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Threaded bars is a hot-rolled solid bar with discontinuous external threads. It can be connected by coupler. When threaded bars are used in the field of anchoring, according to the requirements of the anti-corrosion grade, it can form different anti-corrosion systems with couplers, nuts, plates, corrugated pipes, smooth plastic pipes, end caps, and so on.
| Product Specification | Local Coating Thickness (um) | Mean Coating Thickness (um) | Max. Coating Thickness (um) |
|---|---|---|---|
| Refined Rolled Thread Bar | 70~200 | 85 | 200 |
Class I anti-corrosion anchoring system is suitable for semi-permanent support and permanent support in corrosive environment. Anchorage section is protected by corrugated pipe, end cap, cement grout, and the free section is protected by smooth plastic pipe.
Class II anti-corrosion anchoring system is used for temporary support in corrosive environment and semi-permanent support in non-corrosive environment. Anchorage section is protected by cement grout, and the free section is protected by smooth plastic pipe.
Non-anticorrosive anchorage system is suitable for temporary support in non-corrosive environments, and cement grout will protect the anchoring section.
1. Assemble the threaded bar and internal grouting solidification anti-corrosion system and put it into the hole.
2. Insert the exhaust pipe and the grouting pipe. Grouting pipe should reach the bottom of the hole, grouting method is pulling out the grouting pipe while grouting, and start the grouting pipe should be pulled out after grouting to 5m.
3. Use PO 42.5 ordinary Portland cement to prepare cement slurry, the water-cement ratio is controlled at 0.4-0.45, and the grouting pressure is controlled at 0.4-0.6Mpa until the orifice overflows. At this time, all the exhaust pipes should be pulled out and the grouting pipes should not be pulled out.
4. Use cement bag wet clay plus steel plate to seal and tightly plug, grout at 0.4-0.6Mpa stably for 5min, then pull out the grouting tube.
5. The grouting volume should be greater than 1.2 times its theoretical calculated volume.
6. After grouting, install the plate and nut.
| Dia. | PSB500 | PSB830 | PSB930 | PSB1080 |
| 15 | KTB15-Q500 | KTB15-Q830 | KTB15-Q930 | KTB15-Q1080 |
| 20 | KTB20-Q500 | KTB20-Q830 | KTB20-Q930 | KTB20-Q1080 |
| 25 | KTB25-Q500 | KTB25-Q830 | KTB25-Q930 | KTB25-Q1080 |
| 32 | KTB32-Q500 | KTB32-Q830 | KTB32-Q930 | KTB32-Q1080 |
| 36 | KTB36-Q500 | KTB36-Q830 | KTB36-Q930 | KTB36-Q1080 |
| 40 | KTB40-Q500 | KTB40-Q830 | KTB40-Q930 | KTB40-Q1080 |
| 50 | KTB50-Q500 | KTB50-Q830 | KTB50-Q930 | KTB50-Q1080 |
Hot-dip Galvanized Coating Requirements
| Product Specification | Local Coating Thickness (um) | Mean Coating Thickness (um) | Max. Coating Thickness (um) |
| Threaded bar | 70~200 | 85 | 200 |
Corrugated Pipe
| Specification | Inner Dia. (mm) | Outer Dia. (mm) | Thickness (mm) | Material |
| KPC50/60 | 50 | 60 | 1.2 | PE |
| KPC50/65 | 50 | 65 | 2 | PE |
| KPC50/68 | 50 | 68 | 1.2 | PE |
| KPC65/75 | 65 | 75 | 1.2 | PE |
| KPC67/75 | 67 | 75 | 1.2 | PE |
| KPC65/85 | 65 | 85 | 2 | PE |
| KPC80/100 | 80 | 100 | 1.2 | PE |
| KPC85/95 | 85 | 95 | 1.5 | PE |
| KPC100/110 | 100 | 110 | 1.2 | PE |
| KPC100/125 | 100 | 125 | 2 | PE |
End Cap
| Specification | Corrugated Pipe Size (mm) | Inner Dia. (mm) | Outer Dia. (mm) | Length (mm) | Material |
| KPC60/65-120 | 60 | 60 | 65 | 120 | ABS |
| KPC68/73-120 | 68 | 68 | 73 | 120 | ABS |
| KPC75/80-120 | 75 | 75 | 80 | 120 | ABS |
| KPC85/90-120 | 85 | 85 | 90 | 120 | ABS |
| KPC100/105-120 | 100 | 100 | 105 | 120 | ABS |
| KPC110/120-120 | 110 | 110 | 120 | 120 | ABS |
End Cap with Hole
| Specification | Corrugated Pipe Size (mm) | Inner Dia. (mm) | Outer Dia. (mm) | Length (mm) | Material |
| KPC60/65-90H | 60 | 60 | 65 | 90 | ABS |
| KPC68/73-90H | 68 | 68 | 73 | 90 | ABS |
| KPC75/80-90H | 75 | 75 | 80 | 90 | ABS |
| KPC85/90-90H | 85 | 85 | 90 | 90 | ABS |
| KPC100/105-90H | 100 | 100 | 105 | 90 | ABS |
| KPC110/120-90H | 110 | 110 | 120 | 90 | ABS |
Smooth Plastic Pipe
| Specification | Inner Dia. (mm) | Outer Dia. (mm) | Thickness (mm) | Material |
| KPS51/54 | 51 | 54 | 1.5 | PE |
| KPS57/60 | 57 | 60 | 1.5 | PE |
| KPS66/69 | 66 | 69 | 1.5 | PE |
| KPS82/85 | 82 | 85 | 1.5 | PE |
| KPS82/88 | 82 | 88 | 3 | PE |
| KPS92/95 | 92 | 95 | 1.5 | PE |
| KPS102/105 | 102 | 105 | 1.5 | PE |
Nut: When the threaded rod is applied in the support field, it is used to transfer the load of the plate to the anchorage section by tensioning and prestressing thread bar.
| Specification | Thread Bar Size (mm) | Across Flat (mm) | Height (mm) | Weight (kg) |
| KTB15 | 15 | 30 | 50 | 0.22 |
| KTB20 | 20 | 32 | 45 | 0.17 |
| KTB25 | 25 | 50 | 60 | 0.7 |
| KTB32 | 32 | 65 | 72 | 1.4 |
| KTB36 | 36 | 65 | 80 | 1.45 |
| KTB40 | 40 | 70 | 100 | 2.12 |
| KTB50 | 50 | 80 | 110 | 3.1 |
Plate: When the threaded rod is used in the support field, the component is in contact with the surrounding rock or soil and bears pressure from them.
| Specification | Thread Bar Size (mm) | Length (mm) | Thickness (mm) | Hole Dia. (mm) |
| KTB15 | 15 | 150 | 10 | 25 |
| KTB20 | 20 | 150 | 10 | 30 |
| KTB25 | 25 | 150 | 20 | 35 |
| KTB32 | 32 | 200 | 25 | 45 |
| KTB36 | 36 | 200 | 30 | 50 |
| KTB40 | 40 | 250 | 40 | 55 |
| KTB50 | 50 | 300 | 40 | 70 |
Coupler: It is mainly used to connect threaded rods to reach the service length.
| Specification | Thread Bar Size (mm) | Outer Dia. (mm) | Length (mm) | Weight (kg) |
| KTB15 | 15 | 38 | 110 | 0.8 |
| KTB20 | 20 | 38 | 110 | 0.7 |
| KTB25 | 25 | 50 | 132 | 1.35 |
| KTB32 | 32 | 60 | 168 | 2.4 |
| KTB36 | 36 | 70 | 200 | 3.6 |
| KTB40 | 40 | 75 | 220 | 5.2 |
| KTB50 | 50 | 90 | 270 | 9.8 |
Plastic Centralizer: It is an element that can locate the rebar centrally and ensure the grout thickness and has various types such as lantern centralizer, strap centralizer, and so on.
① Strap Centralizer：It can be divided into internal strap centralizer and external strap centralizer. It comes with a strap and becomes cylindrical when rolled up. It is used with steel bars and plastic pipes, which ensures uniform grouting thickness. It has low-temperature resistance and corrosion resistance. Compared with the lantern type, it can be installed from anywhere, convenient and fast.
| Internal Strap Centralizer | Specification | Thread Bar Size (mm) | Outer Dia. (mm) | Material |
| KCN25/45 | 25 | 45 | PE | |
| KCN25/50 | 25 | 50 | PE | |
| KCN25/60 | 25 | 60 | PE | |
| KCN25/65 | 25 | 65 | PE | |
| KCN25/75 | 25 | 75 | PE | |
| KCN28/45 | 28 | 45 | PE | |
| KCN28/50 | 28 | 50 | PE | |
| KCN28/75 | 28 | 75 | PE | |
| KCN32/45 | 32 | 45 | PE | |
| KCN32/50 | 32 | 50 | PE | |
| KCN32/65 | 32 | 65 | PE | |
| KCN32/75 | 32 | 75 | PE | |
| KCN32/85 | 32 | 85 | PE | |
| KCN40/75 | 40 | 75 | PE |
| External Strap Centralizer | Specification | Plastic Pipe Size (mm) | Outer Dia. (mm) | Material |
| KCW65/100 | 65 | 100 | PE | |
| KCW80/110 | 80 | 110 | PE | |
| KCW80/140 | 80 | 140 | PE | |
| KCW90/120 | 90 | 120 | PE | |
| KCW90/140 | 90 | 140 | PE |
② Lantern Centralizer：During installation, insert steel bar in lantern centralizer to ensure uniform grouting thickness and good corrosion resistance.
| Specification | Thread Bar Size (mm) | Outer Dia. (mm) | Material |
| KCD25/45 | 25 | 45 | UPVC |
| KCD25/55 | 25 | 55 | UPVC |
| KCD25/65 | 25 | 65 | UPVC |
| KCD25/75 | 25 | 75 | UPVC |
| KCD25/85 | 25 | 85 | UPVC |
| KCD25/95 | 25 | 95 | UPVC |
| KCD32/55 | 32 | 55 | UPVC |
| KCD32/65 | 32 | 65 | UPVC |
| KCD32/75 | 32 | 75 | UPVC |
| KCD32/85 | 32 | 85 | UPVC |
| KCD32/95 | 32 | 95 | UPVC |
| KCD40/55 | 40 | 55 | UPVC |
| KCD40/65 | 40 | 65 | UPVC |
| KCD40/75 | 40 | 75 | UPVC |
| KCD40/85 | 40 | 85 | UPVC |
| KCD40/115 | 40 | 115 | UPVC |
| KCD40/145 | 40 | 145 | UPVC |
| KCD50/80 | 50 | 80 | UPVC |
| KCD50/95 | 50 | 95 | UPVC |
| KCD50/145 | 50 | 145 | UPVC |
We are proud to provide high-quality rock drilling tool solutions that deliver reliable performance in demanding working conditions.
Trusted Rock Drilling Tools for Mining, Tunneling, Quarrying, and Hydropower Construction
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At Kelleg, quality control is built into every stage of production — from raw material sourcing to final inspection. Our rigorous Quality Management Process ensures stable performance, long service life, and reliable drilling results for every tool we deliver.
We carefully evaluate and monitor our raw material suppliers to ensure stable quality from the very beginning of production.
All incoming steel and carbide materials are strictly inspected for composition, hardness, and dimensional accuracy before entering production.
Key manufacturing steps are continuously monitored and measured to ensure every part meets design tolerances and performance standards.
Each finished product undergoes comprehensive testing and inspection before shipment to guarantee consistent reliability on site.
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