PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

506APiston,linear Actuating Cylinder

Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. · NSN 3040-00-378-1123 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-00-378-1123 — this item is cataloged by the U.S. Government under National Stock Number 3040-00-378-1123. Primary manufacturer part number: 506A.
Features
  • Piston,linear Actuating Cylinder — FSC 3040
  • Material: STEEL CORROSION RESISTING
  • Outside Diameter: 0.998 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.
Applications
  • Applications requiring Steel Corrosion Resisting construction
General Description

The Piston,linear Actuating Cylinder, cataloged under National Stock Number 3040-00-378-1123, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.. Government technical data includes 2 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3040-00-378-1123
Primary Part Number506A
Item NamePiston,linear Actuating Cylinder
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerRuthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.
StatusACTIVE
MaterialSTEEL CORROSION RESISTING
Outside Diameter0.998 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
6665-00-690-5279 INTERCHANGEABLE
Radiac Set
6685-00-814-5271 INTERCHANGEABLE
Transmitter,temperature,electric
Cross-Reference Index
Part NumberManufacturer
506A Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. (USA)
Related Parts
6665-00-690-5279INTERCHANGEABLE
RADIAC SET
6685-00-814-5271INTERCHANGEABLE
TRANSMITTER,TEMPERATURE,ELECTRIC

Frequently Asked Questions

What is NSN 3040-00-378-1123?

NSN 3040-00-378-1123 is a Piston,linear Actuating Cylinder, manufactured by Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co., classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-00-378-1123?

NSN 3040-00-378-1123 has 1 cross-referenced part number: 506A (Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co.).

What NSN replaces 3040-00-378-1123?

There are 2 known substitutes for 3040-00-378-1123: 6665-00-690-5279, 6685-00-814-5271. Verify interchangeability with system specifications before substitution.

What are the specifications of 506A?

Key specifications for 506A: Material: STEEL CORROSION RESISTING; Special Features: W/0.812 IN. DIA AND 1.625 IN. DP 1 HOLE,W/0.187 IN. DIA 3 HOLES IN; Overall Length: 2.000 INCHES NOMINAL IN; Outside Diameter: 0.998 INCHES NOMINAL IN. 4 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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