IADC 517 / 537 Series TCI Tricone Bits

IADC Classification: IADC 517 / IADC 537
Cutter Type: Tungsten Carbide Inserts (TCI)
Featured Sizes: 8-1/2", 8-3/4", 12-1/4", 17-1/2" (Full range from 5-7/8" to 17-1/2" available)
Thread Connection: Standard API Regular Pin (Box options available)
Bearing Structure: Sealed Roller Bearing (517) / Sealed Journal Bearing (537)
Formation Suitability: Soft to Medium-Hard Formations with Low Compressive Strength

IADC 517 / 537 Series TCI Tricone Bits: High-Production Soft-Medium Strata Drilling

Efficient deep-hole penetration relies heavily on selecting a cutting structure matched perfectly to the formation's compressive strength. Bloom Machinery’s IADC 517 and IADC 537 TCI (Tungsten Carbide Insert) Tricone Bits are engineered specifically for drilling through soft to medium-hard strata, including shale, limestone, sandstones, and dolomite.

Featuring premium chisel and conical shaped tungsten carbide rows, these series maximize cutting efficiency through aggressive shearing and crushing actions. The IADC 517 configuration utilizes high-precision sealed roller bearings, making it an excellent economic benchmark for standard infrastructure piling and mid-depth water wells. For deeper runs and higher weight-on-bit requirements, the IADC 537 variant upgrades the assembly to heavy-duty sealed journal bearings paired with extra tungsten carbide gauge protection inserts. Fully compatible with universal API regular drill strings, our 5-series tricone lineup guarantees reliable downhole hours and consistent borehole verticality.

Bit Size (Inch)	Bit Size (mm)	Available IADC	API Standard Pin Connection	Configuration & Gauge Feature
5-7/8"	149.2 mm	IADC 517 / 537	3-1/2" API Regular	Slimhole design, compact cutting structure for pilot holes.
8-1/2" ★ Hot	215.9 mm	IADC 517 / 537	4-1/2" API Regular	Universal production size; premium sealed bearing geometry.
8-3/4" ★ Hot	222.2 mm	IADC 517 / 537	4-1/2" API Regular	Extended mainbore option; robust inner and outer row inserts.
12-1/4" ★ Hot	311.1 mm	IADC 517 / 537	6-5/8" API Regular	High-volume intermediate hole drilling; reinforced shirtail protection.
14-3/4"	374.6 mm	IADC 517 / 537	7-5/8" API Regular	Large diameter surface boring; multi-row carbide arrangements.
17-1/2" ★ Hot	444.5 mm	IADC 517 / 537	7-5/8" API Regular	Heavy-duty top-hole opening; maximized fluid flushing layout.