Process Differences
The processes of creating tapped and threaded holes differ significantly:
Tapping Process: Tapped holes are made by drilling a hole and then using a tap to cut internal threads. The various types of taps include cutting taps, forming taps, taper taps and plug taps, which are suitable for different materials and thread sizes.
Threading Process: Threading tools or cutting tools are used to create threaded holes. The threading process can be done on both inside and outside threads as needed. Frequently, it takes several passes to achieve the correct depth and pitch of the desired thread.
Structural Differences
Tapped and threaded holes also exhibit structural differences:
Internal Threads vs. External Threads: Normally, a tapped hole has internal threads, and threaded holes can also have either external or internal threads, depending on the method applied.
Size Hole and Thread Sizes: The size of the hole is important to consider when choosing the corresponding thread size for both tapping and threading. These measurements are often governed by industrial guidelines like Unified Thread Standards or Metric Thread Standards.
Blind Hole vs Through Hole:Tapped holes survive as through or blind holes while threaded ones own different types such as through, blind and clearance holes.
Clearance Hole and Pilot Hole Definitions: Clearance holes in machining are a little larger than the screw diameter, which makes it easier to put them together. On the other hand, pilot holes are smaller, and they guide a tap or threading tool to make precise threads.
