JB/T 53330-1999

Manufacturers of powder metallurgy bearings and quality inspection departments use this standard to assess the quality grade of iron-based oil-impregnated bearings. It helps enterprises in product upgrading, excellence creation, and quality evaluation, and provides a basis for pricing high-quality products. By defining three quality levels (qualified, first-class, and superior), the standard ensures product consistency and reliability.

粉末冶金轴承生产企业和质量检验部门使用本标准，对铁基含油轴承进行质量等级评定。它帮助企业进行产品升级、创优和考核，同时为优质优价提供依据。该标准通过划分合格品、一等品和优等品，确保产品质量的稳定性和可靠性。

This standard specifies the quality grading requirements for powder metallurgy iron-based oil-impregnated bearings (cylindrical and flanged cylindrical), classifying products into three grades: qualified, first-class, and superior. It details indicators for key items (e.g., radial crushing strength), major items (e.g., hardness, oil content), and general items (e.g., surface roughness), along with corresponding test methods (e.g., oil-impregnated density measurement, crushing strength test) and quality assessment procedures (including sampling methods and pass rate requirements). The standard is intended for enterprise upgrading, excellence creation, and quality inspection, and can also serve as a basis for high-quality pricing.

本标准规定了粉末冶金铁基含油轴承（筒形及带挡边筒形）的产品质量分等要求，将产品分为合格品、一等品和优等品三个等级。标准详细列出了关键项目（如径向压溃强度）、主要项目（如硬度、含油率）和一般项目（如表面粗糙度）的指标，并规定了相应的试验方法（如含油密度测定、压溃强度测试）和质量评定程序（包括抽样方法和合格率要求）。该标准适用于企业升级、创优和质量考核，也可作为优质优价的依据。