Helping our Customers Achieve the Incredible

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At John Henry Foster- St. Louis, we love a good challenge.
Helping you- our valued customers, overcome obstacles, improve efficiency, and maximize your overall productivity- is our passion. From manufacturing automation (machine vision, motion control, custom test stands, and more), to fluid power (pneumatic and hydraulic components, assemblies, and systems), we have the tools and expertise to help improve your bottom line. Check out what's happening in our warehouse.

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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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      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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