Product Description
The 5" IADC 537 TCI tricone bit (127mm) is the minimum practical roller cone size for well drilling applications where 4" steel casing requires a 127mm borehole. Below this diameter, PDC drag bits or DTH hammers typically offer better economics because roller cone geometry requires minimum cone diameter for adequate TCI insert spacing — the 5" bit sits at the design limit where insert count per cone drops to 8-10, making insert pattern optimization critical for acceptable bit life.
Cutting structure: tungsten carbide inserts sized at 7-8mm diameter, positioned in a dual-row stagger pattern across each cone. At 127mm hole size, the reduced cone diameter means each insert covers a proportionally larger arc of the formation face per revolution compared to larger bit sizes — insert wear rate is therefore higher, and tungsten carbide grade selection (medium grain, cobalt content 10-12%) is specified for wear resistance rather than impact toughness.
Bearing design: sealed roller bearing with O-ring seal. The compact 127mm bit body constrains bearing size; the roller configuration maximizes load-carrying surface area within this constraint. O-ring seals provide adequate performance in the shallow depths (under 250m) and moderate temperatures typical of small water well and geotechnical applications where this bit size is most commonly used.
For more information, see: DTH drill bits for small diameter rock drilling
Hydraulics: 2 nozzle ports at 8mm diameter. Single-pump portable rigs delivering 10-20 L/min produce adequate jet velocity through 8mm nozzles to clean the 127mm borehole bottom. Reducing nozzle count to 2 from the standard 3 maintains pressure drop at lower flow rates — critical for small rigs where pump output is the primary hydraulic constraint.
Primary applications: small-diameter domestic water supply wells where 4" casing installation requires 127mm borehole, geotechnical investigation holes for soil and rock classification, and slim blast holes in underground mining where restricted access limits drill string diameter. The bit also suits agricultural monitoring well construction where 4" screens are the standard completion. Thread: 2-7/8" API Regular Pin.
Operating parameters: WOB 2-4 t/bit, RPM 100-180. Portable rig WOB capability — typically 2-3 t maximum on the smallest machines — fits within the lower end of this range. Maintain RPM above 120 when formation strength exceeds 100 MPa; at lower RPM with high WOB, the small-diameter cones are prone to flat-bottom wear where a cone stops rotating and slides instead, destroying the cutting structure within minutes.
- Related product: 5-7/8" IADC 537 Tricone Bit For Well Drilling
Factory sales 5inch IADC 537 Tricone Drill Bit Rock Roller Bit Tungsten Carbide Insert Drill Bit
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