STUDY GUIDE: HARDWARE & FASTENERS

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A: Threads per inch, or TPI, is a measurement used to count the number of threads along the length of a standard fastener. Pitch measures the thread count on a metric fastener. Taking it to the Floor: Self-Tapping Screw • Often used for attaching gutters, window frames, electrical fi xtures or any material typically requiring a starter hole.

  Measurement, Hole