The Disk,rupturable, cataloged under National Stock Number 4820-00-016-9704, 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 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-016-9704 |
| Primary Part Number | 77BSB271SIZE1-2IN |
| Item Name | Disk,rupturable |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bs&b Safety Systems Llc |
| Status | ACTIVE |
| Disk Material | STEEL CORROSION RESISTING |
| Burst Pressure | 2800.0 PRESSURE POUNDS PER SQUARE INCH GAGE |
| Criticality Code Justification | FEAT |
| Burst Temperature | 72.0 FAHRENHEIT DEGF |
| Disk Type | SCORED |
| Cross-Sectional Shape | CONCAVE |
| Disk Size | 0.500 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 77BSB271SIZE1-2IN PRIMARY | Bs&b Safety Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| 4820PL1060774 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 77BSB271 | 5/1 Secondary reference Bs&b Safety Systems Llc |
| 4820PL1627052 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C1575-1 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 4820-00-016-9704 is a Disk,rupturable, manufactured by Bs&b Safety Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-016-9704 has 1 manufacturer part number on file: 77BSB271SIZE1-2IN (Bs&b Safety Systems Llc).
Key specifications for 77BSB271SIZE1-2IN: Disk Material: STEEL CORROSION RESISTING; Burst Pressure: 2800.0 PRESSURE POUNDS PER SQUARE INCH GAGE; Criticality Code Justification: FEAT; Burst Temperature: 72.0 FAHRENHEIT DEGF. 7 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.