Steel Drill Bit (For Loose Starter) Self Drilling Anchor (SDA)
HARDENED STEEL SACRIFICIAL DRILL BIT - FOR LOOSE STARTER GROUND

Steel Drill Bit (For Loose Starter)

The Hardened Steel Sacrificial Drill Bit is an economical, high-efficiency cutting tool engineered specifically for initiating collar holes and drilling through soft, loose, or cohesive starter overburden formations such as silt, loose sand, soft clay, and weathered gravel. Designed to thread directly onto Self Drilling Anchor (SDA) hollow bars, this all-steel bit features high-flow fluid ports to enable aggressive mud or water flushing while stabilizing collapsible ground in the critical initial meters of drilling.

Loose Starter Ground Optimization
Engineered for rapid collar penetration in soft overburden, clay, loose gravel, and backfill formations.
Cost-Effective Sacrificial Design
High-yield all-steel construction provides an economical solution where tungsten carbide is not required.
High-Velocity Annular Flushing
Enlarged central and peripheral flush ports prevent clay clogging and cuttings accumulation during drilling.
ISO 10208 Direct Threading
Direct thread mounting to R25, R32, R38, and R51 hollow bars without special adapters.
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

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

Steel Drill Bit (For Loose Starter) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
Bit Type
Hardened Steel Sacrificial Starter Bit (Cross / Stepped Clay Profile)
02
Compatible Bar Series
R25, R32, R38, R51 Rope Threads (ISO 10208 Standard)
03
Available Diameters
42 mm (R25), 51 mm / 64 mm / 76 mm (R32), 76 mm / 90 mm (R38), 90 mm / 110 mm (R51)
04
Material Grade
Heat-Treated High-Strength Structural Alloy Steel
05
Body Hardness
45–50 HRC Through-Hardened Cutting Edges
06
Thread Direction
Left-Hand (LH) Standard; Right-Hand (RH) Available
07
Target Geotechnical Strata
Loose sand, soft clay, alluvial deposits, fill materials, weathered soil
08
Operating Technique
Simultaneous rotary-percussive drilling with water/air flushing and subsequent pressure grouting
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Verified Technical Reference

Steel Drill Bits for Overburden Starter Applications

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In geotechnical installations, the first 1 to 3 meters frequently consist of uncompacted topsoil, fill, or loose gravel where hard rock carbide buttons are unnecessary and prone to excessive wear from loose abrasive sands. The Sigricare all-steel starter drill bit provides sharp, aggressive shearing action in soft strata, ensuring accurate collar positioning and smooth advancement before encountering hard rock horizons.

Hardened Steel Starter Bit Sizing & Engineering Matrix

Bar Profile Thread Standard Available Diameters Flushing Ports Approx. Wt (kg) Ideal Formation
R25N ISO 10208 (R25) 42 mm 2-Port Central 0.28 kg Soft clay, sand, loose silt
R32 ISO 10208 (R32) 51 mm, 64 mm, 76 mm 3-Port Peripheral 0.35 – 0.65 kg Loose overburden, alluvial gravel
R38 ISO 10208 (R38) 76 mm, 90 mm 3-Port High-Flow 1.10 – 1.60 kg Dense gravel, colluvium, clay fill
R51 ISO 10208 (R51) 90 mm, 110 mm 4-Port High-Flow 1.80 – 2.30 kg Cohesive mud, deep overburden fill
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