MF47 Friction Bolts(Split set bolt)

MF47 Friction Bolts also called Split Set Stabilizer,Friction Bolts Split Sets, is an indispensable advanced material for underground mining support.

MF47 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

MF47 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.

MF47 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.

Dimensions Physical Properties Technical Data
Bolt Diameter  A 47mm Yield Strength Min. 345 Mpa (120KN) Recommended Normal Bit Size 41-45mm
Bolt Length  B 0.9-3.0m Typical 445Mpa(150KN)
Taper End Diameter  C 38mm Tube Ultimate Tensile Strength Min. 470 Mpa (160KN) Typical Breaking Capacity 178KN
Taper Slot Wide  D 2mm Typical 530Mpa(180KN)
Taper Length  E 100mm Mass per Meter 2.71 Kgs Min. Breaking Capacity 133KN
Bolt Slot Wide  F 25mm
Ring Location  G 8mm Cross Section Area 345 mm² Recommended Initial Anchorage 6-10 Tons               (53-89 KN)
Material Guage  H 3/3.2mm
Ring Wire Guage  I 8mm Hole Diameter Range 43-45.5mm Ultimate Axial Strain Typical 21% (Thk<16mm)
Ring Open Gap  J 6-7mm


MF47Friction 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.

Bolt Description Diameter Length Surface Finish Weight Packing
(mm) (mm) (Kgs)
Friction Bolts MF47-900 47 900 Untreated 2.5 200
Friction Bolts MF47-1800 47 1800 Untreated 5.1 200
Friction Bolts MF47-2100 47 2100 Untreated 6.1 200
Friction Boltst MF47-2400 47 2400 Untreated 6.7 200
Friction Bolts MF47-3000 47 3000 Untreated 8.6 200
Friction Bolts MF47-900 HDG 47 900 Hot Dip Galvanized 2.6 200
Friction Bolts MF47-1800 HDG 47 1800 Hot Dip Galvanized 5.5 200
Friction Bolts MF47-2100 HDG 47 2100 Hot Dip Galvanized 6.4 200
Friction Bolts MF47-2400 HDG 47 2400 Hot Dip Galvanized 7.1 200
Friction Bolts MF47-3000 HDG 47 3000 Hot Dip Galvanized 9 200


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 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.

Friction Bolts Split Sets