M3M4M5M6M8M10M12 The left cross tooth fine die is made of cobalt bearing high speed steel M35 The material is only made of, usually with outer diameter 20,25,38,45,50,60,75,85,100,130 Wait for a few approximate die diameters, usually M1-M6 The outer diameter of is twenty ， M6-M12 Is the outer diameter twenty-five ， M13-M20 Outer diameter is thirty-eight These three outer diameters basically include the common types of die, M3M4M5M6M8M10M12 The thread specification of the left cross tooth fine die is the same as that of the screw tap. It also has coarse teeth, standard teeth, fine teeth and fine teeth, for example M6X1.0, This is called coarse tooth, M6X0.75 They are standard fine teeth, M6X0.5 Fine teeth, M6X0.35 For fine teeth, the most common is M4X0.5,M5X0.5,M6X0.5 These three fine tooth specifications, of course, also have M12X1.M14X1,M12X0.75,M14X0.75 These fine tooth specifications,. The left die is also a commonly used die specification, but the fine left tooth is not very common, and the fine left tooth double head die will not be in stock, but this specification is usually seen in the processing of brass parts for thread inserts of electrical products, such as M6X0.6 Double head left die is a common specification of brass parts for electrical appliances. Also common is M6X0.75 Double headed left teeth belong to this category. M3M4M5M6M8M10M12 The fine die of the left cross tooth is generally made into an adjustable type, because although the tolerance of the adjustable type is relatively poor, this disadvantage can be avoided under the support of the die holder, and because of the advantage of the adjustable type, it can be adjusted when the precision of the die is uncertain or the outer diameter of the screw germ is inaccurate.
