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Small Boring Unit The Small Boring Unit-A is a small diameter cutterhead and thrust bearing assembly (from 24 in / 600 mm to 72 in /1.8 m) that can be used with any auger boring machine (ABM) from 36 in (900 mm) to 72 in (1.8 m). The SBU-A is welded to the lead casing. The contractor-supplied auger pilots directly onto a taper hex shaft in the thrust bearing assembly. The SBU-A contains a high-thrust bearing and is equipped with mini disc cutters available in three sizes depending on your project. It can be steered to maintain line and grade.
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