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SP-V/N-SP-V spiral screw, with Tin surface coating processing can be applied to all types of alloy steel and non ferrous alloy material used for processing of a variety of materials. The problem of the disintegration of the teeth caused by the poor discharge of the chip was greatly reduced. ·Screwdriver precision grade：YAMAWA P level ·Screwdriver material：HSS-E ·The number of teeth in the cutting edge: 2.5 teeth ·Suitable cutting material： SP/N-SP tensile strength below 750N/mm2 medium carbon steel, copper, aluminum, magnesium alloy and so on... | |
