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- Can have round, oval, flat and fillister heads.
- Intended to be screwed into pre-threaded holes in metal.
- May look like a bolt, but user drives it with a screwdriver instead of a wrench.
- Comes in coarse (24 threads per inch) and fine (32 threads per inch) sizes.
- They are sized according to diameter, thread and length. Example: a 6-32x3/4 means the screw has a 6-gauge diameter with 32 threads per inch and is 3/4” long.
- The round head type is most commonly used. The flat head type is used when the top must be flush with the surface.
- Oval heads are used in countersunk holes. Fillister heads are used in counter-bored holes.
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