The design is often criticized for its tendency to cam out at lower torque levels than other “cross head” designs. There has long been a popular belief that this was a deliberate feature of the design, to assemble aluminium aircraft without overtightening the fasteners.[15]: 85 [16] There is no good evidence for this suggestion, and the property is not mentioned in the original patents.[17]
That’s the point of Philips. They’re for assembly line manufacturing designed to torque out when they’re tight.They’re awful.The problem with JIS is that most people don’t have a JIS driver.
Wikipedia disputes the claim of cam out being deliberate
Fair enough.
That makes them trash to me, if that’s not a feature.