R38 Hollow Steel Bar

R38 hollow steel bar can be installed in sites with weak rocks, loose soil, weathered layer, sand with stone layer and so difficult to create a hole in complex formation.It features a hollow bore for flushing, or simultaneous drilling and grouting. The accessories include the anchor coupling, anchor nut, anchor plate and drill bit adapter. It can be elongated by using couplers.


R38 hollow steel bar

Size Outer Dia. (mm) Inner Dia. (mm) Ultimate Load (KN) Yield Load (KN) Weight (Kg/m) Thread
R38N/1 38 23 500 400 4.8 ISO10208
R38N/2 38 21 500 400 5.5 ISO10208
R38N 38 19 500 400 6.0 ISO10208
R38S/1 38 18 500 430 6.2 ISO10208


Anchor Coupling

Size Outer Dia. (mm) Length (mm) Weight (Kg) Thread
R38 51 180 1.35 ISO10208
R38 51 200 1.5 ISO10208
R38 51 220 1.70 ISO10208

Anchor Nut

Size Type Key Size (mm) Length (mm) Weight (Kg)
R38 Hex Nut 50 50 0.39
R38 Hex Nut 50 60 0.47
R38 Domed Nut 52 60 0.70

Anchor Plate

Size Type Dimensions (mm) Thickness (mm) Hole Dia. (mm) Weight (Kg)
R38 Domed Plate 200*200 12 41 3.60
R38 Domed Plate 150*150 8 41 1.38
R38 Plat Plate 140*140 35 41 5.00
R38 Plat Plate 200*200 12 41 3.60

Drill Bit Adapter

Size Drill Bit Length (mm) Weight (Kg)
R38 51 68 0.41


Size Outer Dia. (mm) Length (mm) Weight (Kg)
R38 78 30 0.30

Drill Bits

Type Size Diameter (mm)
EX R38 ø76, ø90, ø100
EXX R38 ø76, ø90
ES-F R38 ø76, ø90
ESS-F R38 ø90, ø115
Clay Bit R38 ø90, ø100, ø110, ø130, ø150
EY R38 ø76
EYY R38 ø76, ø90
XX R38 ø110, ø130


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R38 hollow steel bar is especially designed for many complex soil conditions,such as weak rocks, loose soil, weathered layer and sand with stone layer. Compared to the traditional method, the unconsolidated ground condition is more appropriate and effective to install the R38 self drilling hollow bar.For simultaneously drilling and injecting, it is usually performed in cases where the ground needs to be further improved or stabilized during installation.

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