Expansion Shell Coal Bolt

Minova’s Expansion Shell Bolt range provides immediate point‑anchored ground control for mining operations that need fast, dependable support without resin or grout. Designed for roof and rib support, the system is tensioned on installation, setting the expansion shell firmly against the borehole wall to provide immediate and effective ground support. Our KR‑1 and KR‑2 assemblies pair M18 threaded rods (Ø18.3 mm AP 600 steel) with Ø25 mm shells to suit a 25.4 mm borehole, delivering at least 100 kN capacity and a working load of 130 kN. Plates and washer options (square, round, octagonal, and side‑hole) support diverse site needs; installation targets a minimum 30 kN prestress at ≥ 250 Nm torque. Certified by the INOVA Technical Innovation Centre (No. 68/4/2017). For higher useful load applications, KE‑3W and KE3‑2K use Ø36 mm shells with M20 thread options and useful load up to 170 kN, combining rapid bolting with multiple head and plate configurations and optional corrosion protection for extended service life. Together, these mechanical solutions help you accelerate cycles, improve roadway availability, and maintain safe, productive workings with proven Minova quality.