Standard Swedish standard · SS-ISO 1721:2020

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) (ISO 1721:1974, IDT)

Status: Valid

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Standard Swedish standard · SS-ISO 1721:2020

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Scope

This International Standard specifies the basic dimensions for reverse-buttress-threaded extension drill-steel equipment for percussive long-hole drilling, of the following nominal sizes :
1 l/16 in light (27 mm)
1 l/4 in light (32 mm)

Subjects

Drilling and mine excavation (73.100.30)

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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) (ISO 1721:1974, IDT)

Subjects

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