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A: Metric screws B: US standard screws C: Imperial screws

A: Metric mechanical screws: Metric

M3 x 6 – P P B: M3 mechanical screw, 6 mm long, cross shape, round flat head, black-plated.

Code Completion: Appearance Processing Specifications

Head Code: External Shape of the Head.

Shape of the screw head. Cylindrical head. Semi-dip head. Dipped head. Spherical cylindrical head. Plate head. Half-round head. Hexagon head.

Thread Code

Screw model: Drive Code: Head notched, special model

Length Code: Screw Length (mm)

A-1: Thread Code: Screw Model

Metric screws are denoted by the outer diameter of the screw itself.

For example, M3 refers to a screw with an outer diameter of 3.00mm; M4 refers to a screw with an outer diameter of 4.00mm.

Metric Thread Size x Pitch:

Note: Metric screws are indicated after the screw model, and sometimes the thread pitch is also specified.

Such as M3x0.5, M4x0.70, M5x0.8, M6x1.

However, due to standard regulations, it is usually not mentioned.

A-2: Length Code: Screw Length:

Metric screws are marked directly with the screw length, measured in mm.

The total length indication for the screw refers only to the length below the head, excluding the head height.

However, flat-head screws are an exception; the total length indicated for them includes the head height.

A-3: Drive Code / Head Groove, Characteristics.

A: Metric screws B: American screws C: British screws

A: Mechanical screws: Metric

Example: M3 x 6 -- P P B: M3 mechanical screws, 6 mm long, cross, round flat head, plated black.

Code Completion: Appearance processing specification

Head Code: appearance of the head.

Screw head shape. Cylindrical head. Half-sunk head. Heavy head. Spherical cylindrical head. Raise your head. Half-round head. Hexagonal head.

Thread Code

Drive Code: Head trench, feature model

Length Code: Screw length (mm)

A-1: Thread Code: Screw type

For metric screws, the screw type is directly indicated by the outer diameter of the screw.

Such as M3; the outer diameter of the screw is 3.00mm. M4 indicates that the outer diameter of the screw is 4.00mm.

Metric Thread Size x Pitch:

Note: Metric screws are listed behind the screw type; sometimes the screw spacing is indicated.

Such as M3x0.5, M4x0.70, M5x0.8, M6x1.

But due to the standard rules, it is usually not mentioned.

A-2: Length Code: Screw length:

Metric screws, which directly indicate the screw length in millimeters.

The total length of the screws is indicated by counting the length below the head only, excluding the head height.

With the exception of flat head screws, the total length of screws is indicated by the head height.

A-3: Drive Code / head trench, features.