Why is it easy to make mistakes when measuring oval head machine screws black oxide?

Many customers are very easy to measure errors when buying oval head machine screws black oxide. Why?

Let’s take a look at the drawings of the slotted oval head machine screws black oxide, which is labeled with the dimensions we need to pay attention to. Where d is the diameter of the thread, l is the full length of the screw including the countersunk head (excluding the protrusion above the head), k is the thickness of the head of the countersunk head, dk is the diameter of the head, and n is the groove Width, t refers to the groove depth, f refers to the thickness of the convex portion above the countersunk head, and rf refers to the curvature of the protrusion.

Many people measure the black oval head machine screws black oxide when measuring from the protrusion of the head, and count this part as the total length. This is very easy to make mistakes, because many times when the drawing is marked, the full length of the screw does not include the convex part of the head, so the measured result will be different from the drawing.

If you want to customize oval head machine screws black oxide, please send an email: annie.li@szsst88.com