Back to Products Page ST11 Special Shape Back-up Ring For special applications. Seal Size Selector – Request a Quote Inch - Available in 0.001inch increments mm - Available in 0.01mm increments Seal Size Selector – Request a Quote Select Measurement Units*Inch - Available in 0.001inch incrementsmm - Available in 0.01mm incrementsDiameter (A)*Enter shaft, rod or bore diameterDiameter (D)*If recommended size is not feasible, please enter your preferred dimensionsSeal Housing Width (L)*If recommended size is not feasible, please enter your preferred dimensionsQuantity*Seal MaterialApplication*NewExistingNote Back to Products page