Thread labeling refers to the method of marking with a specific symbol where screws are required. Threads can be divided into two types according to the use: joint thread and drive thread. Common labels include common thread and pipe thread.
The thread on the drawing needs to be marked with the specified thread code. Except for the pipe thread, the thread code is marked in the following format: Feature code Nominal diameter × Pitch (single line) Rotary guide (P pitch) (Multi-line) Pipe thread mark The format is: feature code + size code + rotation into it, the right-hand thread is omitted, and the left-hand rotation is indicated by "LH".
1, M16-5g6g means coarse thread common thread, nominal diameter 16, right-handed, thread tolerance with a median diameter of 5g, large diameter of 6g, the length of the screw is considered in the medium length.
2, M16 × 1 LH-6G means fine thread common thread, nominal diameter 16, pitch 1, left-handed, thread tolerance with medium diameter and large diameter are 6G, and the screw length is considered by medium length.
3, G1 represents the British non-sealed pipe thread, size code 1 in, right-handed.
4, Rc 1/2 means the inch thread sealing cone thread, size code 1/2 in, right-handed.
5, Tr20 × 8 (P4) represents trapezoidal thread, nominal diameter 20, double line, lead 8, pitch 4, right-handed.
6, B20 × 2LH represents zigzag thread, nominal diameter 20, single line, pitch 2, left-handed.
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