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Chapter 3 Screw It or Glue It: Fastening and Joining Parts 59
FIGURE 3-4 Ten-step tapping procedure
8. Once you’ve gotten to the bottom of the hole, or through the material,
unscrew the tap all the way back to remove it.
9. Wipe, rinse, or blow away any metal chips and excess tapping fluid.
10. Try screwing the 4-40 screw into the hole. Ta da! It should twist in easily.
Head and Drive Styles
The next important considerations with screws and bolts are the head style and drive
style. Figure 3-5 illustrates some common drive styles.
