The accuracy levels of key locking inserts, often referred to as "threaded inserts" or "thread repair inserts," can vary depending on the manufacturer and the specific application requirements. However, similar to other types of threaded inserts, key locking inserts are typically classified based on international standards such as ISO (International Organization for Standardization) or ANSI (American National Standards Institute).
Common accuracy levels for key locking inserts may include:
4H (H4) Class: This is a high-precision level suitable for applications where both the internal and external threads of the insert require extremely precise tolerances. It is often used in applications that demand a high level of precision fit.
5H (H5) Class: Slightly lower in precision compared to the 4H class, the 5H class still offers high accuracy and is suitable for applications where the threads of the insert require high precision but not to the extent of the 4H class.
6H (H6) Class: This is a common medium-precision level suitable for many general industrial applications. It meets the requirements of most mechanical connections.
7H (H7) Class: Slightly lower in precision compared to the 6H class, the 7H class is suitable for general mechanical connections that do not have stringent accuracy requirements.
8H (H8) Class: This is a low-precision level typically used in applications where tight tolerance fits are not critical.
As with any threaded fastener or insert, the choice of accuracy level for key locking inserts should be based on the specific requirements of the application, including factors such as load-bearing capacity, environmental conditions, and assembly methods. It's essential to consult the manufacturer's specifications and standards to ensure the chosen insert meets the desired accuracy level.