What is the difference between a slotted countersunk flat head screw 80° and 90°?

In the countersunk screw, some people use the slotted. Some people like it. Some people dislike it. It is convenient for him to use. The person who doesn’t like it thinks that this type of groove is not what he likes. He doesn’t want it. Or he thinks that the slot is easily destroyed. So what is the difference between a slotted countersunk flat head screw 80° and 90°?

★One obvious difference is the difference in angle. One of the slotted countersunk flat head screwis 80° and one is 90°.

★The diameter of the head is different. At the same thread diameter, different angles can result in different diameters of the head.

★The thickness of the head is different. At the same thread diameter, different angles can also result in different head thicknesses.

★Slotted countersunk head screws Under the same specifications, the groove width and groove depth of the standard slot are also different.

In the above, the same is the thread diameter of M3, the head diameter of 80° is 5.2 mm-5.5 mm, the head thickness is 1.7 mm, the groove width is 0.8 mm, and the groove depth is 0.5 mm-0.75 mm. In the 90° slotted countersunk flat head screw, the head diameter is 5.3-5.6 mm, the head thickness is 1.65 mm, the groove width is 0.8 mm, and the groove depth is 0.6 mm-0.85 mm.

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