... holes with hole angle of 60 E: Screw with long lead K: Micro/Small Screw T: External circulation and pipe ... Circuit No.(turns No.* line No.) Turn No.: T:1,A:1.5,B:2.5,C:3.5 ... double trim; N: No-trim; S: single-trim9 F: Rolling G: Grinding10 Precision Grade of Lead: C0,C1,C2,C3,C5 ... , repeat positioning accuracy, shiffness, lead length, hole diameter of screw cap and so on.As a professional manufacture, we ...