Have any of you noticed when fitting Japanese air con that the philips head screws are often a poor fit in screwdrivers.
Maybe like me you put this down to poor quality screws soureced from china or such but it turns out that is not the case.
Way back when standards for screws were being decided upon the Japanese invented the JIS screw profile, it looks like a philips but is not designed to cam out when max torque is reach so will be damaged if the wrong driver is used.
Often the screws are identified by a small dot or dimple on the head, such as on the Saginomiya fan speed controls i noticed yesterday.
I have ordered a set of Jap drivers and will report back should anyone be interested :)
The same screws are used on Japanese motorbikes so similar problem would be found when working on these too.
Maybe like me you put this down to poor quality screws soureced from china or such but it turns out that is not the case.
Way back when standards for screws were being decided upon the Japanese invented the JIS screw profile, it looks like a philips but is not designed to cam out when max torque is reach so will be damaged if the wrong driver is used.
Often the screws are identified by a small dot or dimple on the head, such as on the Saginomiya fan speed controls i noticed yesterday.
I have ordered a set of Jap drivers and will report back should anyone be interested :)
The same screws are used on Japanese motorbikes so similar problem would be found when working on these too.