NSN 4820-01-574-3301 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-574-3301. Manufacturer of record part number: 6610 M4M7 1/2-20 UNF-2A.
Manufacturer of record: Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
Identification
NSN: 4820-01-574-3301
NIIN: 015743301
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 6610 M4M7 1/2-20 UNF-2A
Manufacturer: Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
General Description
The Valve,bleeder,hydraulic System, cataloged under National Stock Number 4820-01-574-3301, 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. 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
4820-01-574-3301
Primary Part Number
6610 M4M7 1/2-20 UNF-2A
Item Name
Valve,bleeder,hydraulic System
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (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 4820-01-574-3301?
NSN 4820-01-574-3301 is a Valve,bleeder,hydraulic System, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-574-3301?
NSN 4820-01-574-3301 has 1 manufacturer part number on file: 6610 M4M7 1/2-20 UNF-2A (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).
What are the specifications of 6610 M4M7 1/2-20 UNF-2A?
Key specifications for 6610 M4M7 1/2-20 UNF-2A: Part Name Assigned by Controlling Agency: VALVE, BLEED; End Item Identification: MISC MECHANICAL HARDWARE. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-574-3301 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.