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S-PO deep hole with spiral screw specially designed for tapping the length of the attack is 2 times larger than the diameter of more than ~3 times the through hole of the screw thread tapping. The length of S-PO's teeth is designed shorter than the general screw thread, and acidizing is applied on the surface to reduce friction resistance when cutting, and increase the life of wire attack.
·Screwdriver precision grade：YAMAWA P level
·Screwdriver material：HSS-E
·Tooth number of cutting edge：S-PO 5tooth
·Surface treatment: acidification treatment
·Suitable for cutting materials: carbon steel, alloy steel, cast iron, Quenched and tempered steel and so on, which are less than 750N/mm2 of tensile strength.

It is recommended to use the tooth hole of 1.5 to 3 times the tapping depth of the tapping.