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As shown in the picture above, the M5-4 straight-through means that the fixed thread is M5, which is suitable for connecting 4 external and 2.5 internal oil pipes.
As shown in the picture above, the M5-4 elbow has a fixed thread of M5, which is suitable for connecting 4 outside and 2.5 inside oil pipes.
As shown in the picture above, the M5-6 straight-through means that the fixed thread is M5, which is suitable for connecting 6 external and 4 internal oil pipes.
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