Relevant National Standards Currently in Force:
GB/T 39743-2021 - *Plain Bearings: Thermoplastic Bushings - Dimensions and Tolerances*
Although the title specifies "bushings," this standard is under the jurisdiction of the National Technical Committee on Standardization for Plain Bearings. It applies to bushings made of thermoplastic materials-whether coiled or injection-molded-and explicitly defines their dimensions, tolerances, and interchangeability requirements with ISO standards. It is applicable to certain structural components of the coiled plastic type.
GB/T 7948-2024 - *Plain Bearings: Plastic Bushings - Test Method for Limiting PV Value*
Replacing the 1987 edition, this standard prescribes the test method for determining the limiting PV value of plastic bushings under conditions of dry friction or boundary lubrication. It is applicable for evaluating the wear resistance and load-bearing performance of coiled plastic components under rotational or sliding operating conditions.
As a fundamental material widely utilized across sectors such as packaging, electronics, textiles, and construction, plastic spools currently lack a unified national-level industry standard that encompasses the entire product category.
The production of plastic spools must adhere to relevant industry standards-such as the ISO 9001 Quality Management System-to ensure product quality and safety.
