xiii Unit 9 Holes....................................................................................... 137 Drilled Hole............................................................................................................138 Bored Hole..............................................................................................................139 Reamed Hole..........................................................................................................139 Counterbored Hole. ...............................................................................................140 Countersunk Hole.................................................................................................140 Counterdrilled Hole..............................................................................................141 Spotfaced Hole.......................................................................................................141 Unit 10 Angles. .................................................................................... 159 Angular Dimensioning.........................................................................................159 Bevels. ......................................................................................................................159 Chamfers. ................................................................................................................160 Tapers......................................................................................................................160 Unit 11 Threads. .................................................................................. 179 Thread Terms and Definitions.............................................................................179 Thread Representations........................................................................................180 Thread Forms.........................................................................................................181 Thread Series..........................................................................................................181 Thread Class...........................................................................................................181 Thread Specifications............................................................................................182 ISO Metric Threads............................................................................................... 183 Pipe Threads........................................................................................................... 184 Unit 12 Machining Details. .................................................................. 199 Necks.......................................................................................................................199 Grooves...................................................................................................................200 Slots.........................................................................................................................201 Keyways and Keyseats...........................................................................................202 Flats. .........................................................................................................................202 Bosses and Pads.....................................................................................................203 Unit 13 Sectional Views....................................................................... 223 Working with Sectional Views.............................................................................223 Unit 14 Auxiliary Views........................................................................ 251 Auxiliary Views......................................................................................................251 Other Types of Auxiliary Views. ..........................................................................252 Unit 15 Geometric Dimensioning and Tolerancing................................ 256 GD&T Application................................................................................................261 GD&T Symbols......................................................................................................262 GD&T Terminology..............................................................................................263 Datums....................................................................................................................263 Material Condition and Material Boundary Modifiers....................................264 Additional Modifying Symbols. ...........................................................................267 Form Tolerances....................................................................................................269 Orientation Tolerances.........................................................................................272 Position Tolerances. ...............................................................................................272 Profile Tolerances. ..................................................................................................274 Runout Tolerances.................................................................................................275