Now the role of the screw is mainly to connect the two workpiece together, the role of fastening, screw is the general equipment to be used, such as mobile phones, computers, cars, bicycles, all kinds of machine tools, equipment, almost all machines need to use the screw.Screw for the daily life of the indispensable industrial necessities: such as cameras, glasses, clocks, electronics and other use of small Screws;General screws for televisions, electrical products, Musical Instruments, furniture, etc
The outer diameter of the metric thread is in millimeters, such as 6,8,10,12,18,20 mm, etc. The pitch is also in millimeters, such as 0.5,0.75,1,1.5,2,3, etc The outside diameter of an inch thread is in inches (25.4 mm per inch) such as 3/16,5/8,1/4,1/2, etc. So the outside diameter reading with a metric caliper is often irregular decimal. Inch pitch is indicated by the number of teeth per inch.Set the caliper at 25.4 mm, align one ruler to the thread tip, the other ruler to the inch thread if the thread tip is aligned, and metric thread if the thread tip is not aligned. When measuring the screw pitch, it is best to print the tip of the screw thread on the white chalk. The print on the chalk is clearer and easy to measure.Measure the metric pitch by measuring a length like 10,15,20, millimeter, etc. Count how many teeth there are and work out the pitch Thread specifications in inches are for inch threads, e.g. G1".Metric threads are those whose thread specifications are specified in metric units of millimeter.Such as: (. The imperial system is determined by how many teeth are in one inch (2.54 cm) and is usually at a 55-degree Angle.Metric system is the number of MM between the two teeth to determine the pitch, generally 60 degrees Angle Foot screw: A screw used to fasten a machine, etc. to the ground.Also called anchor bolt. Imperial screws and American system with visual, it is hard to tell the difference between British and American difference inch screw thread rolling Angle of the screw is 55 degrees, and American screw thread rolling Angle of 60 degrees, the two standard screws in most of the time can be universal, but 1/2 specifications of the screw, because standard thread for 1/2 inch 1/2-12 teeth,It's 1/2-13 teeth in the US.
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