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Anchor Drill Bits

Drill Bits Selection

Code	Description
EX	Hardened cross bit for loose to medium dense ground conditions
EXX	TC cross bit for soft to medium rock formations
ES	Hardened button bit for unconsolidated rock with boulders
ESS	Button bit with TC inserts for medium rock formations
EC	Hardened arch bit for unconsolidated soil with small boulders
ECC	TC arch bit for soft to medium rock formations
EY	Hardened 3 cutters bit for loose to medium dense ground conditions
EYY	TC 3 cutters bit for soft to medium rock formations
EW	Casting clay bit with optimized geometry for very soft to soft caly

General guide for anchor bits diameters selection (for reference only) in self drilling anchor system

Thread	Bits Diameter (mm)
R25	ø42, ø51
R32	ø51, ø76, ø90
R38	ø76, ø90, ø100, ø110, ø115, ø130
R51	ø76, ø90, ø100, ø110, ø115, ø130, ø150
T30	ø42, ø51, ø76, ø90
T40	ø76, ø90, ø110, ø115
T52	ø76, ø90, ø110, ø115, ø130, ø150
T73	ø130, ø150, ø160, ø180, ø200
T76	ø130, ø150, ø160, ø180, ø200
T103	ø150, ø160, ø180, ø200, ø220,

Anchor Plates

Anchor Plates Specifications

Rock Bolt Type	Dimensions	Thickness	Hole Diameter	Weight
R25	150*150 mm	8 mm	30 mm	1.4 Kg
R32L	150*150 mm	8 mm	35 mm	1.3 Kg
R32N	200*200 mm	10 mm	35 mm	3.0 Kg
R32S	200*200 mm	12 mm	35 mm	3.7 Kg
R38	200*200 mm	12 mm	41 mm	3.6 Kg
R51L	200*200 mm	20 mm	60 mm	8.8 Kg
R51N	200*250 mm	40 mm	80 mm	18.5 Kg

Rock Bolt Type	Dimensions	Thickness	Hole Diameter	Weight
T30	150*150 mm	8 mm	40 mm	1.3 Kg
T40	200*200 mm	12 mm	56 mm	3.5 Kg
T52	200*200 mm	30 mm	65 mm	8.5 Kg
T73	250*250 mm	40 mm	80 mm	18.0 Kg
T76	250*250 mm	40 mm	80 mm	18.0 Kg
T103	300*300 mm	50 mm	110 mm	32.0 Kg

Anchor Nuts

Anchor Nuts Specifications

Rock Bolt Type	Key Size	Length	Hardness	Weight
R25	41 mm	35 mm	HRC 25-30	0.25 Kg
R32N	46 mm	45 mm	HRC 25-30	0.35 Kg
R32S	46 mm	65 mm	HRC 25-30	0.55 Kg
R38	50 mm	55 mm	HRC 25-30	0.50 Kg
R51	75 mm	70 mm	HRC 25-30	1.55 Kg

Rock Bolt Type	Key Size	Length	Hardness	Weight
T30	46 mm	35 mm	HRC 25-30	0.36 Kg
T40	65 mm	50 mm	HRC 25-30	0.85 Kg
T52	80 mm	70 mm	HRC 25-30	2.35 Kg
T73	100 mm	70 mm	HRC 25-30	2.45 Kg
T76	100 mm	80 mm	HRC 25-30	2.70 Kg
T103	125 mm	120 mm	HRC 25-30	5.15 Kg

Anchor Couplings

Anchor Couplings Specifications

Rock Bolt Type	Diameter	Length	Hardness	Weight
R25	35 mm	120 mm	HRC 25-30	0.45 Kg
R32L	42 mm	145 mm	HRC 25-30	0.75 Kg
R32N	42 mm	160 mm	HRC 25-30	0.80 Kg
R32S	42 mm	190 mm	HRC 25-30	0.95 Kg
R38	52 mm	220 mm	HRC 25-30	1.85 Kg
R51L	63 mm	140 mm	HRC 25-30	1.30 Kg
R51N	63 mm	200 mm	HRC 25-30	1.90 Kg

Rock Bolt Type	Outside Diameter	Length	Hardness	Weight
T30	38 mm	105 mm	HRC 25-30	0.45 Kg
T40	54 mm	140 mm	HRC 25-30	1.20 Kg
T52	70 mm	160 mm	HRC 25-30	2.30 Kg
T73	95 mm	220 mm	HRC 25-30	5.10 Kg
T76N	95 mm	200 mm	HRC 25-30	4.30 Kg
T76S	97 mm	220 mm	HRC 25-30	5.40 Kg
T103	133 mm	240 mm	HRC 25-30	11.20 Kg

Surface Treatment

Drill bit

Painting

Nut, plate & coupling

Anti-rusty Oil
Painting
Hot dip galvanizing (HDG)
Epoxy
HDG + Epoxy

For more information about our self drilling anchor equipment:

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ONTON's Advanced Self Drilling Anchor System: Tailored Stability Solutions

Self-drilling anchor system

A self drilling anchor system offers a robust solution for precarious ground conditions such as sand, gravel, silt, clays, and soft to medium fractured rock formations. At ONTON, our self-drilling anchor solutions are meticulously crafted to optimize installation, tailored precisely to the unique requirements of each project.

Self-drilling anchors

These anchors redefine conventional bolting methods by utilizing a streamlined technique. With a sacrificial drill bit and a hollow rod, they penetrate collapsing soil or loose rock. Post-drilling, cementitious grout or resin is injected into the hollow rod and surrounding cavity, elevating self-drilling anchors to a pinnacle of productivity.

Comprising elements

Comprising elements like a hexagonal nut, bearing plate, extension couplings (if involving multiple anchor rod sections), hollow anchor rod(s), and a sacrificial drill bit, our self-drilling anchor bolts guarantee structural integrity and stability in challenging environments.

The applications of ONTON’s self drilling anchor system span across critical sectors:

Slope Stabilization
Unstable rock and soil formations find stability through our self-drilling anchors. The technique’s efficiency in unconsolidated or weathered ground conditions surpasses traditional methods, ensuring swift and uncomplicated installation.
Foundations with Micropiles
Our SDA micropiles, crafted as drilled piles with injected grout and steel reinforcement via anchor rods, suit limited-space sites. Capable of installation in diverse ground conditions, including rock, they accommodate tension and compression loads efficiently, enabling high piling outputs.
Tunneling
For tunnel excavation in overburdened and soft fractured rock conditions, ONTON’s self-drilling anchor system emerge as the most economical solution. They reinforce the tunnel circumference and provide advanced roof support, ensuring safety and stability.

SDA Anchor Components

Hollow Anchor Rods:

Engineered with a hollow bore for flushing or simultaneous drilling and grouting, our anchor rods boast a durable construction suitable for various applications. Protection against corrosion is offered across our entire range of SDA bars and accessories.

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Extension Couplings

Extension Couplings:

Featuring a patented design ensuring maximum percussive energy transmission between bars, these couplings minimize energy losses, guaranteeing optimal drilling efficiency.

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