JB/T 58651.4-1999
Fastener Product Quality Grading - Nuts
紧固件产品质量分等 螺母
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 Standards → 6 Inspection Methods
Scope
This standard specifies the principles and methods for quality grading of nut products manufactured according to national standards and industry standards. It may also be used as a reference for quality grading of nut products manufactured according to other standards. This standard adopts three grades: superior product, first-grade product, and qualified product. This standard is applicable to batches of single specification products accepted according to GB/T 90. The dimensional symbols used in this standard are consistent with the current nut standards.
本标准规定了按国家标准及行业标准生产的螺母类产品质量分等的原则和方法。按其他标准生产的螺母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/T 90 接收了的单一规格产品批。本标准中使用的尺寸代号，均与现行螺母标准一致。
Normative References
Keywords
Application Summary AI generated
Nut manufacturers and quality inspection departments use this standard to evaluate the quality grade of nut products. The three-tier grading system (superior, first-grade, qualified) helps manufacturers control product quality and ensure compliance with national and industry standards. This standard is important for improving the overall quality level of the fastener industry and regulating market order.
螺母生产企业和质量检验部门使用该标准，对螺母产品进行质量等级评定。通过三级分等体系（优等品、一等品、合格品），帮助制造商控制产品质量，确保产品符合国家标准和行业要求。该标准对于提升紧固件行业整体质量水平、规范市场秩序具有重要意义。
AI Summary AI generated
This standard specifies the principles and methods for quality grading of nut products, adopting a three-tier system of superior, first-grade, and qualified products. It applies to batches of single specification products accepted according to GB/T 90. The standard details inspection items, sampling plans, defect grades and weighted values, and provides grading standards and inspection methods. It references multiple related standards covering thread gauges, calipers, mechanical properties, etc. This standard provides a unified technical basis for quality control of nut products.
本标准规定了螺母类产品的质量分等原则和方法，采用优等品、一等品、合格品三级分等体系。适用于按GB/T 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，并给出了分等标准和检验方法。引用多项相关标准，涵盖螺纹量规、卡尺、机械性能等要求。该标准为螺母产品质量控制提供了统一的技术依据。
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母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/T 90 接收了的单一规格产品批。
本标准中使用的尺寸代号，均与现行螺母标准一致。
螺母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 nut products manufactured according to national standards and industry standards.
This standard adopts three grades: superior product, first-grade product, and qualified product.
This standard is applicable to batches of single specification products accepted according to GB/T 90.
The dimensional symbols used in this standard are consistent with the current nut standards.
The quality grading standards for nut products are 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
- The main technical content has not changed