page_title: Helix angle
section_title: Helical gear
hierarchical_section_title: Helix angle / Applications / Helical gear
caption_attribution_description: English: Worm hand
context_page_description: In mechanical engineering, a helix angle is the angle between any helix and an axial line on its right, circular cylinder or cone. Common applications are screws, helical gears, and worm gears.
  The helix angle references the axis of the cylinder, distinguishing it from the lead angle, which references a line perpendicular to the axis. Naturally, the helix angle is the geometric complement of the lead angle. The helix angle is measured in degrees.
context_section_description: In helical and worm gears, the helix angle denotes the standard pitch circle unless otherwise specified. Application of the helix angle typically employs a magnitude ranging from 15° to 30° for helical gears, with 45° capping the safe operation limit. The angle itself may be cut with either a right-hand or left-hand orientation. In its typical parallel arrangement, meshing helical gears requires that the helix angles are of the same magnitude and cut oppositely .
caption: Helical and worm handedness
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