T127 self drilling hollow bars

T127 self-drilling hollow bars take surface thread-shaping technology. It is made of seamless steel pipe with thick wall. With a bit at the anchor head, it is easy to cut through various rocks. T127 self-drilling hollow bars can be elongated by using couplers. This self-drilling hollow bar embodies drilling, grouting and anchoring as a whole and can improve the condition of surrounding rock in the course of deformation due to high ground stress. It is mainly used for weathered rock, backfill, hard conglomerate and gravel layer.


T127 self drilling hollow bars

Size Outer Dia. (mm) Inner Dia. (mm) Ultimate Load (KN) Yield Load (KN) Weight (Kg/m) Thread
T127/111 127 111 2400 1810 23.5 R
T127/103 127 103 2320 2030 28.5 R


Anchor Coupling

Outer Dia. (mm) Length (mm) Weight (Kg) Thread
139 255 5.4 R

Anchor Nut

Size Type Key Size (mm) Length (mm) Weight (Kg)
T127 Spherical Collar Nut 140 140 7.6

Anchor Plate

Size Type Dimensions (mm) Thickness (mm) Hole Dia. (mm) Weight (Kg)
T127 Plat Plate 250*250 50 140 18.40


Size Outer Dia. (mm) Length (mm) Weight (Kg)
T127 200 80 3.5

Drill Bits

Type Size Diameter (mm)
EX T127 ø200
ESS-F T127 ø200
Clay Bit T127 ø200


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T127 self drilling hollow bars is comprised of a hollow threaded bar and an attached drill bit that performs drilling, anchoring and grouting in a single operation. The hollow bar allows air and water to pass freely through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling. Grout fills the hollow bar and completely covers the entire bolt.

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