112mm spiral PDC core bit
The 112mm spiral PDC core bit is engineered for geological coring and geotechnical investigation. Its spiral crown profile and face-discharge geometry keep PDC cutters engaged with rock along a longer cutting path per revolution, while curved channels lift cuttings outward and away from the core barrel. This prevents regrinding and reduces core jamming in limestone, basalt, gneiss, and other medium-to-hard formations . The thin-wall single-tube design minimizes annular cutting area, lowering frictional heat and improving core recovery efficiency.
Applicable Engineering Scenarios
| Project Type | Specific Use | Fit Rationale |
|---|---|---|
| Mineral exploration | Coring and logging in limestone, gneiss, basalt | Spiral discharge reduces blockage; consistent run length |
| Hydropower investigation | Dam foundation and tunnel wallrock sampling | Thin wall lowers WOB requirement; less hole deviation |
| Road & railway geotech | Bridge pier and tunnel portal rock sampling | Single-tube fast coring for medium-depth holes |
| Dimension stone quarrying | Grade sampling in marble and bluestone deposits | Representative core; thin wall yields larger core diameter |
| Geotechnical testing | Bearing capacity assessment in tuff and weathered basalt | Smooth discharge; adaptable to fractured ground |
Specifications
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Outer Diameter : 112mm
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Design : Spiral crown, thin-wall single tube
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Applicable Formations : Limestone, bluestone, marble, gneiss, basalt, tuff
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Standard Size Range : 76mm / 93mm / 112mm / 132mm / 151mm / 171mm
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Key Feature : Spiral waterways direct cuttings toward gauge zone, reducing regrinding energy loss
Why Spiral Crown Over Flat Profile
Flat-profile bits tend to trap cuttings in hard rock, causing PDC cutters to regrind debris and lose penetration rate. The spiral crown creates longer cutting paths per revolution and channels debris outward—not inward toward the core barrel—directly reducing jam risk. In abrasive formations such as gneiss and basalt, this translates to longer runs per trip and more meters cored per shift.