ADVANCED MECHANICAL DRAFTING. LECTURE #3. DRILLED. REAMED. BORED. Common Hole Types. COUNTERBORED. SPOTFACED. COUNTERSUNK. Ø.250 (1/4) THRU or Ø.250 (1/4) .50. DRILLING. Drill size chart. Specifying drilled holes on drawings. Drill names. CLEARANCE HOLES.
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¼” SOCKET HEAD CAP SCREW & ¼” MEDIUM LOCK WASHER
Dimensions are normally rounded to two (2) places (hundredths), but may be rounded to three or four places if tighter tolerances are required or if dimension corresponds to a tool size