T76 Bit (Heavy-Duty Foundation & Tunneling Drill Bit) Self Drilling Anchor (SDA)
T76 HEAVY-DUTY FOUNDATION & TUNNELING DRILL BIT

T76 Bit (Heavy-Duty Foundation & Tunneling Drill Bit)

The T76 Bit is a large-diameter sacrificial rotary-percussive drill bit engineered specifically for heavy geotechnical ground reinforcement with T76N and T76S Self Drilling Anchor hollow bars. Designed for maximum load transmission under high-energy hydraulic drifters, the T76 bit utilizes reinforced carbide gauge buttons and heavy-duty alloy steel body construction to drill through boulders, hard bedrock, and mixed overburden in tunneling umbrella arches, deep foundation micropiles, and high retaining wall anchors.

Heavy Foundation & Underpinning
Optimized for high-yield T76 anchor bars delivering up to 1900 kN ultimate load capacity.
Standard Diameters: 115mm & 120mm
Precision sized at 115 mm and 120 mm (with 130 mm available) for adequate borehole-to-bar grout clearance.
Heavy-Gauge Carbide Layout
Multi-row spherical tungsten carbide buttons withstand extreme percussive shock and high rotary torque.
High-Capacity Flushing Channels
Quad-port high-volume flushing nozzles prevent bit blinding during aggressive single-pass grout injection.
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

Certified engineering tolerances, metallurgical grades, and load metrics for heavy geotechnical installations.

T76 Bit (Heavy-Duty Foundation & Tunneling Drill Bit) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Bit Designation
T76 Heavy-Duty Sacrificial Rock Drill Bit
02
Bar System Compatibility
T76N (76mm OD / 51mm ID) and T76S (76mm OD / 47mm ID) Hollow Anchor Bars
03
Thread Standard
T76 Trapezoidal Thread (ISO 10208 / EN 14199 Standard)
04
Available Diameters
115 mm, 120 mm (Optional: 130 mm)
05
Cutting Inserts
Heavy-Duty Tungsten Carbide (TC) Spherical / Ballistic Buttons (87–89 HRA)
06
Bit Body Material & Hardness
High-Grade Quenched & Tempered Micro-Alloy Steel | 50–55 HRC Body Hardness
07
Approximate Unit Weight
3.20 kg to 3.80 kg
08
Target Geotechnical Applications
Tunnel Crown Forepoling, Deep Structural Micropiles, Dam Anchoring, Highway Slope Piles
09
Drilling Dynamic
High-impact rotary-percussive drilling with simultaneous air, water, and cement grout flush
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Verified Technical Reference

T76 Large Diameter Bit Engineering & Annular Grouting Ratio

View Catalog PDF
When installing 76 mm hollow anchor bars, borehole diameter and grout annular clearance are paramount. A 115 mm or 120 mm T76 bit creates a minimum 19.5 mm to 22 mm radial annulus around the bar, guaranteeing complete cement grout encapsulation and preventing premature refusal in fractured boulder strata under heavy hydraulic rigs.

T76 Heavy-Duty Drill Bit Technical Specifications

Bit Model Bit OD (mm) Matching Bar Bar OD / ID Carbide Buttons Unit Weight Borehole Annulus
T76 / 115 115 mm T76N / T76S 76 mm / 51 mm or 47 mm 10x Heavy TC Buttons 3.40 kg 19.5 mm Radial Grout Clearance
T76 / 120 120 mm T76N / T76S 76 mm / 51 mm or 47 mm 12x Heavy TC Buttons 3.75 kg 22.0 mm Radial Grout Clearance
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