Order Enquiry

R38 Hollow Threaded Drilling Anchor Bolt

A good alternative to DYWI Hollow Drill Rods or MAI SDA. Self-drilling, injection anchoring systems for underground works.

ONTON® Hollow Bar (Self Drilling Anchor, IBO) features a wide range of applications such as soil nails, micropiles, rock bolts, or ground anchors. It is applied to self-drilling ground control solution used in Civil Engineering and underground construction.

You can see its application in Deep Foundation like micropiles, Earth Retention like soil nail walls. Self-Drilling is easy drilling than CFA (Continuous Flight Auger, or Auger Cast piles).


Civil Engineering Underground Mining and Tunneling
1. Pile foundation 1. Stabilization of tunnel portals, trenches, and cut-and-cover areas
2. Slope and embankment stabilization 2. Forepoling
3. Reinforcement of excavation pits and retaining walls 3. Face stabilization
4. Foundation of pylons and wind mills 4. Radial rock bolting
5. Anchorage of avalanche protection structures and noise barriers 5. Roof and rib bolting
6. Injection works 6. Injection works



Product Attributes

  • Matching System: DYWI/CTS Drilling Systems
  • Surface treatment: galvanized,epoxy
  • Material: Steel, S460
  • Usage: mining,tunnel,slope,foundation pit
 Typical technical performance for R38 Hollow Threaded Drilling Anchor Rock Bolt:
SDA Hollow Bar Specifications
SDA Size Outer Diameter (mm) Inner Diameter (mm) Ultimate Load (kN) Yield Load (kN) Weight (kg/m)
R38N 38 23 500 400 4.3
Other standards available on request

Now, you will think these specifications are all same to each factories.

So, Why choose our self-drilling anchor hollow bars?

First, SDA (IBO) is a kind of Safety product.

Safety Self Drilling Anchor Rock Bolt must be High capacity with energy absorbing:

– Drilling is only the beginning of Reinforcement Anchoring, reliable support is the core value.
VS. Just for drilling (sometimes even sudden fracture when drilling).
– Agt > 5%, High homogeneous elongation ability can bear large deformation of surrounding rock without failure.
VS. Just meeting the strength index of the SDA. Confuse the concepts of plasticity index.
– Rm/Rp0.2 > 1.2, High strength reserve provides ample safety coefficient for projects.
VS. The strategy is to reduce the cost by sacrificing quality.

Second, Safety product must be Stable.

Stability and Uniformity of products assure the quality of project engineering.
VS. Unstable products leave a nightmare and hidden troubles to construction staff and users.

Third, Safety product must be precision.

Assembly of High quality, high precision, high performance Self-Drilling Anchors and accessories are reliable.
VS. Crude hollow anchor bars with low-quality is the humiliation to “Made in China”. It only exports to “jerry building” in the world.

You can contact us for the whole analysis of self-drilling anchoring products.

Established in the early 1990s.

The first and best manufacturer of SDA ( Self drilling Anchor Rock Bolt ) in China.

ONTON Technology Co., Ltd. is the main compiling units of the Chinese Railway Standard named “Technical Regulations for Hollow Bolt”.

We participate in the ministry of railways Self-drilling Anchor Rock Bolt standards and almost all of the high-speed railway construction in china.

OEM accepted.

1. Products standards:

‘EU Construction Products Directive’: EN 14199:2005 Micropiles and EN 14490:2010 Soil Nails.

2. What the EU standards require?

EN 14199:2005 “Micropiles”, clause 6.2.1 and EN 14490:2010 “Soil Nails”, clause require:

Yield Stress, fyk, between 400 to 600 MPa (60 to 87 ksi)

Ductility (Elongation Agt > 5% required by EN 10080, ASTM A615 , ASTM A370)

All the required properties above are tested of Finished hollow-bar, NOT raw materials.

3. What is Agt?

Agt denotes the elongation up to ultimate load without reduction of cross-section.

It is not to be confused with total elongation, A, up to rupture.

Usually elongation, A, has double the value of Agt.

4. What is the standard of quality for SDA? Is the higher the strength, the better?

No, the grade of material strength is based on its yield strength. However, for the Grade of Product Quality, the key index should be its ductility (i.e. the values of Agt and Rm/Rp0.2, according to Eurocode EC2).

5. How about the packaging or shipping?

Generally: 50 pcs anchor rock bolt per bundle, wrapped in woven bags or as requirement.

  • Download Charts
  • Download Excel File
  • Download PDF File
  • Download Word File

Related Products

T76 Hollow Threaded IBO Anchor Bar Series
A good alternative to Ischebeck Titan CTS Drilling System. Self-drilling, injection boring anchoring systems for underground works.
Galvanized Self-Drilling Anchor Hollow Bars
Corrosion protected Self-Drilling Anchor hollow bars. Galvanized in accordance with EN ISO 1461:1999.
Drill Bits for self-drilling anchoring system
Button Bit for CTS DYWIDAG Minova drilling systems
R38 Hollow Threaded Drilling Anchor Bolt
A good alternative to DYWI Hollow Drill Rods or MAI SDA. Self-drilling, injection anchoring systems for underground works.