Profile: Terhorst Mfg. Inc. manufactures agriculture-related products, aircraft parts, household items and recreational products. Our manufacturing capabilities include design & build injection molds, prototypes, secondary machining, insert molding, assembly and molded prototypes. Our engineering services include mold and part design. Our products include agitators, tank adapters, street elbows, roller ends, tank fitting, idler sprockets, self aligning bearing and oil line clamps.