ATEX Certified Gearboxes

STOBER has ATEX certified gearboxes for explosive environments.  Our ATEX rating meets 2014/34/EU directive, has a protection level for gas and dust, and can handle temperature class of T4 and T3 (275-392°F).

Having an ATEX certified gearbox can:

  • Help certify your machine as ATEX rated
  • Protect against potential ignition source, such as mechanically generated sparks, electrostatic discharge, and high surface temperatures

ATEXOur gearboxes can be configured to accept a manual override, such as a hand wheel or wrench.  STOBER’s solutions can be designed to fit your needs.

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STOBER’s SMS Gearboxes for mechanical flexibility

Did you know you did not have to use a planetary gearbox on every servo application? STOBER’s ServoFit Modular Series (SMS) gives you mechanical flexibility. A variety of housing and output options means you can pick what you need and mount it to your machine. Another advantage of the SMS is higher input speeds, especially on the right angle gearbox.

In addition to being quieter than a planetary gearbox, there are more ratios to choose from, providing you with more options. These units can also come in food and beverage duty and the right angle has a stainless steel version.

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Automotive Manufacturing Industry

“69% of machine designers state that shorter product development schedules is the top machine design challenge.”The Aberdeen Group

Are you driven by shorter product development cycles and faster cycle times? Need quick delivery and response?  STOBER has 24/7 customer service and can build and ship your gearbox in one day.  Our applications engineers will get you a drawing and answer any questions you have.  Don’t waste time waiting for your gearbox to arrive.  Call STOBER today!

Learn more about STOBER’s ideal solutions for for the automotive manufacturing industry at

Packaging Solution


69% of machine designers say shorter product development schedules are their top challenge, according to the Aberdeen Group. Optimize Floor Space. Reduce Components. Simplify Design. STOBER can help you do all of that and more. Talk to our engineers who have done tens of thousands of packaging machines.

p series
Standard Solution

Traditional planetary gearboxes require additional components, such as belts, pulleys, mounting brackets, guards, and more. These extra pieces mean longer installation times, more cost, and increased operating danger.

Contact us today at 606-759-5090 to learn how we can reduce your development schedule for your packaging machine.

STOBER Solution

PS Two-Speed Gearbox

Do you want to have both high cutting speeds and high torque for your machine tool spindle? The STOBER PS Two-Speed gearbox can provide both high speed and high torque in one package.

With its integral planet gear set, the PS provides:two-speed gearbox

  • maximum running smoothness
  • optional liquid cooling to achieve speeds of 10,000 RPM
  • versatile mounting for lathes or machining centers
  • mounting holes for easy installation

For more information on PS Two-Speed Gearbox, visit


Looking for a gearbox solution for your mixer?


Any mechanical device used over food production must be of the highest quality. Products that leak oil are not an option!

STOBER’s KS is ideal for dynamic mixing processes. The agitators can be mounted to the rotating flange supported by stout tapered bearings. The hollow bore also allows for air lines to pass through, which are used in the agitation process. The demanding nature of the dynamic mixing is no problem for the KS.

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STOBER continues to add to its Food and Beverage Offerings

kss hollowCustomers need a reliable and durable gearbox that can withstand the harsh conditions of food or beverage environments. STOBER currently has three sizes with its stainless steel right angle gearbox, the KSS. The company is introducing its fourth size, capable of generating output torques up to 4,872 in. lbs. The KSS4 is compatible with NEMA 56C, 143/145TC, and 182/184TC frame motors.

The expansion is perfect for poultry, pork, and beef processing. The stainless steel housing won’t pit if blood gets on the surface. In addition to its durable housing, the KSS is IP69K Certified and USDA Accepted. All of our gearboxes come with a 3 year standard warranty. However, our average mean time to failure is 8 years. Trust a STOBER KSS to last with no downtime and no maintenance.

To learn more about the KSS4, visit our website at

How are you driving your conveyor?

belt pulleyHow do you drive your conveyor? Do you use a belt and pulley? This makes for a lot of extra work. You have to find the pulley, belt, guard, bracket, and screw. Then you have to attached the mounting bracket to the frame, attach the gearbox to the bracket, put the pulley on the gearbox, attach the belt, adjust the tension, and finally put on the guard.

offset helicalWouldn’t it be easier to avoid this assembly work? STOBER can help you do this! Our “F” series gearbox can be attached directly to the load. You can save space and money by avoiding the auxiliary components. Contact STOBER’s technical support team to learn how to save money and space on your conveyor!

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Packaging Conveyor Savings

Are you missing opportunities for improving efficiency and saving money on your conveyor? A typical conveyor used in packaging for feeding product into another machine utilizes a gearbox and additional components to drive the conveyor. These various pieces add up in terms of cost and length. However, STOBER offers product that will eliminate the need for a secondary transmission. This will not only save you money, but also space.


As illustrated, the planetary unit needs a mounting bracket and coupling to drive the conveyor. STOBER offers the SMS product line, which creates space savings with various mounting and housing styles. The KL unit can be attached with a shrink disc, making a compact solution. This machine flexibility will allow you to utilize existing structures as well.

Space is not the only savings. Using the SMS line creates an opportunity for lowering cost. No second transmission, such as chains and belts, are needed. This means a quieter and more efficient solution. No hardware, installation, or maintenance costs are added to your application.

Contact STOBER’s technical support team to learn how to save money and space on your applications using STOBER’s SMS products!

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STOBER Adds New Sizes to PHQ Gear Series

STOBER Drives, Inc., a high-efficiency gearbox manufacturer in Maysville, Ky., wants to remind you of all the sizes available for its PHQ series.

The PHQ is available in sizes 4, 5, 7, 8, 9, 10, and 11. How does it differ from STOBER’s PH unit? The PHQ features a high torque, four-planet design, allowing torque to be distributed over four planet gears instead of three. This results in an increase in output torque and torsional rigidity, while still providing low backlash and smoothness of operation.phq

The PHQ4 and PHQ5 are available in single and double stage, with ratios ranging from 5.5:1 to 55:1. These gearheads are capable of 430 Nm of acceleration torque. The PHQ7 thru PHQ11 are available in double and triple stage, with ratios ranging from 22:1 up to 600:1, and up to 22,000 Nm of acceleration torque.

With a backlash rating of three arc minutes, the PHQ is ideal for applications requiring low backlash, such as robotics, injection molding for plastics, and tube-bending industries. For applications requiring even lower backlash, the PHQA version is capable of having backlash as low as 1 arc minute.

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