The Disk,rupturable, cataloged under National Stock Number 4820-01-571-8555, 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 3 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-571-8555 |
| Primary Part Number | 77-4003-01 |
| Item Name | Disk,rupturable |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bs&b Safety Systems Llc |
| Status | ACTIVE |
| Disk Material | NICKEL ALLOY |
| Burst Pressure | 190.0 PRESSURE POUNDS PER SQUARE INCH GAGE AND 200.0 PRESSURE POUNDS PER SQUARE INCH GAGE |
| Disk Size | 2.000 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 |
|---|---|
| 377-18329-000 ITEM 30 | Johnson Controls Navy Systems, Llc (USA) |
| 77-4003-01 PRIMARY | Bs&b Safety Systems Llc (USA) |
| 026-41992-000 | Johnson Controls Navy Systems, Llc (USA) |
NSN 4820-01-571-8555 is a Disk,rupturable, manufactured by Bs&b Safety Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-571-8555 has 3 manufacturer part numbers on file: 377-18329-000 ITEM 30 (Johnson Controls Navy Systems, Llc), 77-4003-01 (Bs&b Safety Systems Llc), 026-41992-000 (Johnson Controls Navy Systems, Llc).
Key specifications for 77-4003-01: Disk Material: NICKEL ALLOY; Burst Pressure: 190.0 PRESSURE POUNDS PER SQUARE INCH GAGE AND 200.0 PRESSURE POUNDS PER SQUARE INCH GAGE; Part Name Assigned by Controlling Agency: DISK, RUPTURE; End Item Identification: RECEIVER, VERTICAL 30 O.D. X 66 HIGH NAVY TYPE, 265 DWP 23.5 CU. FT. TOTAL VOLUME. 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.