COMMON FASTENING AGENTS 261 



2. State the advantages and disadvantages of a wire nail. 



3. What advantage has a screw over a nail, as a fastening agent? 



4. Explain the manufacture of screws. 



5. What is a bolt? 



6. Explain the construction of different screw threads. 



7. What are the advantages and disadvantages of each? 

 Draw sketches. 



8. Define the following terms: thread, triple thread, pitch, 

 lead, point, depth of a thread, root of thread, root diameter, pitch 

 of screw, number of threads to the inch. 



9. What are the uses of the different screw threads? 



10. How is a thread placed in a hole? 



11. What is a tap? 



12. What are the standard hand-taps? 



13. How would you determine the size of a tap drill for a thread? 



