PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R321Valve

Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok · NSN 6665-00-878-0480 · FSC 6665 · No Item Name Available
Verified by PartsTable
NSN 6665-00-878-0480 — this item is cataloged by the U.S. Government under National Stock Number 6665-00-878-0480. Primary manufacturer part number: R321.
Features
  • Valve — FSC 6665
  • 2 verified cross-references
  • Primary manufacturer: Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve, cataloged under National Stock Number 6665-00-878-0480, is classified within Federal Supply Class 6665 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameValve
FSC / FSG6665 — No Item Name Available (FSG 66)
ManufacturersCircor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (CAGE 28968)
Technical Specifications
ParameterValue
NSN6665-00-878-0480
Primary Part NumberR321
Item NameValve
FSC / FSG6665 / 66 — No Item Name Available
ManufacturerCircor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5945-00-259-9281SC-C-99065 INTERCHANGEABLE
Relay,electromagnetic
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5130-00-541-67295130-00-541-6729 INTERCHANGEABLE
Bit,screwdriver
General Services Administration Federal Supply Service
5935-00-794-2455130-1001-52 INTERCHANGEABLE
Connector,plug,electrical
Tabet Manufacturing Company, Inc. Dba Tabet Manufacturing Co Inc
4820-01-120-7212R-321 INTERCHANGEABLE
Valve,linear,directional Control
Clippard Instrument Laboratory Inc
Cross-Reference Index
Part NumberManufacturer
R321 PRIMARY Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA)
3111M2S Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok (USA)
Related Parts
5945-00-259-9281INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
SC-C-99065
5130-00-541-6729INTERCHANGEABLE
BIT,SCREWDRIVER
5130-00-541-6729
5935-00-794-2455INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
130-1001-52
4820-01-120-7212INTERCHANGEABLE
VALVE,LINEAR,DIRECTIONAL CONTROL
R-321

Frequently Asked Questions

What is NSN 6665-00-878-0480?

NSN 6665-00-878-0480 is a Valve, manufactured by Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok, classified under FSC 6665 (No Item Name Available). Status: active.

What are the part numbers for NSN 6665-00-878-0480?

NSN 6665-00-878-0480 has 2 cross-referenced part numbers: R321 (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok), 3111M2S (Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok).

What NSN replaces 6665-00-878-0480?

There are 4 known substitutes for 6665-00-878-0480: 5945-00-259-9281, 5130-00-541-6729, 5935-00-794-2455 and 1 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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