M24 Rock Bolts (also known as coal bolts) have been developed for use in point anchored or fully encapsulated roof and rib bolting applications.
Manufactured with a rolled M24 x 3.0 mm pitch right hand thread and a ribbed surface profile. Suitable for high load transfer and easy resin and grout application. Supplied complete with an anti-friction washer, dome washer and hexagonal 36 mm drive nut.
Recommended for use in 27 – 28 mm diameter holes. For >28mm diameter holes it is recommended to use Minova Secura bolt range.
Available in either standard “S” mild steel grade or extra high tensile “X” HSAC840 superior steel grade. X steel grade provides greater potential performance in conditions subject to stress corrosion cracking. Multiple lengths, diameters, pin and paddle configurations are available.
We can supply a comprehensive range of plates for use with Coal bolts. Plates most typically used with Coal bolts are:
LOKSET® RESIN CAPSULES
The Lokset resin system provides rapid anchoring of the bolt to the surrounding strata. The rotation of the bolt during installation ruptures the capsule, shreds the skin and mixes the two components transforming the resin mastic into a solid anchor.
Standard “point” anchorage will be firmly interlocked with the substrate and bolt within minutes. The setting time of the resin components can be controlled. A combination of fast and slow setting cartridges makes it possible to simultaneously anchor, grout and tension the rock bolt.
|MECHANICAL PROPERTIES||M24 X GRADE||M24 S GRADE|
|Nominal Rib Height Diameter (mm)||23.2||23.2|
|Nominal CrossSectional Area of the Bar (mm2||370||370|
|Yield Stress (Strength MPa)||650||340|
|Yield Force Diameter (MT)||24.6||12.8|
|Tensile Stress (Strength MPa)||890||490|
|Tensile Force Typical (MT)||33.7||18.6|
|Elongation (%) 5D||19||27|
|Mass per metre – Bar (kg/m)||2.9||2.9|
Manufactured from high-strength steel and designed to help prevent loose material from falling between the roof bolt pattern and provide strength to your immediate roof.
Options of each plate type are available in numerous dimensions to suit any bolt type and diameter in the Minova range. Plates are available with or without a hanger loop in black steel or hot dip galvanised.
Further developing our plate range, our 200 mm Crown plate is a cost-effective alternative to Combi plates, reducing the number of plates required and providing improved strata support.
Lokset capsules are filled with a reinforced thixotropic polyester resin in one compartment and a catalysed mastic filler in the other, separated by a physical barrier. The rotation of the bolt during installation ruptures the capsule, shreds the skin and mixes the two components causing a chemical reaction and transforming the resin mastic into a solid anchor.
The Secura Bolt is a solid reinforcing bar for use in strata environments of underground mines. Design includes a unique paddle system to improve resin mixing and resin film shredding. Consistent and efficient mixing of resin capsule components provide higher bond strength in large diameter boreholes
The solid reinforcing bar is threaded at one end with a high strength R thread profile, including a modified rope thread with large root and small crest areas. A torque nut is attached at this end. Available in various lengths and can be supplied black or hot dip galvanised.
R24 Secura Bolt
R24 Secura Debonded Bolt
R27 Secura Bolt
R27 Secura Debonded Bolt
Click here to read our comparative testing information bulletin.