ISO-8830-1991.pdf
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1、INTERNATIONAL STANDARD First edition 1991-10-15 High-speed steel machine taps with ground threads - Technical specifications Tarauds B machine, en acier rapide, 5 tilefs recfifi The above formula does not apply to pipe thread taps. Table 3 gives the number of threads on the chamfer lead, the flute t
2、ypes, and the corresponding desig- nation. Table 3 Symbol Number of fhreads on the chamfer lead Flute types I A Straight I t- B 3.5 to 5,5 Straight with spiral point I I c I 2 to 3 T/-y/ Straight or helix I 1) For very short blind holes and should be avoided. I 5 Circular run-out tolerances - on the
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- ISO 8830 1991
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