Originally Posted by 02GTowner
Just so I am sure there is a very noticeable visual and auditory click where you reach the specified torque correct? The first time it did it I thought I snapped a plug or stripped the threads. Glad to know there is a break in period which i though because I could feel it happening but just wasn't sure.
It just "snaps-over" and returns to the next "free" position. The way it works is that the rotating input at the top has four ramps. The body of the socket has a spring-loaded ball that presses against one of the ramps at any point in time.
The spring tension is calibrated so that as you turn the input of the socket the ball "climbs" up the active ramp, compressing the spring; when the calibrated torque has been attained the ball falls off the peak of the ramp into the valley of the next. The socket makes a snap and releases when the ball falls off the ramp.
Because there are four ramps the socket has four active positions.
In theory you could just keep turning the socket as many times as you like and the plug would get no tighter as the torque is limited by the spring/ball/ramp action (I did test this using a digital torque adapter
and found it to be true), however in practice there is no need to do this, one ramp-up and release is all that is needed.
So, as long as you turn the socket past at least one "snap" it is impossible to under- or over- torque the plug.