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ISO 2857:1973/Amd.1:1984

Действует
Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches; manufacturing tolerances on the threaded portion; amendment 1 — 4 стр.
ICS
25.100.50 Taps and threading dies / Метчики, резьбонарезные плашки