The Head,safety,pressure Relief, cataloged under National Stock Number 4820-01-035-6618, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Johnson Controls Navy Systems, Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-035-6618 |
| Primary Part Number | 022-03871 |
| Item Name | Head,safety,pressure Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Johnson Controls Navy Systems, Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| 022-03871 PRIMARY | Johnson Controls Navy Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 022-02097A | C/1 Advisory reference — outside the item-of-supply concept Johnson Controls Navy Systems, Llc |
| B566S375 | 5/9 Secondary reference Henry Technologies, Inc. |
| B566S-3.75PSI | C/1 Advisory reference — outside the item-of-supply concept Henry Technologies, Inc. |
NSN 4820-01-035-6618 is a Head,safety,pressure Relief, manufactured by Johnson Controls Navy Systems, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-035-6618 has 1 manufacturer part number on file: 022-03871 (Johnson Controls Navy Systems, Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-201-8104. Verify interchangeability with system specifications before substitution.
Key specifications for 022-03871: Special Features: STEEL;HEX HEAD 1.375 IN. W ACROSS FLATS; PLASTIC DISK INSERT; EXTERNA; THREAD 1.000-11-1/2 NPT; 350 PSI; 1.492 IN. O/A LG IN. 0 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.