What is a 90 degree turn on a bolt?
What is a 90 degree turn on a bolt? 90° = quarter turn. 180° = half turn. It's alright if you are off a few degrees. Is it possible to turn a bolt to 60 degrees? You've just turned the bolt as close to 60 degrees as you're going to get without a Torque Angle meter (which I have found be very difficult if not impossible to use correctly in most real world cases anyway). This approximate 60 degree turn you just made is close enough to the first 55 degrees stated in the instructions. What should head bolts be...