SGE series Module 0.5 Pressure angle 20° (regular teeth) Number of teeth: 30 Shape: B1 Standard circle diameter d(mm): 15 Hole diameter b(mm): 4 Tooth width b(mm): 5 Module m: 0.5 Number of teeth Z: 30 Tip circle diameter DA(MM):16 牙齿宽度DD(H7)(MM):4 集线器外形DH(mm):12 集线器长度LH(mm):8 总长度L(mm):13