Standard-- bs 4395-1, GB853 , JB /ZQ 4338 The washer designed for protect the bolt when there is only one side force and reduce the pressure from the channel steel
Screw Thread d | M6 | M8 | M10 | M12 | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | M36 | ||
d | max | 6.96 | 9.36 | 11.43 | 13.93 | 17.93 | 20.52 | 22.52 | 24.52 | 26.52 | 30.52 | 33.62 | 39.62 | |
min | 6.6 | 9 | 11 | 13.5 | 17.5 | 20 | 22 | 24 | 26 | 30 | 33 | 39 | ||
s | 16 | 18 | 22 | 28 | 35 | 40 | 40 | 40 | 50 | 50 | 60 | 70 | ||
h | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | ||
h1 | 3.6 | 3.8 | 4.2 | 4.8 | 5.4 | 7 | 7 | 7 | 8 | 8 | 9 | 10 | ||
per 1000 units ≈ kg | 4.75 | 5.79 | 9.31 | 16.9 | 28.22 | 50 | 47.43 | 44.61 | 84.33 | 76.78 | 128.3 | 187.7 |