How to distinguish between screw size corresponding to the big wrench?
The opening wrench for the outer six angles is more accurate with the six angle nut, since there are six angle bolts and small hexagon head bolts. Wrench specifications used for 7, 8, 10, 14, 17, 19, 22, 24, 27, 30, 32, 36, 41, 46, 55, 65; the corresponding thread specifications for the M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42.
Method before tapping threaded hole diameter; for brittle materials in accordance with the basic dimensions of -1.0826 pitch, for plastic materials in accordance with the basic dimensions of +0.1 - thread pitch of brittle materials for cutting in tapping, thread bottom hole size for bottom diameter, because the material at the time of the tapping force resulting from plastic deformation of plastic material. The material will move to the thread, the bottom should be appropriate to increase. For threaded holes under M6, regardless of material properties, be unified according to basic dimensions - pitch.
A full set of six angle wrench, minimum specification of 3, and its corresponding relationships for S3=M4, S4=M5, S5=M6, S6=M8, S8=M10, S10=M12, S12=M14-M16, S14=M18-M20, S17=M22-M24, S19=M27-M30, S24=M36, S27=M42.
