Boston Gear helical gears feature a 45° helix angle for smooth, quiet power transmission between parallel or 90° non-intersecting shafts. Available in right- and left-hand versions with pitches from 6 TDP to 24 TDP, they offer strong teeth, high contact ratios, and excellent load capacity. Download free 3D CAD models (STEP files) from our Engineering CAD Library to check mesh geometry and speed up your drivetrain designs.