T73 hollow bar system

T73 hollow bar system is one of the T-thread self-drilling hollow injection anchor bar, combines drilling, grouting and anchoring together. It has fully threaded rod sections since continuous thread ensures that rods can be cut and coupled at any point.It ensures the anchoring effect in complex ground conditions. It’s safe, reliable and efficient.This kind of product is suitable for broken rock, loose soil and conditions which are difficult to drill holes, such as fracture zones, decayed rock, gravel, sandy gravel, backfill ground. In order to have optimal result, drill bits can be used differently according to the rock conditions.


T73 hollow bar system

Size Outer Dia. (mm) Inner Dia. (mm) Ultimate Load (KN) Yield Load (KN) Weight (Kg/m) Thread
T73/56 73 56 1194 785 10.75 R
T73/53 73 53 1160 970 14.10 R
T73/45 73 45 1630 1180 17.8 R
T73/35 73 35 1980 1355 21.2 R


Anchor Coupling

Outer Dia. (mm) Length (mm) Weight (Kg) Thread
89 225 3.72 R
89 235 3.90 R
95 245 5.70 R

Anchor Nut

Size Type Key Size (mm) Length (mm) Weight (Kg)
T73 Spherical Collar Nut 95 70 2.22

Anchor Plate

Size Type Dimensions (mm) Thickness (mm) Hole Dia. (mm) Weight (Kg)
T73-56/53 Plat Plate 175*175 34 80 6.85
T73-35/45 Plat Plate 250*250 40 80 18.00

Drill Bit Adapter

Size Drill Bit Length(mm) Weight(kg)
T73 T103 105 3.08


Size Outer Dia. (mm) Length (mm) Weight (Kg)
T73 130 65 1.08

Drill Bits

Type Size Diameter (mm)
EX T73 ø130,ø175
EXX T73 ø130
ESS-F T73 ø130
Clay Bit T73 ø200


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T73 hollow bar system is combined drilling, grouting and anchoring together,which provide an effective and convenient anchor method. It is one of our excellent T-thread self-drilling hollow injection rock bolt. Within reasonable application of T73 hollow bar system, the anchoring quality will be definitely guaranteed among various kinds of geological condition.

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