Digga North America 12in Rock Combo Auger

Description

Satisfy commercial foundation pier diameter standards through rocky soil with the Digga RC4-12-3-MFT Rock Combo Auger. This 12-inch bit mounts to compact excavators for drilling utility poles and pier footings. Multi-facet tungsten teeth chew through caliche and broken shale without dulling. The four-foot length requires an extension shaft if you drill deeper than frost lines.

Milled from heavy-wall seamless alloy mechanical tubing, the main tube withstands high rotational shock from compact planetary drives. Heavy steel flighting carries 5/16-inch plate thickness to handle aggregate erosion. Designed for drive motors delivering up to 3,500 foot-pounds of torque, the bare tool weighs 88 lbs net. Dimensions span 12 inches in diameter by 48 inches in height, finished in high-visibility yellow powder coat.

Key Features of Digga RC4-12-3-MFT

Foundation contractors buy Digga RC4-12-3-MFT tooling for light pole bases and deck piers in rocky ground. Sensible commercial auger pricing provides reliable tungsten cutting teeth that reduce rental expenses for heavy drilling machinery.

• Twelve-inch cutting diameter clears neat holes for commercial footings and utility bases
• Four-foot overall length maneuvers in restricted urban spaces and equipment trailers
• Multi-facet tungsten carbide teeth shatter fractured rock and hardpan with low wear
• Continuous steel flighting carries aggregate rubble up to the surface without jamming
• Tungsten carbide pilot point guides accurate vertical starts on uneven stone ledges
• Two-inch round collar connection slides onto standard compact excavator drive shafts
• Heavy welded tooth holders resist failure when striking buried aggregate and boulders
• Optimized cutting head geometry reduces machine cabin vibration during rock penetration

Torque Load Runout Realities

Field testing on an 18-GPM carrier shows center shaft runout below 0.014 inches total indicator reading over four feet. Outer flight deflection holds under 0.030 inches under 2,200 foot-pounds of torque. Free rotation at 64 RPM drops to 40 RPM in rocky hardpan while hydraulic circuit pressure climbs to 2,300 PSI. If the teeth encounter an embedded six-inch boulder, line pressure spikes toward 2,900 PSI, requiring the operator to pulse the boom up and down to clear debris.

Field Usability Service Demands

A single worker can carry this 88-pound auger or guide it onto a drive hub. The round drive hub fits onto gearbox shafts without binding when clear of grit. Tooth swaps take under five minutes with a hand hammer and punch. Do not purchase this rock combo tool for soft wet sand or swamp mud where broad dirt teeth drill faster.

• Coat the round hub socket with grease to prevent seizing on the output shaft
• Inspect tungsten teeth each day for impact cracks after boring into buried rock
• Clean abrasive aggregate dust from tooth pockets before driving in fresh pins

Factory Warranty Manifest Details

Digga protects this auger with a standard 1-Year manufacturer warranty on structural steel tubing and factory welds. The factory shipping bundle contains the 12-inch auger body, multi-facet tungsten teeth with pins, a rock pilot bit, and an instruction sheet. Power units and hoses require separate purchase.