API SPEC 11b

provides the industry requirements for sucker rods and some related sucker-rod lift equipment. The three main grades of API spec 11b  steel rods follow:

  • Grade C rods that have minimum and maximum tensile strengths of 90,000 and 115,000 psi, respectively.
  • Grade K rods that have a minimum tensile strength of 90,000 psi and a maximum strength of 115,000 psi. These rods are made with 1.65 to 2.00% nickel and are, therefore, more expensive than Grade C rods, but may have improved corrosion-related properties.
  • Grade D rods that have a minimum tensile strength of 115,000 psi and a maximum strength of 140,000 psi. Three types of this grade are covered by Spec. 11B: plain-carbon, alloy, and special-alloy steels.

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XPL Series

Series XPL from thread sizes for Watchmakers until large size diameters 400, 500 or 600 mm

XPL-C Series

Series XPL-C for thread sizes 1.0 mm to  large size diameters 200 or 300 mm.