NSN 4820-00-604-4705 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-604-4705. Manufacturer of record part number: 90049-1.
Manufacturer of record: Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
Identification
NSN: 4820-00-604-4705
NIIN: 006044705
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 90049-1
Manufacturer: Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-604-4705, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok. Government technical data includes 5 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. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-604-4705
Primary Part Number
90049-1
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
Status
ACTIVE
Body Outside Diameter
0.590 INCHES NOMINAL IN
Style Designator
PLAIN
Body Inside Diameter
0.440 INCHES NOMINAL IN
Material
PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
Seating Surface Shape
FLAT
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
⇄Related Items3
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4710-01-209-0784POSSIBLE MATCH
TUBE,BENT,METALLIC
Possible match (shared part number)
2540-01-330-00339004-91POSSIBLE MATCH
PAD,PEDAL
Possible match (shared part number)Columbus Jack Corporation Div Columbus Jack
5998-01-473-114790049-1POSSIBLE MATCH
BACKPLANE ASSEMBLY
Possible match (shared part number)Raytheon Company Div Rmd Strategic
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA)
Related Parts
4710-01-209-0784POSSIBLE MATCH
TUBE,BENT,METALLIC
2540-01-330-0033POSSIBLE MATCH
PAD,PEDAL
9004-91
5998-01-473-1147POSSIBLE MATCH
BACKPLANE ASSEMBLY
90049-1
Frequently Asked Questions
What is NSN 4820-00-604-4705?
NSN 4820-00-604-4705 is a Seat,valve, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-604-4705?
NSN 4820-00-604-4705 has 2 manufacturer part numbers on file: 90049-1 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok), 7223X1PC9 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
What NSN replaces 4820-00-604-4705?
3 possible matches (shared part number, not a government interchangeability claim): 4710-01-209-0784, 2540-01-330-0033, 5998-01-473-1147. Verify interchangeability with system specifications before substitution.
What are the specifications of 90049-1?
Key specifications for 90049-1: Overall Height: 0.220 INCHES NOMINAL IN; Body Outside Diameter: 0.590 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.440 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-604-4705 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.