Countersunk Machine Screw Length Measured Is Not The Same?

Recently, when I visited the buyers of many shops, many comments under the countersunk machine screw said that the length they measured was not the same as the length measured by the seller. Why?

Measuring tools. General sellers, especially screw manufacturers, measure the size of the screws using calipers and micrometers. However, the dimensions measured by different calipers are still different. This involves the issue of accuracy. Some of the pictures sent by the buyer show the use of a tape measure to measure the countersunk machine screw. The error of this measurement will be large and generally not accurate. We generally take the caliper measurement as the standard.

Measuring position. Some people measure the length of the countersunk machine screw from the bottom of the head. This is the wrong method. The length measurement of the flat countersunk machine screw is different from the general screw measurement, which measures the full length and includes the head.

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