Robbins Small Boring Unit

The Robbins Small Boring Unit (SBU)  24 to 72 inches (0.6 to 1.8 m) to cut through hard rock and mixed ground.

The SBU-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.

The majority of the crossings are 100 to 300 ft (30 to 90 m) long; however, there have been several contractors that have utilized the SBU on drives over 500 ft (150 m) in length. The length of the drive depends on the ground conditions. Contact us to discuss what the SBU is capable of on your specific job.

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