Product Description
MF39 Friction Bolts are rock bolts with only 2 parts, a tube and matching domed bearing plate. The high strength steel tube is slotted along its length. One end is tapered for easy insertion into a drill hole and the other has a welded ring flange to hold the bearing plate.
With the bearing plate in place, the tube is driven into a slightly smaller hole, using the same standard percussion drill that made the hole.
As the tube of the rock bolt slides into place, the full length of the slot narrows, causing radial pressure to be exerted against the rock over its full contact length.
MF39 Split Set Bolt is mainly used to establish ground support when hand-held mining operations are required. Our MF47 Split Set Bolt was made by high strength steel strip which special refined with very low level of Si & P in chemical components, it will make the bolt in perfect performance of supporting rocks, and help to have a good quality in galvanizing. Meanwhile, with our advanced PLC-controled auto welder, the bolt will has a very good performance when it is inserted in the rocks.
MF39 Friction Bolt-ROCK BOLTS SPECIFICATION AND MECHANICAL PROPERTYDimensionsPhysical PropertiesTechnical DataBolt DiameterA39mmYield StrengthMin. 345 Mpa (85KN)Recommended Normal Bit Size35-38mmBolt LengthB0.6-2.4mTypical 445Mpa(110KN)Taper End DiameterC30mmTube Ultimate Tensile StrengthMin. 470 Mpa (115KN)Typical Breaking Capacity124KNTaper Slot WideD2mmTypical 530Mpa(130KN)Taper LengthE65mmMass per Meter1.92 KgsMin. Breaking Capacity89KNBolt Slot WideF17mmRing LocationG3mmCross Section Area245 mm²Recommended Initial Anchorage3-6 Tons (27-53 KN)Material GuageH2/2.5mmRing Wire GuageI6mmHole Diameter Range35-38mmUltimate Axial StrainTypical 21% (Thk<16mm)Ring Open GapJ5-6mm