A socket set screw is also called a grub screw. It has no head and is typically tightened or loosened with a square or hex key, although a slotted set screw can be adjusted with a screwdriver. Socket set screws prevent movement of a pulley or similar machine part relative to a shaft. A cup point set screw has a rounded tip that offers excellent grip while also resisting deforming of the shaft surface. A flat point screw provides more contact with the shaft.
Screw Thread d | M1 | M1.2 | M1.4 | M1.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | M8 | M10 | M12 | |
P | Pitch | 0.25 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
d1 | max | 0.1 | 0.12 | 0.14 | 0.16 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | 0.5 | 1.5 | 2 | 2.5 | 3 |
n | max | 0.4 | 0.4 | 0.4 | 0.45 | 0.45 | 0.6 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.51 | 1.91 | 2.31 |
min | 0.26 | 0.26 | 0.26 | 0.31 | 0.31 | 0.46 | 0.46 | 0.56 | 0.66 | 0.86 | 1.06 | 1.26 | 1.66 | 2.06 | |
t | max | 0.52 | 0.52 | 0.63 | 0.74 | 0.84 | 0.95 | 1.05 | 1.21 | 1.42 | 1.63 | 2 | 2.5 | 3 | 3.6 |
min=nominal size | 0.4 | 0.4 | 0.48 | 0.56 | 0.64 | 0.72 | 0.8 | 0.96 | 1.12 | 1.28 | 1.6 | 2 | 2.4 | 2.8 |
Screw Thread d | M1 | M1.2 | M1.4 | M1.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | M8 | M10 | M12 | |
P | Pitch | 0.25 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
dp | max=nominal size | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.5 | 2 | 2.2 | 2.5 | 3.5 | 4 | 5.5 | 7 | 8.5 |
min | 0.25 | 0.35 | 0.45 | 0.55 | 0.75 | 1.25 | 1.75 | 1.95 | 2.25 | 3.2 | 3.7 | 5.2 | 6.64 | 8.14 | |
n | max | 0.4 | 0.4 | 0.4 | 0.45 | 0.45 | 0.6 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.51 | 1.91 | 2.31 |
min | 0.26 | 0.26 | 0.26 | 0.31 | 0.31 | 0.46 | 0.46 | 0.56 | 0.66 | 0.86 | 1.06 | 1.26 | 1.66 | 2.06 | |
t | max | 0.52 | 0.52 | 0.63 | 0.74 | 0.84 | 0.95 | 1.05 | 1.21 | 1.42 | 1.63 | 2 | 2.5 | 3 | 3.6 |
min=nominal size | 0.4 | 0.4 | 0.48 | 0.56 | 0.64 | 0.72 | 0.8 | 0.96 | 1.12 | 1.28 | 1.6 | 2 | 2.4 | 2.8 |