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• 1. What is a hex bolt with hole (DIN 931)?

  A hex bolt with a hole is a standard hex head bolt that includes a hole drilled through its body or head. This hole allows for the insertion of a wire or pin, commonly used to secure the bolt or prevent it from loosening. It follows the DIN 931 standard for partially threaded bolts.

• 2. What is the purpose of the hole in a hex bolt?

  The hole in a hex bolt is typically used to insert a locking wire or pin, which helps prevent the bolt from loosening due to vibration or rotation. This feature is crucial in applications where bolt security and safety are paramount.

• 3. Where are hex bolts with holes commonly used?

  Hex bolts with holes are commonly used in industries such as aerospace, automotive, machinery, and construction, where vibration is common and bolt security is essential. They are also used in critical safety applications like securing machinery parts and heavy equipment.

• 4. Can a hex bolt with a hole be reused?

  Yes, hex bolts with holes can generally be reused, provided they are not damaged or subjected to excessive wear. However, the locking wire or pin should be inspected or replaced to ensure proper security during reuse.

• 5. Are hex bolts with hole (DIN 976) available in different grades?

  Yes, hex bolts with hole (DIN 976) come in various grades, which indicate their tensile strength and material properties. Common grades include 8.8, 10.9, and 12.9, with higher numbers representing stronger bolts. Choose the grade based on the strength requirements of your application.