1M12T 4-6 18.97 16.97 14 12 20 M4 2. 1M25T 6-16 37.36 35.36 30 12 20 M5 2. Automotive Transmission: It Is One Of The Key Components In A Car Transmission. The Helical Gear Plays An Important Role In The Forward And Reverse Switching Of The Car And The Speed Change At Different Speeds.
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