NSN 4820-01-373-0445 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-373-0445. Manufacturer of record part number: 1A21-R3-15S.
Operating Pressure: 1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Material: ALUMINUM ALLOY BODY
2 manufacturer part numbers on file
Manufacturer of record: Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division
Identification
NSN: 4820-01-373-0445
NIIN: 013730445
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 1A21-R3-15S
Manufacturer: Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-01-373-0445, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-373-0445
Primary Part Number
1A21-R3-15S
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division
Status
ACTIVE
Operating Pressure
1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division (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 4820-01-373-0445?
NSN 4820-01-373-0445 is a Valve,safety Relief, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-373-0445?
NSN 4820-01-373-0445 has 2 manufacturer part numbers on file: 6558502 (Naval Sea Systems Command), 1A21-R3-15S (Parker-Hannifin Corporation Dba Pneutronics Div Gear Pump Division).
What are the specifications of 1A21-R3-15S?
Key specifications for 1A21-R3-15S: Operating Pressure: 1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Material: ALUMINUM ALLOY BODY. 2 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-373-0445 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.