Internal tooth lock washers have teeth along the inside diameter. They prevent nut and bolt heads from loosening. Serrated lock washers have serrations along the outside diameter that prevent loosening and increase the washer s locking power.
Screw Thread d | 1.7 | 2.2 | 2.7 | 3.2 | 3.7 | 4.3 | 5.3 | 6.4 | 7.4 | 8.4 | |||
d | min=nominal size | 1.7 | 2.2 | 2.7 | 3.2 | 3.7 | 4.3 | 5.3 | 6.4 | 7.4 | 8.4 | ||
max | 1.84 | 2.34 | 2.84 | 3.38 | 3.88 | 4.48 | 5.48 | 6.62 | 7.62 | 8.62 | |||
dc | max=nominal size | 3.6 | 4.5 | 5.5 | 6 | 7 | 8 | 10 | 11 | 12.5 | 15 | ||
min | 3.3 | 4.2 | 5.2 | 5.7 | 6.64 | 7.64 | 9.64 | 10.57 | 12.07 | 14.57 | |||
Number of Teeth | min | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 9 | 10 | 10 | ||
t | 0.3 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.8 | |||
per 1000 units≈kg | 0.02 | 0.03 | 0.045 | 0.06 | 0.11 | 0.14 | 0.28 | 0.36 | 0.5 | 0.8 | |||
For Nominal Thread Diameter | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M7 | M8 |