20mm Spring Bolt
- -The main body of the spring bolt is a full thread bar bolt, with the top end coiled into a spring shape using steel wire.
- -The spring-shaped steel wire can thoroughly mix the resin.
- -Installation is quick and convenient, providing stable support for the rock strata.
- -A plastic sheath can be fitted over the middle section to provide dynamic capabilities to the spring bolt.
20mm Spring Bolt Functions:
Specially designed spring wire attached to the up-hole end ensures that the resin components are thoroughly combined and distributed evenly.The helix design helps center the bolt within the borehole during installation. This ensures the 20mm Spring Bolt is positioned optimally and improves the overall stability of the installed bolt.The system is specifically engineered for secure installation of rock bolts in underground mining and tunneling environments.
20mm Spring Bolt Features & Advantages:
Available in left-hand or right-hand thread.
Compared with other bars,thread ribs are higher,resin mixing is better,and anchoring effect is better.
Suitable for using with either resin cartridges or cement grout.
Provide the same tensile strength on the entire length.
Due to continuous thread on the entire length,the nut can be tightened upward at any place.
Available in black or hot dip galvanized.
20mm Spring bolt Mechanical Properties
| Diameter | Yield Strength | Tensile Strength | ELONGATION A% | Mass Meter | Core Dia | Major Dia | |||||||
| Min | Typ. | Min | Typ. | Min | Typ. | ||||||||
| 20mm | 515 MPa | 162 kN | 560 MPa | 176 kN | 630 MPa | 198 kN | 710 MPa | 220 kN | 18% | 24% | 2.46KGS | 19.5mm | 22.5mm |
| 22mm | 525 MPa | 199 kN | 590 MPa | 224 kN | 652 MPa | 247 kN | 761 MPa | 289 kN | 18% | 24% | 2.98KGS | 21.2mm | 23.8mm |
| 25mm | 550 MPa | 269 kN | 610 MPa | 298 kN | 684 MPa | 335 kN | 798 MPa | 391 kN | 18% | 24% | 3.85KGS | 24.8mm | 28.5mm |
20mm Spring Bolt Bearing plate:
Round plate, domed plate
20mm Spring Bolt Accessories:
Domed nut, hex nut, anti-friction washer, domed ball
20mm Spring Bolt Length & Package
Bolts are packaged in bundles.
Bolt fittings, such as nuts, anti-friction washers, and domed balls, are fitted to rock bolts in the requested configuration.
20mm Spring Bolt Applications:
Mines
Tunnels
Slopes
Places that need ground support
