NSN 4820-00-067-8539 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-067-8539. Manufacturer of record part number: 20526.
The Disk,valve, cataloged under National Stock Number 4820-00-067-8539, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Grove Valve Operations. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 12 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-067-8539
Primary Part Number
20526
Item Name
Disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Grove Valve Operations
Status
ACTIVE
Shoulder Width
0.070 INCHES NOMINAL IN
Shoulder Height
0.350 INCHES NOMINAL IN
Style Designator
PLUG
Seat Angle
45.0 DEGREES NOMINAL
Nominal Thread Size
0.313 INCHES IN
Thread Class
2A A
Material
STEEL
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 Items12
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3810-00-462-228920526POSSIBLE MATCH
INDICATOR ASSEMBLY,BOOM ANGLE
Possible match (shared part number)Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.
5845-00-886-6304POSSIBLE MATCH
MOUNTING SECTOR
Possible match (shared part number)
5330-01-202-263920526POSSIBLE MATCH
SEAL RING,METAL
Possible match (shared part number)Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
6520-01-290-826520526POSSIBLE MATCH
IMPRESSION MATERIAL MIXING TIP,G
Possible match (shared part number)Kerr Corporation
5310-01-306-464120526POSSIBLE MATCH
WASHER,LOCK
Possible match (shared part number)Funk Mfg Co Sub of Deere and Co
4820-01-393-0473POSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)
5330-01-647-831220526POSSIBLE MATCH
GASKET
Possible match (shared part number)Berg Manufacturing, Inc.
NSN 4820-00-067-8539 is a Disk,valve, manufactured by Grove Valve Operations, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-067-8539?
NSN 4820-00-067-8539 has 1 manufacturer part number on file: 20526 (Grove Valve Operations).
What NSN replaces 4820-00-067-8539?
12 possible matches (shared part number, not a government interchangeability claim): 3810-00-462-2289, 5845-00-886-6304, 5330-01-202-2639. Verify interchangeability with system specifications before substitution.
What are the specifications of 20526?
Key specifications for 20526: Overall Height: 0.650 INCHES NOMINAL IN; Shoulder Width: 0.070 INCHES NOMINAL IN; Shoulder Height: 0.350 INCHES NOMINAL IN; Style Designator: PLUG. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-067-8539 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.