All Drill Bits (R25, R32, R38, R51, T76 Complete Series) Self Drilling Anchor (SDA)
COMPLETE SDA ROCK DRILL BITS SERIES (R25 – T76)

All Drill Bits (R25, R32, R38, R51, T76 Complete Series)

The Complete SDA Rock Drill Bits Series is a comprehensive, multi-profile portfolio of sacrificial rotary-percussive rock drill bits engineered for Self Drilling Anchor hollow bars across all industry standards: R25, R32, R38, R51, and T76 (ISO 10208 / EN 14199). Precision manufactured with high-durability alloy steel bodies and premium sintered tungsten carbide inserts, this complete range accommodates every geological condition from soft clay, gravel, and weathered shale to massive basalt and hard abrasive granite.

Full Profile Coverage
Direct thread compatibility for R25, R32, R38, R51, and T76 hollow anchor bars without adapters.
Multiple Cutting Structures
Cross Bits (EX/EXX), Spherical Button Bits (ESF/ESSF), and Stepped Clay Bits engineered for distinct geologies.
Wear-Resistant Tungsten Carbide
Premium 87–89 HRA tungsten carbide inserts delivering maximum penetration rates in abrasive rock formations.
High-Velocity Flushing Nozzles
Multi-aperture central and peripheral flushing ports prevent bit blinding during simultaneous air/water/grout injection.
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

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

All Drill Bits (R25, R32, R38, R51, T76 Complete Series) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Supported Thread Profiles
R25, R32, R38, R51, T76 Rope & Trapezoidal Threads (ISO 10208)
02
Available Bit Diameters
42 mm, 51 mm, 76 mm, 90 mm, 110 mm, 115 mm, 130 mm
03
Cutting Configurations
Cross Bit (EX/EXX), Button Bit (ESF/ESSF), Clay/Chisel Stepped Bit
04
Bit Body Material & Hardness
Heat-Treated Alloy Steel | 50–55 HRC Body Hardness
05
Carbide Grade & Hardness
Sintered Tungsten Carbide (TC) | 87–89 HRA Hardness
06
Flushing Apertures
Multi-channel high-velocity central and peripheral flush nozzles
07
Thread Direction
Standard Left-Hand (LH) or Right-Hand (RH) Available
08
Bar System Compatibility
R25N, R32L, R32N, R32S, R38N, R51L, R51N, T76N, T76S Hollow Bars
09
Unit Weight Range
0.30 kg (R25/42mm) to 3.80 kg (T76/130mm)
10
Geological Suitability
Soil, silt, sand, gravel, weathered shale, boulders, limestone, and hard granite
11
Quality Certification
ISO 9001:2015 QA | Batch Certified Ultrasonic Non-Destructive Testing
12
Operating Dynamic
Sacrificial rotary-percussive drilling with simultaneous high-pressure grouting
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
Request Mill Test Certificate (MTC)
 
Verified Technical Reference

Comprehensive SDA Rock Drill Bits Application & Selection Guide

View Catalog PDF
Selecting the correct sacrificial drill bit is crucial for optimizing penetration velocity, preventing borehole deviation, and guaranteeing effective annular grout distribution. For cohesive soils and clay, Stepped Clay bits provide smooth rotation. In fractured and weathered rock, Hardened Steel Cross Bits (EX) and Button Bits (ESF) deliver exceptional cost efficiency. For high-wear abrasive granite, basalt, and river gravel boulders, Tungsten Carbide Button Bits (ESSF) and TC Cross Bits (EXX) offer maximum impact resilience and maintain gauge throughout deep drilling depths.

Complete SDA Drill Bits Engineering Selection Matrix (R25 – T76)

Thread Profile Bit Cutting Type Available Diameters Approx. Unit Wt Cutting Inserts Target Geological Formations
R25N Cross (EX/EXX) / Button (ESF/ESSF) 42 mm, 51 mm 0.30 – 0.40 kg Hardened Steel / TC Spherical Soft clay, sand, loose gravel, weathered rock
R32L / R32N / R32S Cross (EX/EXX) / Button (ESF/ESSF) 42 mm, 51 mm, 76 mm 0.30 – 0.85 kg Carbide Cross / 4–6 TC Buttons Dense gravel, slate, fractured limestone, shale
R38N Heavy-Duty Button / TC Cross 76 mm, 90 mm, 110 mm 1.40 – 2.40 kg 6–8 Ballistic/Spherical TC Buttons Hard granite, basalt, gneiss, river boulder fills
R51L / R51N Multi-Button / High-Abrasion TC 90 mm, 110 mm, 115 mm 2.10 – 2.80 kg 8–10 Premium Sintered TC Buttons High-strength bedrock, heavy tiebacks, foundation micropiles
T76N / T76S Heavy Foundation Button Bit 115 mm, 130 mm 3.20 – 3.80 kg Large-gauge Heavy TC Buttons Deep structural micropiles, heavy underpinning, high overburden
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