R51 Hollow Threaded Bar

R51 hollow threaded bar is unique anchoring system and fulfills current and increasing demands of the tunneling industry and ground engineering for safer and faster production. It’s mainly used in the mineral exploration, tunneling and slope stabilization project. A high rate of installation since drilling, placing and grouting can be performed in one single operation. The accessories include the anchor coupling, anchor nut, anchor plate and drill bit adapter.


R51 hollow threaded bar

Size Outer Dia. (mm) Inner Dia. (mm) Ultimate Load (KN) Yield Load (KN) Weight (Kg/m) Thread
R51L/1 51 37.5 550 450 5.6 ISO10208
R51L 51 36 550 450 7.0 ISO10208
R51N/L 51 34 800 630 7.5 ISO10208
R51N 51 32 800 630 8.5 ISO10208


Anchor Coupling

‍Outer Dia. (mm) Length (mm) Weight (Kg) Thread
‍63 140 1.32 ISO10208
63 170 1.70 ISO10208
63 200 1.90 ISO10208
63 200 2.00 ISO10208

Anchor Nut

Size Type Key Size (mm) Length (mm) Weight (Kg)
R51 Hex Nut 75 70 1.58
R51 Domed Nut 75 70 1.7

Anchor Plate

Size Type Dimensions (mm) Thickness (mm) Hole Dia. (mm) Weight (Kg)
R51L Plat Plate 150*150 40 56 6.2
R51L Plat Plate 200*200 30 60 8.72
R51N Plat Plate 180*180 45 56 10.5
R51N Plat Plate 250*250 40 60 18.90


Size Outer Dia. (mm) Length (mm) Weight (Kg)
R51 91 30 0.32

Drill Bits

Type Size Diameter (mm)
EX R51 ø100, ø110, ø115, ø130
EXX R51 ø90, ø100, ø115
ES-F R51 ø100, ø115
ESS-F R51 ø76, ø100, ø110, ø115, ø130, ø150
Clay Bit R51 ø115, ø130, ø150
ES-D R51 ø115
ESS-D R51 ø115


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R51 hollow threaded bar is an unique one of the R-thread types for it’s product’s location,safer and faster. The R51 hollow threaded bar can provides a safer and faster plan to meet the demands of the tunneling industry and ground engineering. In order to give full play to the advantages on many applications, the time of consuming will be efficiently saved in the whole anchoring process.

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