make the two angled sides symmetrical with the construction line. connect the middle of the short side with the middle of the opposite side with a construction line, and make it perpendicular to the axis of the cylinder. sketch a trapezoid with the short side towards the outside of the hole and parallel to the axis of the cylinder. 
Select the endpoint of the helix and then the helix curve. choose Clockwise/ Counterclockwise to match the thread handedness. select Height & Pitch and Constant pitch for the helix. (optionally select diameter between minimum internal pitch diameter and maximum internal pitch diameter for appropriate class thread) sketch pitch circle diameter = D – 0.64951905*P. select the face at the start of the hole to define the helix cross-section. Add thread relief at bottom of hole, if needed, with diameter >= D. Add thread relief at end of thread, if needed, with diameter = 0.5953925*P. Chamfer beginning of thread 30° with long side >= 0.5953925*P. (optionally select diameter between maximum external major diameter and minimum external major diameter for appropriate class thread) 
This procedure will generate accurate theoretical UN Inch or M metric threads without clearance (class 3/4H) having largest external thread and smallest internal thread (i.e. You probably will not want to do this every time as it will greatly increase the part size and load time, but it is necessary if you plan on 3D printing or molding your part. The steps below will guide you in creating realistic and accurate threads in SolidWorks.
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