HOLE OPENERS
› Designed for the enlargement of pilot holes and large hole applications. Also used for road and river crossing applications.
› Manufactured from AISI 4145H fully heat treated alloy steel and available with carbide-milled teeth and insert cutters.
› Arms and cutters are hardfaced for protection in three different designs for varying conditions and rock formations. The design of the hole opener allows for field-changing of the cutters.
Hole Opener Components
Body – Forged of 4145 Heat Treat, quenched and tempered steel and range in overall length from 120” up to 132”. The tool meets API Specification 7 minimum material requirements for rotary drill stem elements.
Collector Box & Core Breakers – Welded to the hole opener body, the collector box or “cross” consists of two 2 ½” thick plates bridged by a 2” piece of A-36 steel, which is used for its suitability for welding. The thickness of the steel plates makes the collector box able to withstand weight and impact while rotating.
Mounts – The mounts are cast iron and register a Brinell hardness factor of 218 up to 223 with a 3,000 kg load, which provides strength while allowing welding. The mounts are weld-bevelled and machined to accommodate cutters before being welded to the cross. A hole drilled through the mount and the first plate of the collector box accommodates jets.
Cutters – Hole openers above 22” have a set of four cutters, which are cast to the same specifications as the mounts. The cutters are machined to fit mounts and to accommodate journals and bearings. Two of the cutters are left-hand spiralled and the other two are right-hand spiralled. Hole openers 17 ½” and below have a set of three cutters.
Jets – All hole openers, 30” and above, are fitted with 24/32 series 95 Smith jets. Jets are fused into a jet sleeve. The 24/32 jet is field-proven as the most proficient tool for cleaning cutters.
› View Spec Sheet
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