Steadfast Anchors (SDA)



Geo Constech Steadfast Anchor (SDA) is a bolting solution for unstable ground conditions such as sand, gravel, silt, and clays, and in soft to medium fractured rock formations.

The product brings a great respite to the construction designers and workers facing the above problems.

The Self Drilling Anchor system is designed for optimized installation and can be customised as per the needs of the construction.

A SDA self-drilling anchor consists of:

  • a hexagonal nut
  • a bearing plate
  • extension couplings, if the anchor consists of several anchor rod sections
  • hollow anchor rod(s)
  • a sacrificial drill bit

Steadfast Anchors (SDA) Components

Hollow anchor rods

The anchor rod contains a hollow bore for flushing, or sim- ultaneous drilling and grouting, and has a left-hand thread for connection to standard drill tooling.

The rolling process improves the crystaline arrangement of the steel, increasing the yield strength, and producing a durable drill rod suitable for a wide range of applications. The stand- ard rope thread of the anchor rod produces an excellent bond between the rod and grout, as well as enabling connection to all Geo Constech drilling rigs and a wide range of drill steel accessories.


The coupler has a patented design that enables direct end-to- end energy transmission between each bar. The material of the coupling helps in reducing energy losses and ensuring maximum percussive energy at the drill bit.

To enable the correct seating of each bar within the coupler, all bars are chamfered with precision to enable the bar ends to have face-to-face contact.


The plates are forged steel plates with a centre hole, allowing articulation of seven degrees in all directions. All functional parts are constantly tested, in line with Geo Con-stech’s rig- orous quality assurance policy.

Hexagonal nuts

The hexagonal nuts are produced from high precision steel with chamfered edges on both ends. The quality assures to meet the stringent demands on anchor specifications and the daily operations of underground work. All nuts exceed the ultimate strength of the bar.

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