Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN
Flange Diameter: 2.359 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN
Body Outside Diameter: 1.243 INCHES MINIMUM AND 1.247 INCHES MAXIMUM IN
Style Designator: PLAIN FLANGED
Body Inside Diameter: 0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
Under Flange Height: 1.562 INCHES NOMINAL IN
Material: NICKEL ALLOY OVERALL
Identification
NSN: 4820-00-911-8535
NIIN: 009118535
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-911-8535, 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8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-911-8535
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Flange Seat to Disk End Height
0.188 INCHES NOMINAL IN
Flange Diameter
2.359 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN
Body Outside Diameter
1.243 INCHES MINIMUM AND 1.247 INCHES MAXIMUM IN
Style Designator
PLAIN FLANGED
Body Inside Diameter
0.749 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
Under Flange Height
1.562 INCHES NOMINAL IN
Material
NICKEL ALLOY OVERALL
Seating Surface Shape
FLAT
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
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
P8037A
3/9Design control — primary reference
Atlas Valve Co
No interchangeability data on file.
Other items in FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-00-911-8535?
NSN 4820-00-911-8535 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What are the specifications of 4820-00-911-8535?
Key specifications for 4820-00-911-8535: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 2.359 INCHES MINIMUM AND 2.391 INCHES MAXIMUM IN; Body Outside Diameter: 1.243 INCHES MINIMUM AND 1.247 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-911-8535 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.