The Disk,valve, cataloged under National Stock Number 4820-01-512-9850, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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.
Technical Specifications
Parameter
Value
NSN
4820-01-512-9850
Item Name
Disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Supplementary Features
NYLON DISC
Style Designator
PLUG
Nominal Thread Size
1.125 INCHES IN
Media for Which Designed
LIQUID OR GAS
Thread Class
3B
Thread Quantity Per Inch
12
Material
COPPER ALLOY AND PLASTIC
Thread Series Designator
UNF
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.
4820-01-534-8156PLC-12829 TYPE 1POSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-534-8160041415DEPOSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-552-6371POSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)
4820-01-644-8416POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)
5310-01-711-2021134580XXPOSSIBLE MATCH
NUT,SELF-LOCKING,HEXAGON
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
PLC-12829
D/9Drawing number reference only
U.S. Government activity
004805AO
3/2Design control — primary reference
U.S. Government activity
PLC-12829 ITEM 5
5/2Secondary reference
U.S. Government activity
Related Parts
4820-01-534-8156POSSIBLE MATCH
VALVE,GLOBE
PLC-12829 TYPE 1
4820-01-534-8160POSSIBLE MATCH
STEM,FLUID VALVE
041415DE
4820-01-552-6371POSSIBLE MATCH
VALVE,GLOBE
4820-01-644-8416POSSIBLE MATCH
DISK,VALVE
5310-01-711-2021POSSIBLE MATCH
NUT,SELF-LOCKING,HEXAGON
134580XX
Frequently Asked Questions
What is NSN 4820-01-512-9850?
NSN 4820-01-512-9850 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-512-9850?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-534-8156, 4820-01-534-8160, 4820-01-552-6371. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-512-9850?
Key specifications for 4820-01-512-9850: Supplementary Features: NYLON DISC; Style Designator: PLUG; Nominal Thread Size: 1.125 INCHES IN; Special Features: MIL-C-15726, AL. C71500. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-512-9850 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.