How tight should the blades be (bolted) screwed on?
Blade Nut torque 14 – 19 Newton Metres
Or 10 – 14 Foot lbs
Or 120 – 168 Inch lbs
It is important not to overtighten the nut, as this could crack the thread on the blade bolt, causing the blade bolt to break in use, thereby releasing the blade, which could result in serious injury to operator or bystander. The blades should be "tight" to pivot, but not loose.