Fastener Testing Equipment The testing process of fasteners usually includes the following steps: ‌1. Appearance inspection‌: Ensure that its surface is smooth and free of defects such as burrs, scratches, rust, etc. At the same time, check whether the fastener identification is clear, including manufacturer logo, performance grade, material identification, etc. ‌. ‌2. Dimension measurement‌: Use measuring tools (such as vernier calipers, micrometer screws, etc.) to measure the various dimension