Maintenance Technician Practice Test

Which type of tap is commonly used for most threading applications?

1. Bottoming tap

2. Plug tap

3. Taper tap

4. Splined tap

The correct answer is: Plug tap

The plug tap is widely regarded as the most versatile tap for general threading applications. It features a controlled taper that allows for easy entry into the hole while providing sufficient cutting thread for most tasks. Its design makes it suitable for starting threads in blind holes and can also fully engage with through-holes, making it a go-to choice for technicians. Using varied tap designs is essential depending on the specific requirements of threading, such as depth and type of hole. A bottoming tap, while effective for threading to the bottom of a blind hole, has a limited range of application compared to a plug tap. Similarly, a taper tap, which has a wider taper, is typically used for initial threading and rethreading tasks in newly drilled holes, but it may not be suitable for all types of threading needs. Lastly, a splined tap is a specialized tool not used for standard threading applications, making it less common. The versatility of the plug tap in creating quality threads in different materials and its ability to function in various threading situations makes it the preferred choice in many maintenance and repair settings.