201543 PRIMARY | Terex Usa, Llc Dba Terex Usa, Llc (USA) |
| Reference | Meaning |
|---|---|
| 201543 | 5/9 Secondary reference Koehring Cranes and Excavators Inc Sub of Northwest Engineering Co |
NSN 4820-01-321-6399 is a Valve,safety Relief, manufactured by Terex Usa, Llc Dba Terex Usa, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-321-6399 has 1 manufacturer part number on file: 201543 (Terex Usa, Llc Dba Terex Usa, Llc).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-550-6421. Verify interchangeability with system specifications before substitution.
Key specifications for 201543: Flow Control Device: O-RING, DILATING; Style Designator: STRAIGHT THRU; Special Features: CARTRIDGE TYPE; Valve Operation Method: AUTOMATIC. 3 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.