• October is ESOP Month!
    Oct 8

    October is ESOP Month!

    Every October, the John Henry Foster Company celebrates Employee Ownership Month. This is a terrific opportunity to celebrate and recognize employee ownership, and an...
  • John Henry Foster Making an Impact as a Family Business
    Sep 27

    John Henry Foster Making an Impact as a Family Business

    "John Henry Foster selected as a 2019 St. Louis Business Journal's Family Business Honoree" The St. Louis Business Journal’s 2019 Family Business Awards honor...
  • Happy 80th Birthday, Mr Gau!
    Jul 16

    Happy 80th Birthday, Mr Gau!

    Click here for a short video tribute to Mr. Bob Gau Bob Gau's vision for the John Henry Foster Company of St. Louis has...
  • JHF and Schoellhorn-Albrecht Design Accommodating Ladders
    May 22

    JHF and Schoellhorn-Albrecht Design Accommodating Ladders

    Schoellhorn-Albrecht Machine Co., a local St. Louis customer of John Henry Foster, has designed and manufactured marine deck equipment for over 130 years. Their...

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      Air Compressors

      Our associates are empowered to perform at the highest level of quality so that we meet and exceed expectations.

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      Value Added

      Our associates are empowered to perform at the highest level of quality so that we meet and exceed expectations.

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      Hydraulic

      Our associates are empowered to perform at the highest level of quality so that we meet and exceed expectations.

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      Tool & Hoist Repair

      Our associates are empowered to perform at the highest level of quality so that we meet and exceed expectations.

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      Units Converter

      Our associates are empowered to perform at the highest level of quality so that we meet and exceed expectations.

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      Get in Touch   Contact Us
      Calculate Driven Sprocket Speed

      Enter Drive Speed, Drive Sprocket Diameter and Driven Sprocket Diameter to calculate Driven Speed

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      Calculate Gear Pump Estimated Displacement

      Enter Gear Outside Diameter, Gear Width and Gear Center Distance to calculate Gallons Per Minute (GPM) @ 1200 RPM.

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      Calculate Angled Hydraulic Cylinder PUSH-PULL

      Enter the Cylinder Bore diameter, PSI, Rod Diameter and Angle to calculate PUSH/PULL for a hydraulic cylinder mounted at an angle

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      Calculate Driven Sprocket Diameter

      Enter Drive Speed, Drive Sprocket Diameter and Driven Speed to calculate Driven Sprocket Diameter

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      Calculate Hydraulic Cylinder PUSH/PULL

      Enter the Cylinder Bore diameter, PSI and Rod Diameter to calculate PUSH/PULL for a hydraulic cylinder

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      Calculate V-Belt Length

      Enter Pulley Center Distance, Large Pulley Diameter and Other Pulley Diameter to calculate V-Belt Length

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      Calculate Sprocket Drive Speed

      Enter Drive Sprocket Diameter, Driven Speed and Driven Sprocket Diameter to calculate Drive Speed

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      Calculate Vehicle Speed

      Enter the Wheel Outside Diameter (not the rim size) and Axle RPM to calculate Vehicle Speed

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      Calculate Reservoir Capacity – Cylindrical

      Enter the Reservoir Diameter and Length or Height to calculate Cylindrical Tank Capacity in cubic inches/gallons

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      Calculate Hydraulic Motor Horsepower

      Enter the GPM and PSI (pressure) to calculate Horsepower

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      Calculate Reservoir Capacity – Rectangle

      Enter the Reservoir Length, Width and Height to calculate Rectangular Tank Capacity in cubic inches/gallons

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      Calculate Hydraulic Cylinder Speed

      Enter the Pump GPM, Cylinder Bore diameter, Stroke and Rod Diameter to calculate Cylinder Speed (Do not use fractions)

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      Calculate Input/Exhaust Volumes For Rephasing Cylinders

      Calculate Input/Exhaust Volumes to match the exhaust volume from one cylinder to the input volume of the next cylinder in a series

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