NSN 4820-00-085-3977 · NIIN 000853977 · Part number 21643A1
Schneider Electric Systems Usa Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 73475
Government record, cited
NSN 4820-00-085-3977 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-085-3977. Manufacturer of record part number: 21643A1.
Also searched as4820-00-085-3977 ·
4820000853977 ·
NIIN 000853977 ·
00-085-3977 ·
FSC 4820 Valves, Nonpowered · CAGE 73475 · 21643A1
Nearby stock numbers← 4820-00-085-3976 Thermostat, Valve Co
·
4820-00-085-4266 →
4820-00-085-3977 — Valves, Nonpowered
Features
Seat,valve — FSC 4820
Body Outside Diameter: 0.543 INCHES NOMINAL IN
Style Designator: PLAIN
Body Inside Diameter: 0.325 INCHES NOMINAL IN
Material: STEEL CORROSION RESISTING OVERALL
Seat Angle in Deg: 45.000 NOMINAL
Seating Surface Shape: ANGULAR
1 manufacturer part number on file
Identification
NSN: 4820-00-085-3977
NIIN: 000853977
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 21643A1
Manufacturer: Schneider Electric Systems Usa Inc
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-085-3977, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Schneider Electric Systems Usa Inc. Government technical data includes 6 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. Current acquisition status: Active.
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
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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 4820-00-085-3977?
NSN 4820-00-085-3977 is a Seat,valve, manufactured by Schneider Electric Systems Usa Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-085-3977?
NSN 4820-00-085-3977 has 1 manufacturer part number on file: 21643A1 (Schneider Electric Systems Usa Inc).
What are the specifications of 21643A1?
Key specifications for 21643A1: Overall Height: 0.084 INCHES NOMINAL IN; Body Outside Diameter: 0.543 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.325 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-085-3977 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.