SGE series Model 2.0 Pressure angle 20° (regular teeth) Number of teeth: 25 Shape: B1 Standard circle diameter d(mm): φ50 Hole diameter (mm): 8 Tooth width b(mm): 20 Model m: 2.0 Number of teeth Z: 25 Tip circle diameter DA(mm):φ54 牙齿宽度DD(H7)(MM):φ8 集线器外部形状DH(mm):φ40 集线器长度LH(mm):20 总长度L(mm):40