Carbide Drill Bit (R25, R32, R38, R51, T76) Self Drilling Anchor (SDA)
TUNGSTEN CARBIDE ROCK DRILL BITS — R25 TO T76 COMPLETE SERIES

Carbide Drill Bit (R25, R32, R38, R51, T76)

The Sigricare Carbide Drill Bit series features premium sintered Tungsten Carbide (TC) spherical and ballistic button inserts precision-brazed into heavy-duty heat-treated alloy steel bit bodies. Engineered specifically for rotary-percussive drilling in medium-to-hard rock, abrasive granite, sandstone, basalt, limestone, and boulder-rich overburden. Available in comprehensive sizing: R25 (42mm), R32 (51mm, 64mm, 76mm), R38 (76mm, 90mm), R51 (90mm, 110mm), and T76 (115mm, 120mm) to match the complete range of Self Drilling Anchor hollow bars.

Sintered Tungsten Carbide Inserts
Premium 87–89 HRA hardness buttons resist abrasive wear and maintain hole gauge over deep drilling depths.
Complete Sizing Spectrum
Precision engineered for R25 (42mm), R32 (51/64/76mm), R38 (76/90mm), R51 (90/110mm), and T76 (115/120mm).
Impact-Toughened Steel Body
Heat-treated micro-alloy steel body (50–55 HRC) withstands extreme percussive shock without shearing.
Dual Flushing Ports
Optimized central and peripheral flushing orifices ensure immediate evacuation of heavy rock cuttings.
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

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

Carbide Drill Bit (R25, R32, R38, R51, T76) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Cutting Structure
Spherical & Ballistic Tungsten Carbide (TC) Buttons (ESF / ESSF Profile)
02
Carbide Hardness
87–89 HRA Sintered Tungsten Carbide Grade
03
Bit Body Material & Hardness
Special Micro-Alloy Steel | 50–55 HRC Through-Hardened
04
R25 Size (Diameter)
42 mm
05
R32 Sizes (Diameters)
51 mm, 64 mm, 76 mm
06
R38 Sizes (Diameters)
76 mm, 90 mm
07
R51 Sizes (Diameters)
90 mm, 110 mm
08
T76 Sizes (Diameters)
115 mm, 120 mm
09
Thread Profiles
ISO 10208 Continuous Rope & Trapezoidal Threads (R25, R32, R38, R51, T76)
10
Geological Applications
Medium-to-hard rock, granite, sandstone, basalt, river boulders, limestone, fractured formations
11
Drilling Dynamic
Sacrificial rotary-percussive drilling with simultaneous high-pressure water/cement grout flushing
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Verified Technical Reference

Tungsten Carbide Button Matrix for Abrasive Formations

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In hard and abrasive ground, standard steel bits rapidly lose gauge and round off, causing borehole deviation and premature drill string seizure. Sigricare Carbide Drill Bits utilize sintered cobalt-bonded tungsten carbide spherical buttons strategically positioned on the face and gauge rows. This configuration maintains constant borehole diameter throughout the anchor length, ensuring the required grout annulus for maximum rock-anchor bond strength.

Tungsten Carbide Button Bits Full Sizing Matrix (R25 – T76)

Thread Profile Available Diameters (mm) Carbide Button Configuration Approx. Wt (kg) Recommended Formations
R25 42 mm 4x Spherical TC Buttons 0.35 kg Sandstone, slate, shale, gravel
R32 51 mm, 64 mm, 76 mm 5–6 Spherical TC Buttons 0.45 – 0.90 kg Limestone, dolomite, sandstone, shale
R38 76 mm, 90 mm 6–8 Ballistic TC Buttons 1.40 – 2.10 kg Granite, basalt, gneiss, river boulders
R51 90 mm, 110 mm 8–10 Ballistic TC Buttons 2.20 – 2.90 kg Hard abrasive rock, deep tieback piles
T76 115 mm, 120 mm 10–12 Large-Gauge TC Buttons 3.20 – 3.60 kg Heavy structural micropiles, massive rock
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