Reference number
ISO 1721:1974
ISO 1721:1974
© ISO 2025
International Standard
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)
Edition 1
1974-08
1974-08
ISO 1721:1974
6341
Published
(Edition 1, 1974)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
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.