Global Precision Ball & Roller
178 Sunny Valley Road
New Milford, Connecticut 06776


Rockbit S-2 Steel Balls

Global Precision Ball & Roller is a leading supplier of S-2 Rockbit balls used largely in the oil and energy sector. We support key corporations with their requirements for balls in this material, used in mud-motor operations, and repair facilities that support this industry.

If you require a ball that will be able to handle the harsh environment of drilling applications, our S-2 Rockbit steel balls may be for you. They offer resistance to high-temperatures, are hard enough to handle the tough materials such as rock fragments and can withstand mud slurries.

At Global Precision, our team has spent many years in the industry. This has taught us that there is always a ball or bearing to help with your application and that choosing the right one can be challenging. There are plenty of compositions to choose from, and each comes with positives and negatives. If you are having trouble deciding if S-2 Rockbit steel balls are for your application, feel free to contact someone from our team. We will be happy to help.


  1. Carbon – 0.45% - 0.55%
  2. Manganese – 0.30% - 0.50%
  3. Sulphur - 0.030% Max
  4. Molybdenum – 0.30% - 0.60%
  5. Silicon – 0.90% - 1.10%
  6. Phosphorous – 0.30% Max
  7. Vanadium – 0.050% Max


The following are the mechanical properties and physical characteristics of our S-2 Rockbit Steel balls:

  1. Yield Strength – 290,000 PSI
  2. Tensile Strength – 310,000 PSI
  3. Reduction in Area – 25%
  4. Elongation in Inches – 7%
  5. Density – 0.283 lbs./cubic inch
  6. Modulus of Elasticity – 30,000,000 PSI
  7. Hardness – 54-60 on the Rockwell C


The oil and energy industry commonly use these balls for drilling applications. One may find them in the stack bearings of a downhole mud motor. They are either mud or oil lubricated depending on the application.


Each batch of our balls is put under quality assurance tests and thoroughly examined to ensure they meet our high standards. This ensures you will receive a quality product that will meet your needs.

ISO 9001: 2015 
ISO 14001: 2004
ISO TS 16949: 2009

178 Sunny Valley Road, New Milford, Connecticut 06776
Tel: 860-210-0808 | Fax: 860-210-0818 | Email:

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