General Characteristics Item Description: CRES,COMPOSITION 17-4 PH,PASSIVATED FINISH 1.180 IN. RADIUS OF FLAPPER,2 MTG SLOTS IN LINE,0.1285 IN. W,0.148 IN. LG IN
Identification
NSN: 4820-00-165-2109
NIIN: 001652109
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Flapper,valve, cataloged under National Stock Number 4820-00-165-2109, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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
4820-00-165-2109
Item Name
Flapper,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
General Characteristics Item Description
CRES,COMPOSITION 17-4 PH,PASSIVATED FINISH 1.180 IN. RADIUS OF FLAPPER,2 MTG SLOTS IN LINE,0.1285 IN. W,0.148 IN. LG IN
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
328303
3/2Design control — primary reference
U.S. Government activity
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 4820-00-165-2109?
NSN 4820-00-165-2109 is a Flapper,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What are the specifications of 4820-00-165-2109?
Key specifications for 4820-00-165-2109: General Characteristics Item Description: CRES,COMPOSITION 17-4 PH,PASSIVATED FINISH 1.180 IN. RADIUS OF FLAPPER,2 MTG SLOTS IN LINE,0.1285 IN. W,0.148 IN. LG IN. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-00-165-2109 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.