Grub Screw M7 Grub Set Screw hollow grub screw

Meaning of "M8" : In the screw specification, "M" stands for Metric thread, and "8" usually means that the main diameter of the thread (that is, the maximum diameter of the screw part) is about 8 mm. However, it should be noted that the "8" here is not directly equivalent to the diameter of the screw part, but a code for the thread specification. In actual use, the rod diameter of the M8 screw may vary slightly due to manufacturing standards, materials and other factors.

Wavy head shape: Wavy head refers to the special shape of the screw head, which is usually designed to increase the strength of the screw head, provide better holding power, or meet specific installation needs. The specific shape and size of the wave head may vary depending on the manufacturer and application.