NSN 4820-01-520-4821 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-520-4821. Manufacturer of record part number: 106-8001.
Also searched as4820-01-520-4821 ·
4820015204821 ·
NIIN 015204821 ·
01-520-4821 ·
FSC 4820 Valves, Nonpowered · CAGE 53154 · 106-8001 · 506-0018 · 506-0018 PC NO 5
The Seat,valve, cataloged under National Stock Number 4820-01-520-4821, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Portland Valve Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Seat,valve
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Portland Valve Llc (CAGE 53154)
Technical Specifications
Parameter
Value
NSN
4820-01-520-4821
Primary Part Number
106-8001
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Portland Valve Llc
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-520-4842106-6011POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Portland Valve Llc
4820-01-520-4880106-7001POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Portland Valve Llc
3120-01-520-6784106-0189POSSIBLE MATCH
BEARING,WASHER,THRUST
Possible match (shared part number)Portland Valve Llc
5365-01-520-6798106-0186POSSIBLE MATCH
PLUG,MACHINE THREAD
Possible match (shared part number)Portland Valve Llc
3120-01-520-6811106-0178POSSIBLE MATCH
BEARING,SLEEVE
Possible match (shared part number)Portland Valve Llc
NSN 4820-01-520-4821 is a Seat,valve, manufactured by Portland Valve Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-520-4821?
NSN 4820-01-520-4821 has 2 manufacturer part numbers on file: 106-8001 (Portland Valve Llc), 506-0018 PC NO 5 (Portland Valve Llc).
What NSN replaces 4820-01-520-4821?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-520-4842, 4820-01-520-4880, 3120-01-520-6784. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-520-4821 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.