Question 1

What is the difference between Type A, Type B, and Type C self-tapping screws?

Accepted Answer

Type A has a sharp gimlet point for thin sheet metal (0.5–1.5mm). Type B has a blunt point with finer pitch for thicker materials. Type C has machine screw thread pitch for use with pre-formed holes in castings.

Question 2

What drive types are available?

Accepted Answer

We offer Phillips (#1, #2, #3), Pozi (#1, #2), Hex (internal and external), Torx (T10–T40), and combination drives. Torx is recommended for automated assembly lines.

Question 3

What plating options do you offer?

Accepted Answer

Standard: zinc electroplated (blue/yellow/black passivation, 5–12μm). Premium: zinc-nickel, Geomet, mechanical zinc, nickel plating, black phosphate. Stainless steel (A2/A4) also available.

Question 4

What is the difference between thread forming and thread cutting screws?

Accepted Answer

Thread-forming screws displace material to create the thread (no swarf). Thread-cutting screws have a cutting edge that removes material like a tap. Thread-forming is preferred for softer materials and provides better vibration resistance.