Session 2: Automotive Nuts
Unit 2: Fasteners
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. A nut is a type of fastener with a …………….hole.
Ans: threaded
2. For joining two metal parts, the nut is screwed ontothe……………..
Ans: bolt
3. The ………………of the bolt and nut must be same else the nutcannot be ……………on the bolt.
Ans: pitch, screwed
4. A nut can have left hand or right hand ……………..threads.
Ans: threaded
5. A hexagonal nut is a type of metal fastener that has ………….sides.
Ans: six
B. Multiple choice questions
1. Which factor of the bolt and nut must be same for the nut to bescrewed on the bolt?
(a) Pitch
(b) Minor diameter
(c) Root
(d) Flank
Ans: (a) Pitch
2. Which of the following is a hexagonal nut?
Ans: (a)
3. Which nut is used to join two externally threaded rods together?(a) Coupling
(b) K-lock or Kep
(c) Square
(d) None of the above
Ans: (a) Coupling
4. Which nut is used specifically in automotive bearing or wheel hub to spindle assemblies?
(a) Slotted Hex Nuts
(b) Prevailing torque lock
(c) K-lock or Kep
(d) Square
Ans: (a) Slotted Hex Nuts
C. Answer the following questions
1. Describe the importance of nuts.
Ans: Nuts are important fasteners used with bolts and screws to holdcomponents firmly together. They help in creating strong joints, allow easyassembly and disassembly, and are widely used in automotive and machineapplications.
2. Why are nuts made of four or six faces?
Ans: Nuts are made with four or six faces to provide better grip for toolslike spanners and wrenches. This shape allows easy tightening and looseningand ensures proper torque application.
3. What is the importance of threads in a nut?
Ans: Threads in a nut help it to mate properly with a bolt or screw. Theyprovide holding strength, prevent slipping, and ensure a tight and securefastening.
4. What do you understand by ISO metric thread?
Ans: ISO metric thread is a standardized thread system followedinternationally, including India. In this system, all dimensions are measuredin millimetres and the thread angle is 60°.
5. Name the different types of nuts.
Ans: The different types of nuts are hexagonal nut, square nut, slottednut, castellated nut, wing nut, coupling nut, and lock nut.
6. Name the different types of machine screws.
Ans: The different types of machine screws are flat head screw, roundhead screw, pan head screw, cheese head screw, and countersunk head screw.
