ABOUT TYPES OF SCREW HEAD DRIVES

Thread limit or pitch diameter limit is a standard employed for classifying the tolerance in the thread pitch diameter for taps. For imperial, H or L limits are used which designate what number of units of 0.0005 inch over or undersized the pitch diameter is from its standard benefit, respectively. Therefore a tap designated by having an H Restrict

To tell apart on their own from Phillips screws, JIS screws generally have a little dot upcoming for their cross slot.The tri-angle screwdriver resembles its name, featuring a triangular recess from the suggestion. You will discover triangular screws in an array of toys, electronics, and appliances, but You may additionally see them in more specifi