1. Visual Inspection
Head Fit: The hexagonal head should fit snugly against the mounting surface, without any skew or warping.
Thread Cleanliness: The threads should be free of stains or damage. Stubborn stains may affect installation quality.
2. Tightening Verification
Torque Standard: Use a torque wrench to check that the specified torque is met to avoid overtightening or loosening.
Tool Selection: Prefer a hexagonal wrench or socket to ensure uniform force distribution.
3. Positioning and Fit
Hole Alignment: The bolt should be fully inserted into the hole, with no signs of force.
Component Fit: There should be no interference with other components (such as washers and nuts), and the threads should engage smoothly.
4. Special Scenario Requirements
High-strength bolts: The standard initial, re-tightening, and final tightening procedures must be followed. After final tightening, check to see if the hexagonal head is broken or if the markings are clear. Surface Treatment: If galvanized or Dacromet-coated, ensure the coating is intact and meets rust resistance standards.
5. Standard Reference
Dimensional Specifications: Check thread specifications, lengths, and other parameters against standards such as GB/T 5782-2000 to ensure they meet requirements.
