M4 (4mm x 50mm) Phillips Pan Head Machine Screws - Stainless Steel A2 (Pack of 20) DIN 7985

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The metric system was based on the meter, a system of measurement whose origin was in France in the 1970s. When taking the length of a screw, we use meters.

The gauge sizes do not have a direct connection with the actual head size. When measuring the length of a flathead screw, start on top of the head down to the stem. On the other hand, start from the bottom of the head down to the stem for other types. The gauge and length determine the size.

n. Some manufacturers offer non-standard pitches, so it is best to reach out to them for any concerns in customization. If the measurement reads M2 x 8, the diameter is 2mm and has a length of 8mm. Coarse-threaded ones have a wider space between threads. We often use it with softer materials, such as drywall or wood. It is easy to install and remove.

For round-headed ones that are countersunk, start measuring where the countersunk and the oval top meet in the middle. To put it simply, this is where the oval top would rest on the surface.

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Lastly, count the threads in one inch to get the thread spacing value. To get an accurate measurement, lay the screw next to a measuring tape or ruler and count the number of threads. The thread count in the imperial system ranges from 35 to 40 threads per inch. Thread pitch and thread spacing mean the same thing, so don’t get those two confused. Buying Guide