Ring Bit (Symmetrix Concentric Drilling System) Pipe Proofing
CONCENTRIC DRILLING RING BIT SET

Ring Bit (Symmetrix Concentric Drilling System)

The Ring Bit Set is an integrated ring bit and casing shoe component welded directly to the front of the starter pipe in the Symmetrix concentric overburden drilling system. Connected to the central pilot bit through a precision locking mechanism, the ring bit drills the required void to advance the casing pipe simultaneously through gravel, boulders, and fractured rock.

Concentric Void Drilling
Ensures straight, high-accuracy holes without deviation
Retrievable Pilot Bit
Recovers high-value pilot bit after reaching target depth
Tungsten Carbide Buttons
Penetrates tough boulders and abrasive geology with ease
Welded Casing Shoe
Heavy-duty weld prep ensures zero structural separation
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ENGINEERING METRICS

TECHNICAL DATA & SPECIFICATIONS

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

Ring Bit (Symmetrix Concentric Drilling System) — Technical Data Sheet

Quality Assurance Standard: ISO 10208 / EN 14199

# Technical Metric Certified Specification
01
System Component
Integrated Ring Bit and Casing Shoe
02
Assembly Method
Welded to front of starter pipe (first pipe)
03
Locking Mechanism
Precision bayonet / lug interlock with central pilot bit
04
Impact Transfer
Directly from pilot bit shoulder to ring bit cutting face
05
Bit Cutting Inserts
Premium Sintered Tungsten Carbide (TC) spherical buttons
06
Hardness
87–89 HRA (Tungsten Carbide), 50–55 HRC (Alloy Steel Body)
07
Compatible Pipe Sizes
76mm, 89mm, 114mm, 140mm, 168mm
08
Reusability
Sacrificial ring bit left at borehole depth; pilot bit fully retrievable
09
Flushing Dynamic
Central and peripheral air/water flush ports for rapid cuttings removal
100% Ultrasonic flaw tested and batch certified under ISO 9001:2015 QA procedures.
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Verified Technical Reference

Symmetrix Concentric Drilling System Overview

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The Symmetrix concentric drilling system components consist of a central pilot bit that drills the center part of the hole and transfers impact energy to the ring bit, and an integrated ring bit set welded directly to the starter pipe. The ring bit, connected through a secure locking mechanism, drills the void needed to advance the casing pipe simultaneously.

Symmetrix Concentric Ring Bit System Technical Sizing

Casing Pipe OD Casing Pipe ID Ring Bit OD Ring Bit ID Pilot Bit OD Hammer Size
76.2 mm (3.0") 66.0 mm 89.0 mm 65.0 mm 74.0 mm DTH 2.5" / 3"
88.9 mm (3.5") 78.0 mm 102.0 mm 77.0 mm 86.0 mm DTH 3" / 3.5"
114.3 mm (4.5") 101.0 mm 127.0 mm 100.0 mm 110.0 mm DTH 3.5" / 4"
139.7 mm (5.5") 125.0 mm 152.0 mm 124.0 mm 135.0 mm DTH 4" / 5"
168.3 mm (6.6") 150.0 mm 185.0 mm 149.0 mm 165.0 mm DTH 5" / 6"
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