Fastener standards are essential for ensuring the quality, compatibility, and performance of threaded and non-threaded fastening components. These standards cover a wide range of specifications, from basic dimensions to advanced mechanical properties and surface treatments.
1. Standards for fastener product size: This includes defining the fundamental dimensions of the fastener, such as the thread diameter, pitch, length, and other critical features like shoulder distance, undercut, chamfer, and end size for external threads. These specifications ensure that fasteners fit properly and function as intended in their applications.
2. Technical conditions for fastener products: These standards outline various requirements that fasteners must meet. They include:
a) Tolerance standards: Define acceptable dimensional and shape tolerances to ensure consistency and interchangeability between parts.
b) Mechanical property standards: Specify the marking system for performance grades and the required mechanical characteristics, such as tensile strength, hardness, and yield strength. In some cases, these standards may also relate to material properties or functional performance.
c) Surface defect standards: Describe the types of surface imperfections allowed and the criteria for acceptable appearance.
d) Surface treatment standards: Outline the types of coatings, plating, or finishes that can be applied and the specific requirements for each type.
e) Testing standards: Detail the procedures for testing mechanical, physical, and functional properties to ensure compliance with the required standards.
3. Acceptance inspection, marking, and packaging standards: These define the procedures for inspecting and accepting fasteners, including sampling plans, quality levels, marking methods, and packaging requirements to protect the product during transport and storage.
4. Marking standards: Provide guidelines on how to fully or partially mark fasteners with relevant information such as material grade, manufacturer details, and size specifications.
5. Additional standards: Cover areas such as terminology, weight calculations, and other technical aspects related to fastener design and application.
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