WTMA Common Tools and Fasteners 5

Question 1

A stud bolt differs from a regular bolt in which way?

Accepted Answer

A stud is fully threaded with no head, threaded into one part and nutted on the other

Answer

A stud bolt has no head; one end threads permanently into a tapped hole and the other end receives a nut to clamp components together.

Question 2

What is the purpose of a pilot hole when driving a wood screw?

Accepted Answer

It prevents the wood from splitting and guides the screw straight

Answer

A pilot hole drilled slightly smaller than the screw shank prevents wood splitting and guides the screw into proper alignment.

Question 3

Which fastener is specifically designed to prevent rotation using a non-circular shank that fits a matching hole?

Accepted Answer

Carriage bolt

Answer

A carriage bolt has a square shoulder under its round domed head that embeds into wood (or a square hole in metal) to prevent rotation while tightening the nut.

Question 4

What tool is used to extract a broken bolt that has snapped off flush with or below the surface?

Accepted Answer

Ez-out / screw extractor

Answer

A screw extractor (Ez-out) is drilled into the broken bolt and then turned in reverse to grip and remove the broken fastener.

Question 5

A wrench marked '19mm' will fit which fastener head?

Accepted Answer

A fastener with 19mm across the flats (wrench flat distance)

Answer

Wrench size refers to the distance across the flats (AF) of the hex head, so a 19mm wrench fits a fastener measuring 19mm between opposite flat faces.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA Common Tools and Fasteners 5