The Disk,rupturable, cataloged under National Stock Number 4820-01-506-4135, 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 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-506-4135 |
| Primary Part Number | A2004391-1 |
| Item Name | Disk,rupturable |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bs&b Safety Systems Llc |
| Status | ACTIVE |
| Disk Material | NICKEL AND PLASTIC |
| Burst Temperature | 72.0 FAHRENHEIT DEGF |
| Disk Type | COMPOSITE |
| Disk Size | 3.000 INCHES IN |
| 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 |
|---|---|
| A2004391-1 PRIMARY | Bs&b Safety Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| A2004391 | 5/9 Secondary reference Bs&b Safety Systems Llc |
NSN 4820-01-506-4135 is a Disk,rupturable, manufactured by Bs&b Safety Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-506-4135 has 1 manufacturer part number on file: A2004391-1 (Bs&b Safety Systems Llc).
Key specifications for A2004391-1: Disk Material: NICKEL AND PLASTIC; Burst Temperature: 72.0 FAHRENHEIT DEGF; Disk Type: COMPOSITE; Special Features: 3" ATOMOSPHERIC VESSEL (AV) RUPTURABLE DISK COMPOSITE OF NICKEL DISK, KLINGERSIL GASKET, POLYTETRAFLUOROETHYLENE CUSHION AND SEAL. BURST RATING @ 9:11.5 PSID @ 72DEG F. DEGF. 4 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.