T=(0,5~0,7)*k*s*As*d/1000 Ular orasida T: tortilish momenti, Nm k: tortish kuchi koeffitsienti, odatda 0,12 s: murvat materialining oquvchanligi, Mpa As: xavfli Kesma maydoni, mm2 d: Nominal diametri, mm Hebei Chengyi Engineering Materials Co., Ltd.
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