158.7 (6 1/4) STDP215

For Water Well • HDD • Construction Drilling

STDP Tricone Drill Bits are engineered for reliable drilling performance in water well, HDD (Horizontal Directional Drilling), geotechnical, and general construction applications.

This 6 1/4" IADC 215 model is a steel-tooth tricone bit designed for soft to medium formations. Based on the provided IADC selection guides, the 215 series is suited to formations such as soft limestone, marl, gypsum, loose sands, and other soft-to-medium ground conditions.

The bit features central fluid circulation for efficient drilling-fluid delivery, helping support cuttings removal and consistent hole cleaning during operation. It is supplied with a 3 1/2" Regular (Reg) pin connection and has a 32 lb bit weight.

Key Specifications

• Bit Size: 6 1/4" (158.7 mm)
• IADC Code: 215
• Bit Type: Steel Tooth Tricone
• Fluid Circulation: Central Fluid Circulation
• Connection: 3 1/2" Reg Pin
• Weight: 32 lb

Recommended Ground & Formation Types (IADC 215)

This bit is ideal for drilling in soft to medium formations, including:

• Soft limestone
• Marl
• Gypsum
• Loose sands
• Sandy/clay ground
• Soft marl and loam
• Weak rubble
• Wet clay and shingle
• Medium coal
• Other comparable soft-to-medium formations

Applications

Suitable for:

• Water well drilling
• HDD and utility drilling
• Construction drilling
• Geotechnical drilling
• Soft formation drilling
• General rotary drilling applications

• Size
  6 1/4
• Circulation Type
  Central Fluid
• Cutting Structure
  Steel Tooth
• IADC Series
  200
• Formation Type
  Medium
• Industry
  Water Well
• API Thread Size
  Pin 3 1/2" Reg
• Bearing
  Sealed Bearing