Expansion Shell Bolt with Forged Integral Head

Technical conditions of the Expansion Shell Bolt

Technical conditions of the Expansion Shell Boltis made of hot rooled ribbed bar or high strength bar.Two ends are rolled thread and the top end is fixed an expansion shell for point anchorage.

Key Features

1. Manufactured from high strength full threadbar with a hot forged integral head on one end and the other end has expansion shell.

2. Available in left hand or right hand thread.

3. Provide the same tensile strength on the entire length.

4. Expansion shell bolt with integral head, they are suitable for use in areas where roof is low or when long bolts tails are undesirable.

5. Nominal diameter 16mm/18mm/20mm can be supplied.

6. Corrosion protection may be provided by hot dip galvanizing or thermal diffusion.

Technical conditions of the Expansion Shell Bolt 16mm

Nominal diameter 16mm

Tensile strength Minimum 100kN

Square forged head

Forged head must be reused with 340Nm bolting                     

Expansion Shell Design

Length: 100-130mm

Length of the ribbed leaf: 75mm min

Expansion shell diameter 38mm to suit for borehole with 40-44mm diameter

Expansion shell must afford screwing for the whole length of bolt    

Mechanical strength of the expansion shell: 90kN min

Torque of roof support tightening: 250-350N.m

Accessories

Bearing Plate, Expansion Shell

How to work

After inserting the bolt into the drilling hole,rotate the pin nut and the pin nut drives the bar into the plug.The plug expands the three steel leaves,which leads to an expansion friction strength to hold the bar for a poin anchrage.

Length and Package

Length: 450-3000mm as specified

Package: 100PCs-300PCs per bundle as specified

Others: Other dimensions and designs can be customized to suit particular applications.