When your pile design calls for rock-socketed certainty, this single roller cone keeps the cut true. The conical compacts attack hard formations without chattering; the journal bearing runs quiet—more of a low, steady growl than a squeal—so operators feel the bit tracking cleanly down the bore. On retrieval, edges show a satin burnish rather than spalled flats, a small, tactile proof of balanced loading and uniform wear.
In foundation piling, a stalled tool costs more than minutes—it compounds crane time, concrete schedules, and inspection windows. This 8 1/2" bit is built to guard against those hidden costs. Gauge hardfacing at the shirttail shields the seal zone; extra inserts maintain full diameter through abrasive runs, which means cages drop easier and tremie work proceeds without wrestling a tight hole. The result: predictable penetration, fewer tool changes, and piles that pass caliper checks the first time.
| Item | Spec |
|---|---|
| Size | 8 1/2" (215.9 mm) |
| IADC Code | 637 |
| Bearing | Journal bearing |
| Sealing | O-ring |
| Cutting Structure | Conical |
| Rows / Qty | 7 / 52 inserts |
| Shirttail / Lug | Welding carbide + additional inserts |
| Packaging | Wood box; fumigation tray optional |
| Delivery | ≤1 week if in stock; otherwise depends on quantity |
| Transportation | Sea or air |
IADC 637 geometry + conical inserts deliver high ROP in hard/abrasive formations while minimizing cone shell erosion.
7×52 layout balances cutting load to reduce localized overheating and tooth breakage.
Journal bearing with O-ring sealing maintains film strength under high WOB and RPM.
Grease pathways are optimized for steady lubrication; options for vacuum oil fill and high-temp seals available on request.
Welded carbide on shirttail + added gauge inserts defend OD and the seal area, extending bit life and preserving hole quality.
Cleaner gauge equals easier cage placement and better grout/concrete coverage.
8 1/2" interface for core barrel and foundation applications; fits typical rotary rigs and site workflows.
Wood-case packaging, short lead time (stock-dependent), sea/air logistics.
Formation & IADC matching (hard rock; typical 100–180 MPa envelopes with 637/537 families).
Bearing/seal scheme (journal or rolling; O-ring or metal face; optional vacuum oil fill & grease compensation).
Cutting structure (conical/chisel inserts; rows/teeth count; gauge & heel protection; shirttail hardfacing).
Size/compatibility (8 1/2" primary; core barrel, HDD, and rotary piling compatibility; connection/bolt patterns if applicable).
Materials & treatments (cone/arm alloy steels; hardfacing; surface plating where specified).
Applications (bored piles, rock socket, HDD crossings, coring shelves, civil/infra).
Delivery & assurance (API/ISO references where applicable, MOQ, packaging, lead time).
Maintenance & longevity (sealing temperature rating, lubrication strategy, recommended WOB/RPM windows on request).
Proven hard-rock pedigree：Our single cone program mirrors best practices seen in heavy foundation and HDD tooling—journal bearings, conical compacts, and aggressive gauge protection—to keep ROP high without sacrificing hole roundness.
Predictable logistics：Standard wood-case packing with optional fumigated pallets; in-stock SKUs dispatch within a week, reducing project float.
Engineer-to-order support：We can tune insert count/geometry, hardfacing coverage, and seal spec to your geology and rig parameters, aligning with your ROP and cost per meter targets.
Quality you can audit：Material traceability and dimensional checks on incoming and finished goods; seal and bearing integrity verified per batch; inspection reports available with shipment.
Value Outcome：Fewer change-outs per pile, cleaner diameters for faster reinforcement placement, and consistent ROP—resulting in lower total cost per installed meter.
Hard, abrasive formations where conical inserts excel—typical uniaxial compressive strengths in the ~100–180 MPa range, with stable performance in fractured intervals.
Yes. We can adjust row count, exposure height, gauge rows, and hardfacing to match target ROP, bit life, and your rig’s WOB/RPM envelope.
Standard O-ring with high-quality grease performs in most piling sites; high-temperature seals and vacuum oil filling are available for heat-intensive runs or extended dwell applications.
The 8 1/2" format is designed for mainstream foundation core barrels and rotary rigs. Share your connection/drive details for fit-up confirmation.
Stock units can ship within a week. For customized configurations, lead time depends on spec and quantity; MOQ policies are flexible for project starts.
Welded carbide on the shirttail plus extra gauge inserts protect the seal area and maintain OD, lowering the risk of tight cages and rework.