A: Metric screw B: American screw C: English screw
A: Metric Machine Screws: Metric
Ex: M3 x 6 – P P B : M3 Machine Screw, 6mm Long, Cross, Round Flat, Black Plated.
Finish Code: Appearance processing specifications
Head Code: Head shape
Thread Code
Screw Type Drive Code: Head Groove, Feature Type
Length Code: Screw Length (mm)
A-1: Thread Code: Screw Type
Metric screws directly mark the screw type with the outside diameter of the screw.
For example, the outer diameter of the screw of M3 is 3.00mm.; the outer diameter of the screw of M4 is 4.00mm.
Metric Thread Size x Pitch:
Note: Metric screws are located behind the screw model and sometimes indicate pitch.
Such as M3x0.5, M4x0.70, M5x0.8, M6x1.
But because of the standard specification, it is usually not mentioned.
A-2: Length Code: Screw Length:
Metric screws, direct marking screw length in mm.
The total length of the screw indicates that only the length below the head is calculated, not including the height of the head.
However, with the exception of flat head screws, the total length of the screw indicates the height of the head.
A-3: Drive Code/ Head Profile, Features.