Worm Gear - Precision Worm Wheel Sets * All worms right hand threaded * Meshing angle 15° To be used for transmission construction without refinishing, making fast assembly possible. Material: Worm wheels - aeterna bronze VL22. Worms - 11SMn30+C. fracture tested, case hardened HRC 57±3 Axis Distance in Housing 22.62mm±0.05 Note: Item 103320303/103320403 worm only polished