JB/T 58651.2-1999
Fastener Product Quality Grading - Bolts
紧固件产品质量分等 螺栓
Catalogue
前言 → 1 范围 → 2 引用标准 → 3 名词、术语及计算公式 → 4 抽查项目、抽样方案、缺陷等级及加权值 → 5 分等标准 → 6 检验方法 Foreword → 1 Scope → 2 Normative References → 3 Terms, Definitions and Calculation Formulas → 4 Inspection Items, Sampling Plan, Defect Grades and Weighted Values → 5 Grading Standard → 6 Inspection Methods
Scope
This standard specifies the principles and methods for quality grading of bolt-type products manufactured according to national standards and industry standards. It may also be used as a reference for quality grading of bolt-type products manufactured according to other standards. This standard adopts three grades: superior product, first-grade product, and qualified product. This standard applies to single-specification product batches accepted in accordance with GB 90. The dimensional symbols used in this standard are consistent with current bolt standards.
本标准规定了按国家标准及行业标准生产的螺栓类产品质量分等的原则和方法。按其他标准生产的螺栓类产品进行质量分等时亦可参照使用。本标准采用三级分等，即优等品、一等品、合格品。本标准适用于按GB 90 接收了的单一规格产品批。本标准中使用的尺寸代号，均与现行螺栓标准一致。
Normative References
Keywords
Application Summary AI generated
Bolt manufacturers and quality inspection departments use this standard to classify bolt products into quality grades. By defining defect grades and weighted values, combined with sampling plans, products are categorized as superior, first-grade, or qualified. This standard provides a unified basis for bolt quality assessment, helping to improve product quality and industry standardization.
螺栓生产企业和质量检验部门使用该标准，对螺栓产品进行质量等级划分。通过确定缺陷等级和加权值，结合抽样方案，将产品分为优等品、一等品和合格品。该标准为螺栓质量评估提供了统一依据，有助于提升产品质量和行业规范化水平。
AI Summary AI generated
This standard specifies the principles and methods for quality grading of bolt-type products, adopting three grades (superior, first-grade, qualified), and applies to single-specification product batches accepted per GB 90. It details inspection items, sampling plans, defect grades, and weighted values, along with inspection methods and grading criteria. Using defect weighted values and unit defect score formulas, it enables quantitative assessment for scientific and consistent quality grading.
本标准规定了螺栓类产品的质量分等原则和方法，采用三级分等（优等品、一等品、合格品），适用于按GB 90接收的单一规格产品批。标准详细列出了抽查项目、抽样方案、缺陷等级及加权值，并给出了检验方法和分等标准。通过缺陷加权值和单位缺陷分计算公式，对产品进行量化评估，确保质量分等的科学性和一致性。
Key Sentences extracted from text
本标准规定了按国家标准及行业标准生产的螺栓类产品质量分等的原则和方法。
本标准采用三级分等，即优等品、一等品、合格品。
本标准适用于按GB 90 接收了的单一规格产品批。
缺陷等级、缺陷加权值和单位缺陷分标准的定义以及单位缺陷分计算公式按JB/T 58651.1 规定。
螺栓产品的质量分等标准按表2 规定。
This standard specifies the principles and methods for quality grading of bolt-type products manufactured according to national standards and industry standards.
This standard adopts three grades: superior product, first-grade product, and qualified product.
This standard applies to single-specification product batches accepted in accordance with GB 90.
The definitions of defect grades, defect weighted values, and unit defect score standards, as well as the calculation formula for unit defect score, are specified in JB/T 58651.1.
The quality grading standard for bolt products is specified in Table 2.
Standard Timeline
Changes from replaced version:
- 对原标准进行了编辑性的修改，主要技术内容没有变化
- Editorial modifications were made to the original standard, with no changes to the main technical content.