PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A-3966Cylinder Assembly,actuating,line

Energy Manufacturing Co. Inc. · NSN 3040-01-291-9701 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-01-291-9701 — this item is cataloged by the U.S. Government under National Stock Number 3040-01-291-9701. Primary manufacturer part number: A-3966.
Features
  • Cylinder Assembly,actuating,line — FSC 3040
  • Overall Diameter: 3.750 INCHES NOMINAL IN
  • Mounting Provision for Which Designed: PIN(S)
  • Design Characteristics: SINGLE ACTING SINGLE CYLINDER
  • Features Provided: BLEEDER VALVES
  • Extended Length: 154.500 INCHES NOMINAL IN
  • Port Thread Class: 3B
  • First End Hole Diameter: 1.016 INCHES NOMINAL IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Cylinder Assembly,actuating,line, cataloged under National Stock Number 3040-01-291-9701, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Energy Manufacturing Co. Inc.. Government technical data includes 21 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
NSN3040-01-291-9701
Primary Part NumberA-3966
Item NameCylinder Assembly,actuating,line
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerEnergy Manufacturing Co. Inc.
StatusACTIVE
Overall Diameter3.750 INCHES NOMINAL IN
Mounting Provision for Which DesignedPIN(S)
Design CharacteristicsSINGLE ACTING SINGLE CYLINDER
Features ProvidedBLEEDER VALVES
Extended Length154.500 INCHES NOMINAL IN
Port Thread Class3B
First End Hole Diameter1.016 INCHES NOMINAL IN
Port StyleGASKET SEAL
First Piston Rod End StyleFORK TYPE (CLEVIS)
Compressed Length141.500 INCHES NOMINAL IN
Body Outside Diameter3.375 INCHES NOMINAL IN
Mounting Type and LocationFORK BOTH ENDS
First End Fork Width1.625 INCHES NOMINAL IN
Piston Rod End SimilarityIDENTICAL
First End Largest Inside Diameter1.016 INCHES NOMINAL IN
First End Fork Span Width1.250 INCHES NOMINAL IN
First End Fork Depth1.812 INCHES NOMINAL IN
Mounting Facility Diameter1.000 INCHES NOMINAL IN
Port Thread Quantity Per Inch18
Port Thread Diameter0.375 INCHES NOMINAL IN
Port Thread Series DesignatorUNS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5950-00-725-5862174A7624G6 INTERCHANGEABLE
Coil,electrical
Ward Leonard Ct Llc
5935-00-934-2579 INTERCHANGEABLE
Connector,receptacle,electrical
Cross-Reference Index
Part NumberManufacturer
A-3966 PRIMARY Energy Manufacturing Co. Inc. (USA)
Related Parts
5950-00-725-5862INTERCHANGEABLE
COIL,ELECTRICAL
174A7624G6
5935-00-934-2579INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL

Frequently Asked Questions

What is NSN 3040-01-291-9701?

NSN 3040-01-291-9701 is a Cylinder Assembly,actuating,line, manufactured by Energy Manufacturing Co. Inc., classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-01-291-9701?

NSN 3040-01-291-9701 has 1 cross-referenced part number: A-3966 (Energy Manufacturing Co. Inc.).

What NSN replaces 3040-01-291-9701?

There are 2 known substitutes for 3040-01-291-9701: 5950-00-725-5862, 5935-00-934-2579. Verify interchangeability with system specifications before substitution.

What are the specifications of A-3966?

Key specifications for A-3966: Overall Diameter: 3.750 INCHES NOMINAL IN; Mounting Provision for Which Designed: PIN(S); Design Characteristics: SINGLE ACTING SINGLE CYLINDER; Features Provided: BLEEDER VALVES. 22 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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