This study examines the differences between the laboratory vane shear test standards set by ASTM D4648/D4648M-16 and BS 1377: Part 7: 1990. The primary distinction between these standards lies in their recommended shear rates: BS suggests a rotation speed range of 6 to 12° per minute, while ASTM recommends a range of 60 to 90° per minute. Since shear strength in fine-grained soils is strongly influenced by shear rate due to soil structure and pore water pressure response, understanding these differences is theoretically important for interpreting laboratory result. Testing was conducted on a kaolinite sample with three different liquidity indices: 0.8, 1.0, and 1.2, and seven rotation speed ranges: 2°, 7.2° (following BS), 12°, 24°, 48°, 72° (according to ASTM), and 90° per minute. For one hour, the samples were subjected to consolidation pressures of 0, 24.5, 49, and 98.1 kPa. The results indicated that shear strength increased with higher rotation speeds, peaking at 90° per minute. Conversely, shear strength decreased as the water content in the samples increased. Moreover, higher consolidation pressures corresponded with higher shear strength values. The shear strength values obtained from the fall cone test were found to be similar to those from the vane shear test at a rotation speed of 72° per minute. These findings offer practical insight for geotechnical engineering, particularly in foundation and slope stability analysis where choosing an appropriate shear rate is critical to obtaining reliable soil strengh parameter.