This Pakistan Standard covers dimensions of core drills with parallel shanks and Morse taper shanks which a purchaser can reasonably expect to be stocked by a supp lier in the range of 3 to 16 mm diameter for the first and the range of 7.8 to 50 mm for the second.
PS 258/2-1979由PK-PSQCA 发布于 1979。
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