top of page


The MIDAS Hollow bar is a fully threaded self-drilling anchorage system which can be simultaneously drilled and grouted into loose or collapsing soils and brittle rock without the need for a casing. MIDAS Self Drilling Anchor System provide superior and cost effective bolting solution for unstable ground conditions such as sand, gravel, silt, and clays and in fractured rock formations. The self drilling anchor is optimized and tailored to the projects needs. Lean manufacturing methods are adopted to keep the lead times low and deliveries reliable. The production process is closely monitored and quality is controlled at every stage of the manufacturing process.

The self drilling anchor bolt works with drilling a hole in cohesive and non-cohesive

soil or loose rock, with a sacrificial drill bit and a hollow rod. A resin is injected at high pressure into the hollow and cavity which reinforces the surrounding area, later the hollow rod is locked with a retaining plate.

A Self-Drilling Anchor Consists of:

Hollow Anchor Rod

Drill Bit


Extension Couplings

Bearing Plate

Hexagonal Nut

hower image.jpg
model sda 2.png

Hollow Anchor Rods

The anchor rod has a hollow bore for flushing and grouting and has a left-hand thread for connection to standard drill tooling. It is manufactured from High-Grade steel tubing to

EN 10083-1/Equivalent, cold-rolled to a standard ISO rope thread profile. The rolling process refines the crystalline structure of the steel, increasing the yield strength and

producing a durable drill rod suitable for a wide range of applications. The standard rope thread of the anchor rod produces an excellent bond between the rod and grout.

The coupling enables direct end-to-end energy transmission between each bar, reducing 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.

Extra corrosion protection over the full nail length if the full nail length is in fill material or where corrosion potential is higher. The galvanizing of all MIDAS Drill hollow bars is

in accordance with EN 1461 / ASMT A-153.

Extension Couplings

Galvanised System

Table for Website.jpg

Galvanized Self Drilling Anchor System

bottom of page