MF33 Friction Bolts(Split set bolt)

MF33 Friction Bolts also called Split Set Stabilizer,Friction Bolts Split Sets, is an indispensable advanced material for underground mining support.

MF33 Friction Bolts  is a very specific support product, and it is an advanced material used for the support of the roof of the underground copper or gold mining and other projects.

Product Description


MF33 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.

MF33 Split Set Bolt is mainly used to establish ground support when hand-held mining operations are required. Our MF33 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.

DimensionsPhysical PropertiesTechnical Data
Bolt DiameterA33mmYield StrengthMin. 345 Mpa (70KN)Recommended Normal Bit Size31-33mm
Bolt LengthB0.6-1.8mTypical 445Mpa(95KN)
Taper End DiameterC28mmTube Ultimate Tensile StrengthMin. 470 Mpa (100KN)Typical Breaking Capacity107KN
Taper Slot WideD2mmTypical 530Mpa(115KN)
Taper LengthE65mmMass per Meter1.67 KgsMin. Breaking Capacity71KN
Bolt Slot WideF12mm
Ring LocationG3mmCross Section Area212 mm²Recommended Initial Anchorage3-6 Tons(27-53KN)
Material GuageH2/2.5mm
Ring Wire GuageI6mmHole Diameter Range30-32mmUltimate Axial StrainTypical 21% (Thk<16mm)
Ring Open GapJ5-6mm


MF33 Friction Bolts can be load tested by fitting a special ring to the bolt prior to its installation.  Pull tests can then be conducted with a hollow ram hydraulic jack.Further corrosion protection can be provided by hot dip galvanizing.

The same as the self-drilling anchor bolt the surface treatment methods can be hot-dip galvanized, electro-galvanized or surface epoxy coating, and all need to be used with Volcano Plate.

MF33 Friction Bolts(Split set bolt)

Bolt DescriptionDiameterLengthSurface FinishWeightPacking
Friction Bolts MF33-60033600Untreated1300
Friction Bolts MF33-90033900Untreated1.5300
Friction Bolts MF33-1200331200Untreated2300
Friction Boltst MF33-1500331500Untreated2.5300
Friction Bolts MF33-1800331800Untreated3300
Friction Bolts MF33-600 HDG33600Hot Dip Galvanized1.05300
Friction Bolts MF33-900 HDG33900Hot Dip Galvanized1.58300
Friction Bolts MF33-1200 HDG331200Hot Dip Galvanized2.1300
Friction Bolts MF33-1500 HDG331500Hot Dip Galvanized2.63300
Friction Bolts MF33-1800 HDG331800Hot Dip Galvanized3.15300


The JIUFU Underground Mine Friction Bolts is manufactured from high strength steel tube which has a slot along its entire length.   A ring, or collar, is welded on the outer end to hold a domed plate to the rock surface.

Friction Bolts-Split set rock bolt


Friction Bolts Product Features

1.The raw material is made of high-strength alloy steel strip.

2.The installation is the simple.

3.No anchoring agent is required.

4.The friction strength between the bolt and the rock is large.

5.It has high shear and tensile strength.

6.Equipped with a high-strength plate.