T73 High-Load Self-Drilling Rock Bolt
T73 is suitable for applications requiring high anchorage performance and structural stability. It is well suited to complex geological conditions, providing reliable and long-term anchorage performance.
T73 High-Load Self-Drilling Rock Bolt Overview
The T73 Self-Drilling Rock Bolt is a high-load hollow anchor bar designed for heavy-duty ground reinforcement. With a 73 mm outer diameter, available configurations provide ultimate load capacities from 1,035 to 1,865 kN. The T-thread connection provides strong mechanical engagement and reliable load transfer, while the hollow bar allows drilling and grouting as part of an integrated installation process.
Product Specifications
Hollow Anchor Bar
| Size | Outer Dia. | Ultimate Load | Yield Load | Weight | |||||
| mm | in | kN | kips | kN | kips | kg/m | lbs/ft | ||
 |
SET73L | 73 | 2.87 | 1035 | 233 | 830 | 187 | 11.20 | 7.53 |
| SET73L1 | 73 | 2.87 | 1160 | 261 | 970 | 218 | 13.20 | 8.87 | |
| SET73N | 73 | 2.87 | 1585 | 357 | 1270 | 286 | 17.80 | 11.96 | |
| SET73S | 73 | 2.87 | 1865 | 420 | 1430 | 322 | 21.20 | 14.25 | |
| Note： 1. Customized products are available based on your specific requirements； 2. 1mm=0.03937in 1kN=0.225kips 1MPa=0.1450377ksi 1kg/m=0.672 lbs/ft |
|||||||||
Coupler
| Size | Outer Dia. | Length | Weight | Note | |||||
| mm | in | mm | in | kg | lbs | ||||
 |
SST73 | 89 | 3.50 | 220 | 8.66 | 3.64 | 8.01 | With sealing ring | |
| 89 | 3.50 | 225 | 8.86 | 3.72 | 8.18 | ||||
| 95 | 3.74 | 245 | 9.65 | 5.70 | 12.54 | ||||
| 95 | 3.74 | 225 | 8.86 | 5.24 | 11.53 | ||||
Hex Nut
| Size | Key Size | Length | Weight | Note | |||||
| mm | in | mm | in | kg | lbs | ||||
 |
SST73 | 95 | 3.74 | 70 | 2.76 | 2.05 | 4.51 | Heat treatment | |
Spherical Collar Nut
| Size | Key Size | Length | Weight | Note | |||||
| mm | in | mm | in | kg | lbs | ||||
 |
SST73 | 95 | 3.74 | 70 | 2.76 | 2.22 | 4.88 | Heat treatment | |
Flat Plate
| Size | Dimensions | Thickness | Hole Dia. | Weight | |||||
| mm | in | mm | in | mm | in | kg | lbs | ||
 |
SST73 | 175×175 | 6.89×6.89 | 35 | 1.38 | 80 | 3.15 | 6.84 | 15.05 |
| 250×250 | 9.84×9.84 | 40 | 1.57 | 80 | 3.15 | 18.00 | 39.60 | ||
Centralizer
| Size | Outer Dia. | Length | Weight | ||||
| mm | in | mm | in | kg | lbs | ||
 |
SET73 | 110 | 4.33 | 45 | 1.77 | 0.61 | 1.34 |
| SET73 | 130 | 5.12 | 45 | 1.77 | 0.80 | 1.76 | |
Drill Bit
| Size | Outer Dia. | Application (Advice) | ||||||
| mm | in | |||||||
 |
EX | Sand, fills, gravel | ||||||
| SST73/130 | 130 | 5.12 | ||||||
| SST73/175 | 175 | 6.89 | ||||||
 |
EXX | Softer sedimentary rocks such as marls, mudstones, siltstone | ||||||
| SST73/130 | 130 | 5.12 | ||||||
| SST73/200 | 200 | 7.87 | ||||||
 |
Clay Bit | Clay, soft soil, marls, loose sand or gravel | ||||||
| SST73/150 | 150 | 5.91 | ||||||
| SST73/200 | 200 | 7.87 | ||||||
| SST73/250 | 250 | 9.84 | ||||||
| SST73/280 | 280 | 11.02 | ||||||
| SST73/175 | 175 | 6.89 | ||||||
 |
ESS-F | Weathered rock, stone walls, rubble | ||||||
| SST73/130 | 130 | 5.12 | ||||||
T73 High-Load Self-Drilling Rock Bolt Applications
The T73 is suitable for large-section tunnel support, high-stress rock reinforcement, deep anchoring, and other demanding geotechnical applications requiring high load capacity.
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