IADC tricone roller cone classification system

• 4 character code, first 3 characters are numbers, the last is a letter

  1st number is the series. 1 to 3 represent a milled tooth tri cones, 4 – 8 represent TCI tri cones. The higher the series number the harder more abrasive the rock formation is.

  2nd number is the relative degree of hardness within a series. The number ranges from 1 – 4, the higher the number the harder the formation

  3rd number represents bearing design and gauge protection.

• Open bearing

• Roller bearing air cooled

• Open bearing gauge protected

• Sealed roller bearing

• Sealed roller bearing gauge protected

• Sealed friction bearing

• Sealed friction bearing gauge protected

      4th character is a letter and describes optional features. There are 16 alphabetic character's each representing the tricones most significant feature