(mm) M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 P 0.35 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2.5 3 smax 0.724 0.902 1.295 1.545 2.045 2.56 3.071 4.084 5.084 6.095 8.115 10.127 12.146 smin 0.711 0.889 1.27 1.52 2.02 2.52 3.02 4.02 5.02 6.02 8.025 10.025 12.032 e min 0.803 1.003 1.427 1.73 2.3 2.87 3.44 4.58 5.72 6.86 9.15 11.5 13.8 t min 0.6 0.6 0.7 0.6 1 1.2 1.8 1.8 2 3 3 6 5 dz max 0.8 1 1.2 1.4 2 2.5 3 5 6 8 10 14 16 dz min 0.55 0.75 0.95 1.15 1.75 2.25 2.75 4.7 5.7 7.64 9.64 13.57 15.57 Hex head knurled set screws are a type of screw used to secure an object with or against another object, like a pulley or gear to a shaft. These screws generally have no head projecting past the major diameter of the screw thread making them headless or blind. They are designed for a snug fit when securing objects in place and the knurling on the head of the screw provides an extra grip for easier installation and removal. Hex head knurled set screws are made of a strong and durable material making them ideal for a wide range of industrial applications.