For Oil & Gas • Water Well • HDD • Geothermal • Construction Drilling

The Viper Pro 5 1/2" (139.7 mm) VPR537K Tricone Drill Bit is engineered for demanding drilling applications where reliable penetration, bearing performance, and gauge protection are critical.

The IADC 537 classification combines a TCI cutting structure with a sealed journal bearing and gauge protection, making this bit well suited for drilling through medium to harder, abrasive and consolidated formations encountered in oil and gas, water well, geothermal, HDD, and construction drilling.

The Viper Pro design provides an optimized tungsten carbide insert cutting structure for efficient rock fragmentation while the sealed journal bearing system supports smooth cone rotation and reliable performance under sustained drilling loads. Gauge protection helps maintain the bit's outside diameter and contributes to longer bit life in abrasive formations.

Based on the IADC 537 ground-condition classification, this bit is particularly suited for formations such as gabbro, amphibole, granite-diorite, granite, diorite, fine-grained sandstone, and other consolidated igneous and abrasive formations. The reference guide places these formations in the approximate 65–93 MPa (9–13.5 ksi) compressive-strength range.

The VPR537K is a versatile choice for drilling contractors and energy-sector operators looking for a dependable tricone bit for challenging ground conditions, including oil and gas drilling, where consistent cutting performance and bearing durability are essential.

Recommended Ground & Formation Types (IADC 537)

This bit is well suited for:

• Amphibole
• Gabbro
• Granite-diorite
• Fine-grained granite
• Diorite
• Fine-grained sandstone
• Conglomerated igneous pebble formations
• Alkaline dike rock
• Oxidized ferruginous formations
• Consolidated and abrasive rock
• Medium to harder formations with compressive strengths approximately 65–93 MPa (9–13.5 ksi)

Typical Applications

• Oil & Gas Drilling
• Water Well Drilling
• HDD / Utility Drilling
• Geothermal Drilling
• Construction Drilling
• Geotechnical Drilling
• Rotary Rock Drilling