Frequently Asked Questions

Frequently Asked Questions

Q. What is the difference between using a shield or a seal as a ball bearing closure?

Shields or seals are often installed to retain lubricant and to prevent contamination from entering the bearing. While a shield contacts the outer ring and does not come in contact with the inner ring, the seal generally comes in contact with both the inner and outer rings. Torque is lower with a shield than with a seal. Alternately, the seal provides a higher degree of protection from contamination. Shields and seals are available in a variety of materials and configurations.

Q. What is the purpose of the bearing retainer and what benefits accompany different retainer materials?

The retainer (also called cage or separator) is used to separate the balls and equally position them around the bearing raceway. Some retainer materials contain lubricant for extended bearing life. Retainers for ball bearings are generally available in two designs. The most universal is a 2-piece closed ball pocket design called a ribbon retainer. A single piece open ball pocket design is called a crown retainer. Crown retainers are available in a variety of metal and non-metal options. MANU offers 440C steel retainers in both crown and ribbon designs and plastic crown retainers in polyamide material. Polyamide retainers are excellent options for high-speed applications.

Q. What is the purpose of bearing lubrication?

Bearing lubrication is an essential element of bearing selection, as it:

  • Extends fatigue life of the bearing by reducing wear and friction between the mating components of the bearing assembly.
  • Prevents corrosion and extends shelf life.
  • Provides a level of protection from foreign material entering the rolling elements.
  • Reduces the noise level of the bearing, lowers torque, and assists the bearing in reaching maximum operating speed.

Q. What types of bearing cages are manufactured by MANU?

We manufacture following type of metal & polyamide cages in our facilities:

Sheet Metal Ball Bearing Cages

  • Claw/Prong Type Ball Bearing Cage
  • Riveted Ball Bearing Cage
  • BL-type or Flat Rivet Cage

Special Cages

  • Nitro-Carburizing Cage
  • Tuftride Cage
  • Stainless Steel Cage

Q. Can MANU provide products outside of its standard product offering?

While MANU's primary focus is on the wide array of products manufactured at our facilities, we can provide product outside of our manufacturing capabilities. We offer this advantage as a one stop shopping service for our customers.

Q. I do not see a design to fit my application on your website. Can you help me design a custom bearing component?

Yes! Technical expertise is available to assist with design engineering for custom products. Available options include, but are not limited to, custom retainers, dust shields, sheet metal components, valve stem seal stampings, etc. in metal & non-metal. We look forward to working with you to satisfy your rotary motion requirements.

Q. If you do the design for me, can I review the design before it is made?

We supply customers with an e-drawing of his part prior to it entering production. This is a 3-D model of the part and provides the client the ability to verify dimensions, view it from all angles, view section cutaways to inspect the inside and dissemble to view each part that makes up the assembly. This model is a simple html file and requires no special software to run, just a web browser.

Q. How can I send you my product design?

An electronic CAD file is the best way. Ideally a 3D model such as Solidworks or an IGES file works best. Otherwise, AutoCAD dxf or dwg drawings will suffice. If you don't have CAD capability, fax (+91 141 277 1410) or e-mail ( us your hand sketch and we can take it from there.

Q. What is your return policy?

If there is a problem with the product, please contact us right away. We will replace, at no cost, any product not manufactured in accordance with client approved e-drawings or any product not deemed to be of acceptable quality to both MANU and the client.

Q. What currency do you work in?

Our default currency is in USD. However, if you would find it more convenient, we can quote, invoice, and accept payment in GBP, EUR, JPY, and CAD. Pricing in alternate currencies will be based on the USD price, using our effective conversion rate, and we will hold alternate currency pricing for 30 days.