Rock bolts with shells include convex edges

Rock bolts with shells include concave bits

Bolt number

Maximum pull-out force (KN)

Bolt number

Maximum pull-out force (KN)

1

59.1

1

0.23

2

89.3

2

0.15

3

19.6

3

0.13

4

10.2

4

0.23

5

10.1

5

0.26