WTMA Common Tools and Fasteners 5 — Questions and Answers
Question 1: A stud bolt differs from a regular bolt in which way?
- A stud has a hex head on both ends
- A stud is fully threaded with no head, threaded into one part and nutted on the other (Correct answer)
- A stud is always made of stainless steel
- A stud has a larger diameter shank than its threaded sections
Correct answer: A stud is fully threaded with no head, threaded into one part and nutted on the other
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?
- It pre-cuts the threads so the screw needs less torque
- It prevents the wood from splitting and guides the screw straight (Correct answer)
- It countersinks the screw head automatically
- It increases the holding strength by compressing wood fibers
Correct answer: It prevents the wood from splitting and guides the screw straight
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?
- Hex bolt
- Carriage bolt (Correct answer)
- Eye bolt
- Shoulder bolt
Correct answer: Carriage bolt
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?
- Ez-out / screw extractor (Correct answer)
- Center punch
- Tap
- Reamer
Correct answer: Ez-out / screw extractor
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?
- A fastener with 19 threads per inch
- A fastener with 19mm across the flats (wrench flat distance) (Correct answer)
- A fastener with 19mm thread diameter
- A fastener rated for 19 N·m torque
Correct answer: A fastener with 19mm across the flats (wrench flat distance)
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.
Question 6: Which type of hammer is most appropriate for driving steel punches and chisels?
- Claw hammer
- Ball-peen hammer (Correct answer)
- Rubber mallet
- Sledgehammer
Correct answer: Ball-peen hammer
A ball-peen hammer has a hardened steel face designed to strike punches, chisels, and other hardened tools without mushrooming.
Question 7: What does 'thread pitch' refer to in fastener specifications?
- The angle of the thread helix relative to the bolt axis
- The distance between corresponding points on adjacent threads (Correct answer)
- The depth of the thread cut into the fastener
- The hardness rating of the threaded material
Correct answer: The distance between corresponding points on adjacent threads
Thread pitch is the axial distance from one thread crest (or root) to the next, measured in millimeters (metric) or threads per inch (imperial).
WTMA Common Tools and Fasteners 5
A stud bolt differs from a regular bolt in which way?