Author Question: What type of head is the most common for screws used on unit covers? A) Hex head B) Allen head C) ... (Read 92 times)

123654777 · **on:** Jul 24, 2018

What type of head is the most common for screws used on unit covers?

A) Hex head B) Allen head C) Square head D) Round head

Question 2

What is the difference between the way a self-threading and a self-drilling sheet metal screw is used?

A) Self-threading screws must have a pilot hole.
B) Self-threading can only be installed with a counterclockwise rotation.
C) Self-drilling can only be installed with a counterclockwise rotation.
D) Self-drilling screws must have a pilot hole.