SGE series Module 0.5 Pressure angle 20° (regular teeth) Number of teeth: 80 Shape: B1 Standard circle diameter d(mm): 40 Hole diameter d(mm): 6 Tooth width b(mm): 5 Module m: 0.5 Number of teeth Z: 80 Tip circle diameter da(mm):41 牙齿宽度W(mm):5 孔直径DD(H7)(MM):6 集线器外部形状DH(mm):28 集线器长度LH(mm):8 总长度L(mm):13