NSN 4820-00-221-8685 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-221-8685. Manufacturer of record part number: 316SWSTXVL1 1-2IN.
Manufacturer of record: Armstrong International Inc Dba Armstrong Machine Works
Identification
NSN: 4820-00-221-8685
NIIN: 002218685
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 316SWSTXVL1 1-2IN
Manufacturer: Armstrong International Inc Dba Armstrong Machine Works
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-221-8685, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Armstrong International Inc Dba Armstrong Machine Works. Government technical data includes 1 specification, 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.
Technical Specifications
Parameter
Value
NSN
4820-00-221-8685
Primary Part Number
316SWSTXVL1 1-2IN
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Armstrong International Inc Dba Armstrong Machine Works
Armstrong International Inc Dba Armstrong Machine Works (USA)
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 4820-00-221-8685?
NSN 4820-00-221-8685 is a Seat,valve, manufactured by Armstrong International Inc Dba Armstrong Machine Works, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-221-8685?
NSN 4820-00-221-8685 has 1 manufacturer part number on file: 316SWSTXVL1 1-2IN (Armstrong International Inc Dba Armstrong Machine Works).
What are the specifications of 316SWSTXVL1 1-2IN?
Key specifications for 316SWSTXVL1 1-2IN: End Item Identification: STEAM TRAP MODEL 316,SIZE 1.500 IN IN; Material: STEEL OVERALL. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-00-221-8685 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.