Active standard | Published: 01/08/1974

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)
(Forage des roches — Matériels pour forage percutant de longs trous — Équipements a filetage a butée inverse 1 1/16 et 1 1/4 in (27 et 32 mm))

Available languages: English, French

Available design: electronic design (pdf), Print design

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Detail information

Designation: ISO 1721:1974

Publication date: 01/08/1974

Pages: 6

Country: International technical standard

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Anotation

Description / 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.

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