Technical Drawing for Mechanical Design

Study Questions for Step 7

• List and describe the two (2) major classifications of fasteners:
• List the four (4) basic applications of threads:
• Define the following thread terms:
  External threads
  Internal threads
  Axis
  Major diameter
  Minor diameter
  Pitch diameter
  Pitch
  Root
  Crest
  Depth of thread
  Angle of thread
  Series of thread
  Lead
  Single thread
  Multiple threads
  Taps & Dies
  Length of thread
• Name the seven standard thread forms, indicate how each is used, and sketch an example of each:
• List the three (3) methods for determining the number of threads per inch on a fastener:
• How is the "pitch" of a thread calculated?
  In inches?
  In Metric?
• List the three (3) methods for representing threads on drawings and sketch an Internal and an External example of each:
• What is a "thread call-off"?
• What do the following "thread call-offs" mean?
  
  1/2 - 13UNC - 2A x 3 LG
  
  M 8 x 1.25 - 6 g
  
• List four (4) non-threaded fasteners:
• Describe the following fasteners and indicate how each is used:
  Bolt
  Nut
  Plain washer
  Lock washer
  Set screw
  Machine screw
  Cap screw
• Describe and sketch the following types of heads found on screws:
  Hex
  Slotted
  Philips
  Socket
  Torx
• Sketch the difference between a "Key Seat" for a shaft and "Keyway" for a hole:
  
  

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