The difference between cold-rolled screw (rolled screw) and grinded screws

1.Manufacturing process: Cold rolled screw rods are manufactured by cold rolling process, while ground screw rods are manufactured by grinding process. Cold-rolled screw rods are formed by pressing metal blanks through a cold rolling mill at room temperature, while ground screw rods are made by precision grinding of metal round rods.

2.Surface finish: The surface finish of the ground screw rod is higher, usually reaching Ra0.2-0.4, while the surface finish of the cold-rolled screw rod is lower, usually around Ra1.6.

3.Tolerance class: The tolerance level of ground screw rod is usually higher than that of cold rolled screw rod, which can reach IT6-IT7 level, while the tolerance class of cold rolled screw rod is usually IT8-IT9 level.

4.Processing accuracy: The machining accuracy of ground screw rod is higher, which can reach about 0.01mm, while the processing accuracy of cold-rolled screw rod is usually about 0.1mm.

5.Service life: Due to their higher machining accuracy and surface finish, ground wire rods may have a longer service life compared to cold-drawn wire rods.

6.Scope of application: Cold-rolled screw rods are usually used in occasions that do not require high precision, such as transmission mechanisms, conveying machinery, etc.; while ground screw rods are suitable for occasions that require high precision, such as high-precision machine tools, optical instruments wait.

Overall, ground wire rods have higher machining accuracy and surface finish, making them suitable for applications with higher precision requirements. Cold-drawn wire rods are more cost-effective and suitable for applications with lower precision requirements. When selecting wire rods, the specific usage needs and budget should be considered to choose the appropriate type of wire rod.