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Tapping screws are a type of fastener designed to form or tap their mating threads into the material they are being screwed into. Here are the different types of tapping screws along with their characteristics:

  1. Type A:
  • Thread-forming screw with a gimlet point and coarse-pitch threads.
  • Used in punched or nested holes in metal sheets, treated plywood, or special asbestos compositions.
  1. Type B (Type Z):
  • Thread-forming screw with a blunt point and tapered threads of moderate pitch.
  • Used with punched, drilled, or nested holes.
  1. Type C:
  • Thread-forming screw with a blunt point, tapered threads, and UNC or UNF threads.
  • Designed for fastening metal sheets.
  1. Type D (Type EC):
  1. Type F:
  • Thread-cutting screw with multiple flute tapered end to facilitate tapping.
  • Same thread form as Type C.
  1. Type FZ:
  • Thread-cutting screw with multiple fluted tapered end.
  • Same thread form as Type B.
  1. Type G (Type EC):
  • Thread-cutting screw with a slot across the end to facilitate tapping in hard materials or deep holes.
  • Same thread form as Type C.
  1. Type H (Type DB or Type 25):
  • Tapping screw with the same thread as Type B but provided with a slot in the end to facilitate tapping in plastics.

Each type of tapping screw is designed for specific applications and materials, allowing for efficient and secure fastening in various situations.

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