The Valve,vacuum Regulating, cataloged under National Stock Number 4820-01-445-5555, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Honeywell International, Inc Div Aerospace-Tucson. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-445-5555 |
| Primary Part Number | 131402-2 |
| Item Name | Valve,vacuum Regulating |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Honeywell International, Inc Div Aerospace-Tucson |
| Status | ACTIVE |
| First End Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | -35.0 FAHRENHEIT DEGF |
| Temp Rating | 135.0 FAHRENHEIT DEGF |
| Second End Nominal Thread Size | 0.438 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 3B |
| Body Style | STRAIGHT THRU |
| First End Seat Angle in Deg | 37.0 |
| First End Thread Class | 3A A |
| First End Style Designator | FLARED |
| Second End Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Second End Style Designator | GASKET SEAL |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Temp Adjustability | ADJUSTABLE |
| First End Outside Diameter Tube Accommodated | 0.375 INCHES NOMINAL IN |
| Second End Connection Type | THREADED INTERNAL BOSS |
| First End Nominal Thread Size | 0.563 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 131402-2 PRIMARY | Honeywell International, Inc Div Aerospace-Tucson (USA) |
| 181A353-1 | Lockheed Martin Corporation Div Rotary and Mission Systems (USA) |
| Reference | Meaning |
|---|---|
| 181A353 | 7/2 Vendor item drawing reference Lockheed Martin Corporation Div Rotary and Mission Systems |
NSN 4820-01-445-5555 is a Valve,vacuum Regulating, manufactured by Honeywell International, Inc Div Aerospace-Tucson, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-445-5555 has 2 manufacturer part numbers on file: 131402-2 (Honeywell International, Inc Div Aerospace-Tucson), 181A353-1 (Lockheed Martin Corporation Div Rotary and Mission Systems).
Key specifications for 131402-2: First End Thread Series Designator: UNIFIED NATIONAL JOINT (UNJ); First End Thread Direction: RIGHT-HAND; Temp Rating: -35.0 FAHRENHEIT DEGF; Temp Rating: 135.0 FAHRENHEIT DEGF. 20 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.
NSN 4820-01-445-5555 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.