Material Document and Classification: VALVE CASTINGS,MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE BODY
Body Inside Diameter: 3.938 INCHES NOMINAL IN
Material: COPPER ALLOY BODY
Seat Angle in Deg: 5.000 NOMINAL
Seating Surface Shape: ANGULAR
Identification
NSN: 4820-00-389-8366
NIIN: 003898366
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-389-8366, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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
4820-00-389-8366
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Style Designator
PLAIN THREADED
Material Document and Classification
VALVE CASTINGS,MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE BODY
Body Inside Diameter
3.938 INCHES NOMINAL IN
Material
COPPER ALLOY BODY
Seat Angle in Deg
5.000 NOMINAL
Seating Surface Shape
ANGULAR
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
DSN208NMPC4
3/9Design control — primary reference
Nibco Inc
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 4820-00-389-8366?
NSN 4820-00-389-8366 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What are the specifications of 4820-00-389-8366?
Key specifications for 4820-00-389-8366: Overall Height: 0.688 INCHES NOMINAL IN; Style Designator: PLAIN THREADED; Material Document and Classification: VALVE CASTINGS,MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE BODY; Body Inside Diameter: 3.938 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-389-8366 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.