The laboratory short encapsulation pull out test (LSEPT) has been widely accepted as the most efficient method to characterize the mechanical behaviour of cable bolts under axial loading. In this study, a number of LSEPTs was performed on conventional cable bolts including Plain SuperStrand and TG cable bolts using the improved pull out test design. The effects of several parameters including the uniaxial compressive strength (UCS) of confining medium and grout and the borehole diameter on the mechanical behaviour of both cable bolts were investigated. Analysis of Variance (ANOVA) was employed to quantify the contribution of these parameters on the responses including peak and residual loads and initial stiffness. ANOVA revealed that UCS of confining medium and grout is the key contributing factor to the mechanical behaviour of Plain SuperStrand cable bolt. Also, it was demonstrated that the borehole diameter had a negligible impact on the overall behaviour of TG cable bolt while the peak load of SuperStrand cable bolt was increased due to an increase in the diameter of borehole. Finally, from a comparative analysis, it was confirmed that TG cable bolt exhibits a higher load carrying capacity than Plain SuperStrand cable bolt.