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ISO 1721:1974

Rock drilling — Extension drill-steel equipment for percussive long-hole drilling — Reverse-buttress-threaded equipments 1 1/16 and 1 1/4 in (27 and 32 mm)

Publication date:   Aug 1, 1974

General information

90.93 Standard confirmed   Dec 6, 2022

ISO

ISO/TC 82 Mining

International Standard

73.100.30   Equipment for drilling and mine excavation

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Scope

Specifies the basic dimensions for equipment. Gives a list of components; tabulates together with figures: shank adapters for central flushing, hexagon type and lug-shank type; extension rods; coupling sleeves; four-wing bits; reverse-buttress threads; hollow hexagonal bars for extension rods; hexagonal drill-steels.

Life cycle

NOW

PUBLISHED
ISO 1721:1974
90.93 Standard confirmed
Dec 6, 2022