The Head,safety,pressure Relief, cataloged under National Stock Number 4820-01-106-4128, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Bs&b Safety Systems Llc. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-106-4128 |
| Primary Part Number | SA-11 |
| Item Name | Head,safety,pressure Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bs&b Safety Systems Llc |
| Status | ACTIVE |
| Burst Pressure | 8400.0 PRESSURE POUNDS PER SQUARE INCH GAGE |
| Head Type | SCREW |
| End Connection Type | THREADED |
| Burst Temperature | 900.0 FAHRENHEIT DEGF |
| Head Size | 0.500 INCHES IN |
| Head Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| SA-11 PRIMARY | Bs&b Safety Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| 77-24-1005-23 | 5/9 Secondary reference Bs&b Safety Systems Llc |
NSN 4820-01-106-4128 is a Head,safety,pressure Relief, manufactured by Bs&b Safety Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-106-4128 has 1 manufacturer part number on file: SA-11 (Bs&b Safety Systems Llc).
1 possible match (shared part number, not a government interchangeability claim): 7690-01-458-3206. Verify interchangeability with system specifications before substitution.
Key specifications for SA-11: Burst Pressure: 8400.0 PRESSURE POUNDS PER SQUARE INCH GAGE; Head Type: SCREW; End Connection Type: THREADED; Burst Temperature: 900.0 FAHRENHEIT DEGF. 6 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.