Model RBQ(C)3009 RBQ(C)2508 RBQ(C)2007 RBQ(C)1604 RBQ(C)3213 O.D. thread (mm) M16 x 1.5 M20 x 1.5 M25 x 1.5 M30 x 1.5 M32 x 1.5 Thread prepared bore (mm) 18.7 + 0.1 0 28.7 + 0.1 0 14.7 + 0.1 0 23.7 + 0.1 0 30.7 + 0.1 0 Tightening torque (Nm) 14.7 23.5 34.3 78.5 88.3 Operating Environment 2.