PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

406-APiston,valve

Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. · NSN 4820-01-551-6602 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-551-6602 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-551-6602. Primary manufacturer part number: 406-A.
Features
  • Piston,valve — FSC 4820
  • Valve Size for Which Designed: 0.750 INCHES IN
  • Material: STEEL COMP 416
  • Valve Design Control Activity: 23724
  • Valve Model Number for Which Designed: V SERIES
  • Valve Type for Which Designed: RELIEF
  • 1 verified cross-reference
  • Primary manufacturer: Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Comp 416 construction
General Description

The Piston,valve, cataloged under National Stock Number 4820-01-551-6602, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-551-6602
Primary Part Number406-A
Item NamePiston,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerRuthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.
StatusACTIVE
Valve Size for Which Designed0.750 INCHES IN
MaterialSTEEL COMP 416
Valve Design Control Activity23724
Valve Model Number for Which DesignedV SERIES
Valve Type for Which DesignedRELIEF
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5930-00-407-4149406A INTERCHANGEABLE
Switch,rotary
Lucent Technologies Inc Corporate Headquarters
5930-00-642-9302 INTERCHANGEABLE
Switch,push
6240-00-898-9190 INTERCHANGEABLE
Lamp,flashtube
6625-00-937-6528406A INTERCHANGEABLE
Oscillator,power
Te Connectivity Corporation Dba Microdot Products
6625-00-984-0188406A INTERCHANGEABLE
Bolometer,radio Frequency
General Microwave Corporation Div Kratos Microwave Electronics
6625-01-004-8600406A INTERCHANGEABLE
Analyzer,electrical Pulse
Advanced Measurement Technology Inc
Cross-Reference Index
Part NumberManufacturer
406-A Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. (USA)
Related Parts
5930-00-407-4149INTERCHANGEABLE
SWITCH,ROTARY
406A
5930-00-642-9302INTERCHANGEABLE
SWITCH,PUSH
6240-00-898-9190INTERCHANGEABLE
LAMP,FLASHTUBE
6625-00-937-6528INTERCHANGEABLE
OSCILLATOR,POWER
406A
6625-00-984-0188INTERCHANGEABLE
BOLOMETER,RADIO FREQUENCY
406A
6625-01-004-8600INTERCHANGEABLE
ANALYZER,ELECTRICAL PULSE
406A

Frequently Asked Questions

What is NSN 4820-01-551-6602?

NSN 4820-01-551-6602 is a Piston,valve, manufactured by Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-551-6602?

NSN 4820-01-551-6602 has 1 cross-referenced part number: 406-A (Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.).

What NSN replaces 4820-01-551-6602?

There are 6 known substitutes for 4820-01-551-6602: 5930-00-407-4149, 5930-00-642-9302, 6240-00-898-9190 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 406-A?

Key specifications for 406-A: Valve Size for Which Designed: 0.750 INCHES IN; Material: STEEL COMP 416; Valve Design Control Activity: 23724; Special Features: USED ON 3/4" V SERIES PISTON GUIDED RELIEF VALVES, VARIOUS. 6 total characteristics are documented in the Federal Logistics Information System.

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