The main aim of this research is to compare the cylindricity tolerance and roughness of holes made in normalized and annealed EN8 steel with that of untreated EN8 steel. EN8 steel plate with a thickness of 10 mm was used in this research work. EN8 steel was normalized at 750 °C and annealed at 840 °C with the aid of a muffle furnace. Then drilling was carried out with tungsten carbide drills. Cylindricity tolerance tests and surface roughness tests were carried out as per the ASTM standards. Each plate of the experimental group (annealed and normalized EN8 steel) and control group (untreated EN8 steel) contains 39 test samples (N = 39). G power 80% was used to calculate sample size. Untreated EN8 steel appears to have more cylindricity tolerance and roughness (0.0601 µm, 3.95 µm) than Normalized EN8 steel (0.0533 µm, 3.28 µm) and annealed (0.0489 µm, 3.08 µm) EN8 steel. According to statistical analysis it appears that significance is p = 0.000 and p < 0.05. Within the limitations of this study, it has been found that heat treatment of EN8 steel improved the surface roughness and tolerance, particularly annealing yielded a significant increase in the surface roughness and tolerance of EN8 steel.