Damper Actuator Crankarm Ball Joint; Item Crankarm Ball Joint; Used On Item Direct Coupled Damper Actuator; Used On Model/Brand MS4109F/MS4609F/MS8109F; Used On Item Part No MS4109F1010/U, MS4109F1210/U, MS4609F1010/U; Bolt Size 1/4 Inch-28 UNF Male Threaded; Fits 5 to 16 Inch Diameter Push Rod